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Case Study and Passage Based Questions for Class 10 Science Chapter 10 Light Reflection and Refraction

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Here, we have provided case based/passage based questions for Class 10 Science Chapter 10 Light Reflection and Refraction .

Question 1:

Read the following and answer any four questions from (i) to (v).

A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole. the image formed is virtual and erect.

A convex mirror always forms a virtual, erect and diminished image. A concave mirror is used as doctor’s head mirror to focus light on body parts like eyes, ears, nose etc., to be examined because it can form erect and magnified image of the object. The convex mirror is used as a rear view mirrors in automobiles because it can form an small and erect image of an object.

(i) When an object is placed at the centre of curvature of a concave mirror, the image formed is (a) larger than the object (b) smaller than the object (c) same size as that of the object (d) highly enlarged.

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be (a) plane (b) concave (c) convex (d) either plane or convex.

(iii) A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top. (a) Plane, convex and concave (b) Convex, concave and plane (c) Concave, plane and convex (d) Convex, plane and concave

(v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen. (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

Question 2:

The lenses forms different types of images when object placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.

When a ray goes through the optical centre of the lens, it passes without any deviation. If the object is placed between focus and optical center of the convex lens, erect and magnified image is formed.

As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also the size of image goes on increasing and the image is always real and inverted.

A concave lens always gives a virtual, erect and diminished image irrespective to the position of the object.

(i) The location of image formed by a convex lens when the object is placed at infinity is (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

(ii) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b) virtual and inverted (c) virtual and smaller (d) real and erect

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is (a) small (b) point in size (c) highly magnified (d) same as that of object

(iv) When the object is placed at 2F in front of convex lens, the location of image is (a) at F (b) at 2 F on the other side (c) at infinity (d) between F and optical center

(v) At which location of object in front of concave lens, the image between focus and optical centre is formed (a) anywhere between centre and infinity (b) at F (c) at 2F (d) infinity

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Case Study Questions Class 10 Science Light Reflection and Refraction

Case study questions class 10 science chapter 10 light reflection and refraction.

$Light Reflection and Refraction Case Study Questions and answers$

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

Case study:1

We can see when the pencil immersed in water it appears like bent at the water air interface. Also, the letters appears to be raised when we will see that letters through a glass slab placed over it. If the media used are different that means the bending of light is different in different media. And hence we can say that the light does not travel along a straight line path through different media. According to the velocity of light in that medium the bending of light takes place. Thus, we can say the phenomenon in which light ray bends or changes its direction when traveling from one medium to other is called as refraction of light. And also we can observed that if the ray of light is traveling from rarer medium to denser medium it bends towards the normal whereas when the ray of light travels from denser medium to rarer medium it bends away from the normal. And the extent of bending of light in a particular medium depends on the refractive index of the medium mostly. More the refractive index more is the bending or denser is the medium and less will be the velocity of light in that medium.

If less is the refractive index then less will be the bending or medium is rarer and velocity of light will be more in that medium. Like the refractive index of air is found to be 1.0003 and that of water is found to be 1.33. And hence water is more denser than air, air is rarer medium as compared to water. Thus, velocity of light in air medium is greater than velocity of light in water medium.

The absolute refractive index of the medium is given by

Absolute Refractive index= (speed of light in air)/(speed of light in medium) = c/v

Thus, for different media refractive index is different and accordingly the velocity of light is also different.

1) If the refractive indices of glass and ice are 1.52 and 1.31 respectively. Then in which medium the velocity of light is more? What it’s value?

( Velocity of light in air= 3*108 m/s)

2) How you can define rarer and denser medium on the basis of optical density?

3) If the Refractive index of diamond is found to be highest i.e. 2.42 then what it indicates?

4) What will happen if we took a glass filled with kerosene instead of water? What would be the observations?

Case study: 2

We have, the object distance is the distance of the object from the pole of the mirror. And we always know that object is placed in front of mirror that means on left side and hence object distance u is always taken as negative. The distance of the image from the pole of the mirror is taken as image distance. The image distance may be positive or negative on the basis of nature of image formed. And the distance of principal focus from the pole is called as focal length of the mirror. Thus, the relationship between the object distance u, image distance v and focal length f is given by mirror formula.

Mirror formula:

1/v + 1/u = 1/f

And magnification in case of mirror gives the extent to which the image is magnified as compared to object size. Magnification is given by the ratio of height of image (h’) to the height of object (h).

Thus, magnification = (height of image)/(height of object)

Thus, m = h’/h

Also, in terms of object distance and image distance magnification is given by,

Magnification m = h’/h = -v/u

As we know that, image height is positive if the image formed is virtual while height of image is negative for real images.

Similarly in case of lenses, lens formula is given by

1/v – 1/u = 1/f

And magnification in case of lenses is given by

Magnification m = h’/h = v/u

The power of lens depends on the focal length of the lens and it is the ability of the lens to diverge or converge the number of rays incident on it. Also, power of lens is defined as the reciprocal of focal length of the lens.

Thus, P = 1/f

Questions :

1) If the focal length of the lens is measured in meter what will be the unit of power of lens?

2) What is the sign of power of convex and concave lens?

3) If the lenses placed in contact of powers P1, P2, P3, P4 are used then what is the net power of lens system?

4) If the magnification produced is negative and positive in case of mirrors then what about the nature of images formed there?

1) If the focal length of the lens is used in meter then the power of the lens is measured in dioptre or D or m-1.

2) As the focal length of convex lens is positive and hence the power of convex lens is positive.

Also, as the focal length of concave lens is negative and hence the power of concave lens is negative.

3) If in a lens system four lenses of power P1, P2, P3 and P4 are in contact then net power of lens system is the algebraic sum of given power of lenses.

P= P1 + P2 + P3 + P4

4) If the magnification produced is negative then the image formed is real. And if the magnification produced is positive then the image formed is virtual.

Case study:3

As we know that, in case of concave mirrors when a ray of light parallel to principal axis strikes the mirror and after reflection it passes through principal focus of the concave mirror. Also, a ray which is passing through the principal focus of the concave mirror after reflection goes parallel to the principal axis. And the ray of light which is passing through the centre of curvature of concave mirror after reflection retraces the same path in backward direction. Because of converging property of concave mirrors they are used in solar furnaces to concentrate more light to produce huge amount of heat energy. They are also used in search lights, torches, head lights of vehicles so that a strong parallel beam of light will be produced. Also, in case of shaving mirrors concave mirrors are used to see larger face of the person.

While convex mirrors are used as rear view mirror in vehicles to see the traffic behind the person for safe driving. As these mirrors are curved outwards they has wider field of view. In convex mirrors the image formed is always diminished, virtual and erect.

In concave mirror, when the object is at infinity the image formed will be at focus F and which is highly diminished, point sized, real and inverted.

1) In case of concave mirror when the image formed is virtual and erect?

2) In which case the image formed is of same size as the object in case of concave mirrors?

3) Which mirrors are called as converging and diverging mirror?

4) The focal length of concave mirror is______ and the focal length of convex mirror is _______.

1) In case of concave mirrors, when the object is placed between pole P and focus F of the mirror then the image formed is behind the mirror which is enlarged, virtual and erect.

2) When the object is placed at centre of curvature C of the mirror then image formed is also at centre of curvature C which is of same size, real and inverted.

3) Concave mirror is called as converging mirror while convex mirror is called as diverging mirror.

4) The focal length of concave mirror is positive and the focal length of convex mirror is negative.

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Answer for the 4th question of the last case study is wrong

It is +ve for convex mirror and -ve for concave mirror

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Case Study Chapter 10 Light Reflection and Refraction

Please refer to Chapter 1 Light Reflection and Refraction Case Study Questions with answers provided below. We have provided Case Study Questions for Class 10 Science for all chapters as per CBSE, NCERT and KVS examination guidelines. These case based questions are expected to come in your exams this year. Please practise these case study based Class 10 Science Questions and answers to get more marks in examinations.

Case Study Questions Chapter 1 Light Reflection and Refraction

Case/Passage – 1 A 5.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm.

Question: What is the power of the used lens? (a) + 5 D (b) – 5 D (c) + 0.5 D (d) – 0.5 D

Question: What is the distance of image from the pole of lens? (a) v = 60 cm (b) v = – 60 cm (c) v = 30 cm (d) v = –30 cm

Case/Passage – 2

Light travels through a vacuum at a speed c = 3 × 108 m/s. It can also travel through many materials, such as air, water and glass. Atoms in the material absorb, reemit and scatter the light, however. Therefore, light travels through the material at a speed that is less than c, the actual speed depending on the nature of the material. To describe the extent to which the speed of light in a material medium differs from that in a vacuum, we use a parameter called the index of refraction (or refractive index).

Question: Figure shows a ray of light as it travels from medium A to

$Case StuCase Study Chapter 10 Light Reflection and Refractiondy Chapter 10 Light Reflection and Refraction$

medium B. Retractive index of the medium B relative to medium A is (a) √3/2 (b)√2/3 (c)√1/2 (d) √2

Question:The path of a ray of light coming from air passing through a rectangular glass slab traced by four students shown as A, B, C and D in the figure. Which one of them is correct?

$Case Study Chapter 10 Light Reflection and Refraction$

(a) A (b) B (c) C (d) D

Question: A light ray enters from medium A to medium B as shown

$Case Study Chapter 10 Light Reflection and Refraction$

in the figure. The refractive index of medium B relative to A will be (a) greater than unity (b) less than unity (c) equal to unity (d) zero

Question: You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at same angle would bend the most? (a) Kerosene (b) Water (c) Mustard oil (d) Glycerine

Question: A ray of light is incident in medium 1 on a surface that separates medium 1 from medium 2. Let v1 and v2 represent the velocity of light in medium 1 and medium 2 respectively. Also let n12 and n21 represent the refractive index of medium 1 with respect to medium 2 and refractive index of medium 2 with respect to medium 1, respectively. If i and r denote the angle of incidence and angle of refraction, then- (a) sin i/sin r = n 21 V 1 /V 2 (b) sin i/sin r = n 21 V 2 /V 1 (c) sin i/sin r = n 12 V 1 /V 2 (d) sin i/sin r = n 12 V 2 /V 1

Case/Passage – 3 Inside a substance such as glass or water, light travels more slowly than it does in a vacuum. If c denotes the speed of light in a vacuum and v denotes its speed through some other substance, then v = c/n where n is a constant called the index of refraction. To good approximation, a substance’s index of refraction does not depend on the wavelength of light. For instance, when red and blue light waves enter water, they both slow down by about the same amount. More precise measurements, however, reveal that n varies with wavelength. Table presents some indices of refraction of Custon glass, for different wavelengths of visible light. A nanometer (nm) is 10– 9 meters. In a vacuum, light travels as c = 3.0 × 10 8 m/s

$Case Study Chapter 10 Light Reflection and Refraction$

Question: Inside Custon glass (a) Orange light travels faster than yellow light (b) Yellow light travels faster than orange light (c) Orange and Yellow light travels equally fast (d) We cannot determine which color of light travels faster

Question: Which of the following phenomena happens because n varies with wavelength (a) A lens focuses light (b) A prism breaks sunlight into different colors (c) Total internal reflections ensures that light travels down a fiber optic cable (d) Light rays entering a pond change direction at the pond’s surface

Question: For blue-green of wavelength 520 nm, the index of refraction of Custon glass is probably closest to (a) 1.49 (b) 1.50 (c) 1.51 (d) 1.52

$Case Study Chapter 10 Light Reflection and Refraction$

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Light Reflection and Refraction Case Study Based Questions Class 10

Students who are studying in CBSE class 10 board, need to get the knowledge about the Light Reflection and Refraction Case Study Based Questions. Case based questions are generally based on the seen passages from the chapter Light Reflection and Refraction. Through solving the case based questions, students can understand each and every concept.

With the help of Light Reflection and Refraction Case Study Based Questions, students don’t need to memorise each answer. As answers for these case studies are already available in the given passage. Questions are asked through MCQs so student’s won’t take time to mark the answers. These multiple choice questions can help students to score the weightage of Light Reflection and Refraction.

Light Reflection and Refraction Case Study Based Questions with Solutions

Selfstudys provides case studies for the Class 10 Science chapter Light Reflection and Refraction with solutions. The Solutions can be helpful for students to refer to if there is a doubt in any of the case studies problems. The solutions from the Selfstudys website are easily accessible and free of cost to download. This accessibility can help students to download case studies from anywhere with the help of the Internet.

Light Reflection and Refraction Case Study Based Questions with solutions are in the form of PDF. Portable Document Format (PDF) can be downloaded through any of the devices: smart phone, laptop. Through this accessibility, students don't need to carry those case based questions everywhere.

Features of Light Reflection and Refraction Case Study Based Questions

Before solving questions, students should understand the basic details of Light Reflection and Refraction. Here are the features of case based questions on Light Reflection and Refraction are:

These case based questions start with short or long passages. In these passages some concepts included in the chapter can be explained.
After reading the passage, students need to answer the given questions. These questions are asked in the Multiple Choice Questions (MCQ).
These case based questions are a type of open book test. These case based questions can help students to score well in the particular subject.
These Light Reflection and Refraction Case Study Based Questions can also be asked in the form of CBSE Assertion and Reason .

Benefits of Solving Light Reflection and Refraction Case Study Based Questions

According to the CBSE board, some part of the questions are asked in the board exam question papers according to the case studies. As some benefits of solving Light Reflection and Refraction Case Study Based Questions can be obtained by the students. Those benefits are:

Through solving case studies students will be able to understand every concept included in the chapter Light Reflection and Refraction
Passages included in the case study are seen passages, so students don’t need to struggle for getting answers. As these questions and answers can be discussed by their concerned teacher.
Through these students can develop their observation skills. This skill can help students to study further concepts clearly.
Case studies covers all the concepts which are included in the Light Reflection and Refraction

How to Download Light Reflection and Refraction Case Based Questions?

Students studying in CBSE class 10 board, need to solve questions based on case study. It is necessary for students to know the basic idea of Light Reflection and Refraction Case Study Based Questions. Students can obtain the basic idea of case based questions through Selfstudys website. Easy steps to download it are:

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Tips to solve Light Reflection and Refraction Case Study Questions-

Students should follow some basic tips to solve Light Reflection and Refraction Case Study Based Questions. These tips can help students to score good marks in CBSE Class 10 Science.

Generally, the case based questions are in the form of Multiple Choice Questions (MCQs).
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Identify the questions and give the answers according to the case given.
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CBSE 10th Standard Science Subject Light Reflection and Refraction Chapter Case Study Questions With Solution 2021

By QB365 on 21 May, 2021

QB365 Provides the updated CASE Study Questions for Class 10 , and also provide the detail solution for each and every case study questions . Case study questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

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Cbse 10th standard science subject light reflection and refraction case study questions with solution 2021.

10th Standard CBSE

Final Semester - June 2015

The curved surface of a spoon can be considered as a spherical mirror. A highly smooth polished surface is called mirror. The mirror whose reflecting surface is curved inwards or outwards is called a spherical mirror. Inner part works as a concave mirror and the outer bulging part acts as a convex mirror. The center of the reflecting surface of a mirror is called pole and the radius of the sphere of which the mirror is formed is called radius of curvature. (i) When a concave mirror is held towards the sun and its sharp image is formed on a piece of carbon paper for some time, a hole is burnt in the carbon paper. What is the name given to the distance between the mirror and carbon paper?

(ii) The distance between pole and focal point of a spherical mirror is equal to the distance between

(iii) The focal length of a mirror is 15 cm. The radius of curvature is

(iv) The normal at any point on the mirror passes through

(v) In a convex spherical mirror, reflection of light takes place at

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on screen, the image is real and when the image does not form on screen, the image is virtual. When the two reflected rays meet actually, the image is real and when they appear to meet, the image is virtual. A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole, the image formed is virtual and erect. A convex mirror always forms a virtual, erect and diminished image. A concave mirror is used as doctor's head mirror to focus light on body parts like eyes, ears, nose etc., to be examined because it can form erect and magnified image of the object. The convex mirror is used as a rear view mirrors in automobiles because it can form an small and erect image of an object. (i) When an object is placed at the centre of curvature of a concave mirror, the image formed is

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

(iv) To get an image larger than the object, one can use (a) convex mirror but not a concave mirror (b) a concave mirror but not a convex mirror (c) either a convex mirror or a concave mirror (d) a plane mirror. (v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

The relation between distance of an object from the mirror (u), distance of image from the mirror (v) and the focal length (F) is called mirror formula. This formula is valid in all situations for all spherical mirrors for all positions of the object. The size of image formed by a spherical mirror depends on the position of the object from the mirror. The image formed by a spherical mirror can be bigger than the object, equal to the object or smaller than the object. The size of the image relative to the object is given by the linear magnification (m). Thus, the magnification is given by the ratio of height of image to the height of object. If magnification is negative, image is real and if it is positive, image is virtual. (i) What is the position of an image when an object is placed at a distance of 20 em from a concave mirror of focal length 20 cm?

(iii) If the magnification of an image is -2, the characteristic of image will be

(iv) The mirror formula holds for

(v) A parallel beam of light is made to fall on a concave mirror. An image is formed at a distance of7.5 from the mirror. The focal length of the mirror is

(ii) A ray of light passes from a medium A to another medium B. No bending of light occurs if the ray of light hits the boundary of medium B at an angle of

(iii) When light passes from one medium to another, the frequency of light

(iv) When light passes from glass to water, the speed of light

(v) The bottom of pool filled with water appears to be ______ due to refraction of light

*****************************************

Cbse 10th standard science subject light reflection and refraction case study questions with solution 2021 answer keys.

(i) (d) : When an object is placed at the focus of a concave mirror, the..image is formed at infinity. (ii) (d) : When a light ray parallel to the principal axis is incident on a concave mirror, it passes through the principal focus after reflection. Therefore, figure D is correct. (iii) (a) : If m is negative, the image will be real and inverted. (iv) (d) (v) (b): The distance of object from mirror = $\infty$ Using, $\frac{1}{v}+\frac{1}{u}=\frac{1}{f}$ $\frac{1}{\infty}-\left(-\frac{1}{7.5}\right)=\frac{1}{f}$ f = 7.5 cm

(i) (a): When, a ray of light travels from air to glass, it bends towards the normal. (ii) (c): No bending of light occurs when light is incident normally or perpendicularly on a boundary of two media since angle of incidence and angle of refraction both are zero. (iii) (c): When light goes from one medium to other medium, its frequency does not change (iv) (a): The speed to light increases when light passes from glass to water as water is optically rarer medium. (v) (a): The bottom of a pool of water appears to be less deep than it actually is due to refraction.

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Class 10 Science: Case Study Chapter 10 Light Reflection and Refraction PDF Download

In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given.

Here we are providing you with Class 10 Science Chapter 10 Light Reflection and Refraction Case Study Questions, by practicing these Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 10 Light Reflection and Refraction

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 10 Light Reflection and Refraction

Case Study/Passage-Based Questions

Question 1:

The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on the screen, the image is real and when the image does not form on-screen, the image is virtual. When the two reflected rays meet actually, the image is real and when they appear to meet, the image is virtual. A concave mirror always forms a real and inverted image for different positions of the object. But if the object is placed between the focus and pole, the image formed is virtual and erect. A convex mirror always forms a virtual, erect, and diminished image. A concave mirror is used as a doctor’s head mirror to focus light on body parts like eyes, ears, nose, etc., to be examined because it can form erect and magnified images of the object. The convex mirror is used as a rear view mirror in automobiles because it can form a small and erect image of an object.

(i) When an object is placed at the center of curvature of a concave mirror, the image formed is

Answer: (c) same size as that of the object

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

Answer: (d): The image is erect in a plane mirror and also in a convex mirror, for all positions of the object.

Answer: (c) : As the image of head is bigger, the upper portion of magic mirror is concave. The middle portion of the image is of same size, so, middle portion of magic mirror is plane. Now, the image of legs looks smaller, therefore, the lower portion of magic mirror is convex.

Answer: (b) a concave mirror but not a convex mirror

(v) A convex mirror has wider field of view because (a) the image formed is much smaller than the object and large number of images can be seen (b) the image formed is much closer to the mirror (c) both (a) and (b) (d) none of these.

Answer: (c) both (a) and (b)

Question 2:

The lenses form different types of images when objects are placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.

When a ray goes through the optical center of the lens, it passes without any deviation. If the object is placed between the focus and the optical center of the convex lens, an erect and magnified image is formed.

As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also, the size of the image goes on increasing and the image is always real and inverted.

A concave lens always gives a virtual, erect, and diminished image irrespective of the position of the object.

(i) The location of image formed by a convex lens when the object is placed at infinity is (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

Answer: (a) at focus

(ii) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b) virtual and inverted (c) virtual and smaller (d) real and erect

Answer: (b) virtual and inverted

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is (a) small (b) point in size (c) highly magnified (d) same as that of object

Answer: (c) highly magnified

(iv) When the object is placed at 2F in front of convex lens, the location of image is (a) at F (b) at 2 F on the other side (c) at infinity (d) between F and optical center

Answer: (b) at 2 F on the other side

(v) At which location of object in front of concave lens, the image between focus and optical centre is formed (a) anywhere between centre and infinity (b) at F (c) at 2F (d) infinity

Answer: (a) anywhere between centre and infinity

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Case Study Questions Class 10 Science Chapter 10 Light Reflection and Refraction

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CBSE Board Exam is on the way, so you must practice some good Case Study Questions Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams .

Join our Telegram Channel, there you will get various e-books for CBSE 2024 Boards exams for Class 9th, 10th, 11th, and 12th.

In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Re a son . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Light Reflection and Refraction Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 10 Light Reflection and Refraction

Case Study/Passage-Based Questions

Question 1:

(i) When an object is placed at the center of curvature of a concave mirror, the image formed is

Answer: (c) same size as that of the object

(ii) No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

Answer: (d): The image is erect in a plane mirror and also in a convex mirror, for all positions of the object.

Answer: (b) a concave mirror but not a convex mirror

Answer: (c) both (a) and (b)

Question 2:

A concave lens always gives a virtual, erect, and diminished image irrespective of the position of the object.

(i) The location of image formed by a convex lens when the object is placed at infinity is (a) at focus (b) at 2F (c) at optical center (d) between Fand 2F

Answer: (a) at focus

(ii) When the object is placed at the focus of concave lens, the image formed is (a) real and smaller (b) virtual and inverted (c) virtual and smaller (d) real and erect

Answer: (b) virtual and inverted

(iii) The size of image formed by a convex lens when the object is placed at the focus of convex lens is (a) small (b) point in size (c) highly magnified (d) same as that of object

Answer: (c) highly magnified

(iv) When the object is placed at 2F in front of convex lens, the location of image is (a) at F (b) at 2 F on the other side (c) at infinity (d) between F and optical center

Answer: (b) at 2 F on the other side

(v) At which location of object in front of concave lens, the image between focus and optical centre is formed (a) anywhere between centre and infinity (b) at F (c) at 2F (d) infinity

Answer: (a) anywhere between centre and infinity

Case Study 3: Light reflection and refraction are fundamental phenomena that occur when light interacts with surfaces and passes through different mediums. Reflection is the bouncing back of light when it strikes a surface. The laws of reflection state that the angle of incidence is equal to the angle of reflection, and the incident ray, reflected ray, and normal at the point of incidence lie in the same plane. Refraction, on the other hand, is the bending of light as it passes from one medium to another with a different optical density. The bending of light is governed by Snell’s law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a given pair of media. The concepts of reflection and refraction help us understand various optical phenomena, such as the formation of images by mirrors and lenses, the dispersion of light, and the phenomenon of total internal reflection.

What is reflection? a) The bending of light as it passes from one medium to another b) The bouncing back of light when it strikes a surface c) The formation of images by mirrors and lenses d) The dispersion of light Answer: b) The bouncing back of light when it strikes a surface

What do the laws of reflection state? a) The angle of incidence is equal to the angle of reflection b) The incident ray, reflected ray, and normal lie in the same plane c) The angle of incidence, angle of reflection, and normal form a right triangle d) All of the above Answer: d) All of the above

What is refraction? a) The bending of light as it passes from one medium to another b) The bouncing back of light when it strikes a surface c) The formation of images by mirrors and lenses d) The dispersion of light Answer: a) The bending of light as it passes from one medium to another

What law governs the bending of light during refraction? a) Law of reflection b) Snell’s law c) Newton’s law d) Coulomb’s law Answer: b) Snell’s law

What optical phenomena can be explained using the concepts of reflection and refraction? a) Formation of images by mirrors and lenses b) Dispersion of light c) Total internal reflection d) All of the above Answer: d) All of the above

Hope the information shed above regarding Case Study and Passage Based Questions for Class 10 Science Chapter 10 Light Reflection and Refraction with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 10 Science Light Reflection and Refraction Case Study and Passage Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible. By Team Study Rate

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CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction 2024-25

CBSE Class 10 Science Chapter-10 Important Questions with Answers - Free PDF Download

The concept of light, reflection, and refraction is quite fascinating for the students of Class 10. In the previous classes, students have learned a lot of new things related to these two natural phenomena occurring with light. In Class 10, they will advance to a new level of concepts related to reflection and refraction. The textbook explains the concepts pretty well. Students will need more Light Reflection and Refraction Class 10 Important Questions with answers to prepare for the exams.

By studying the Class 10 Science Chapter 10 Important Questions, you will develop your concept for this chapter in a better way. In fact, your answering skills will also increase considerably. Check out how the expert teachers at Vedantu have answered the Light Class 10 Important Questions niftily. Download the PDF and follow the format of answering questions as shown by the experts to score more. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions, they can download Class 10 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

Download CBSE Class 10 Science Important Questions 2024-25 PDF

Also, check CBSE Class 10 Science Important Questions for other chapters:

Related Chapters

Important Topics under CBSE Class 10 Science Chapter 10 - Light Reflection and Refraction

The following list of important topics covered under the chapter on Light Reflection and Refraction has been provided for students so that they can take a glance at the major concepts and read them through before diving into the important questions.

Reflection of Light

Spherical Mirrors

Image Formation by Spherical Mirrors

Sign Convention for Spherical Mirrors

Mirror Formula and Magnification

Refraction of Light

Refraction through a Rectangular Glass Slab

Refractive Index

Refraction by Spherical Lenses

Image Formation by Lenses and Their Ray Diagrams

Sign Convention for Spherical Lenses

Lens Formula and Magnification

Power of a Lens

Study Important Questions for Class 10 Science Chapter 10 - Light Reflection and Refraction

Long Answer Questions (5 Marks)

1. A convex lens has a focal length of \[10\] cm. At what distance from the lens should the object be placed so that it forms a real and inverted image $20$ cm. away from the lens? What would be the size of the image formed if the object is $2$ cm high? With the help of a ray, the diagram shows the formation of the image by the lens in this case?

Ans: Given, the focal length of the convex lens,

$\Rightarrow f=+10$ cm

Also, given the image formed is real and inverted with the image distance as $20$ cm.

$\Rightarrow v=+20$ cm

From the lens formula, we have:

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{10}=\dfrac{1}{20}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{u}=\dfrac{1}{20}-\dfrac{1}{10}$

$\Rightarrow \dfrac{1}{u}=\dfrac{-1}{20}$

$\Rightarrow u=-20$ cm.

$\therefore $ The object is placed at a distance of $20$ cm.

Magnification is given as,

$\Rightarrow m=-\dfrac{v}{u}$

$\Rightarrow m=-\dfrac{20}{\left( -20 \right)}$

$\Rightarrow m=+1$

Also, magnification is given by, $m=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}$.

$\therefore m=\dfrac{Height\text{ of the image}}{2}$

$\Rightarrow 1=\dfrac{Height\text{ of the image}}{2}$

$\Rightarrow Height\text{ of the image}=2$ cm.

Thus, the image is of the same size as that of the object and it is real and inverted.

The ray diagram representing the formation of the image by the lens in this case is:

It is observed that the image is formed at $2{F_2}$ with the object placed at $2{F_1}$.

2. Draw a ray diagram to show the use of a convex lens for the formation of images having the following characteristics.

a. Real & inverted and diminished

Ans: A ray diagram representing a real & inverted and diminished image is given below.

b. Virtual, erect & magnified.

Ans: A ray diagram representing a virtual, erect, and magnified image is given below.

3. A convex lens forms a real and inverted image of a needle at a distance of $50$ cm. from it. Where is the needle placed in front of the convex lens if the image is equal to the size of objects? Also, find the power of the lens.

Ans: Given, the image is real and inverted at a distance of $50$ cm.

$\Rightarrow v=+50$ cm

Also given, Height of image $=$ Height of object

We know, magnification is given as,

$\therefore -\dfrac{v}{u}=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}$

Since, Height of image $=$ Height of object and $v=+50$ cm

$\Rightarrow -\dfrac{50}{u}=1$

$\Rightarrow u=-50$ cm

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{50}-\dfrac{1}{-50}$

$\Rightarrow f=25$ cm

$\Rightarrow f=0.25$ m

The power of a lens is given by,

$\Rightarrow P=\dfrac{1}{f}$

$\Rightarrow P=\dfrac{1}{0.25}$ m

$\Rightarrow P=+4$ D

4. One-half of a convex lens is covered with black paper. Will this lens produce a complete image of the object? Verify your answers experimentally. Explain your observations.

Ans: If we cover one-half of a convex lens with black paper it is observed that it produces a complete image of the object.

Representing the given situation with a ray diagram.

One-half of a convex lens is covered with black paper

Adjust the position of the burning candle such that its image is formed on the screen placed on the other side of the lens.

We get a full image of the burning candle on the screen.

Thus, from the above observation, we conclude that the formation of an image does not depend on the length of the lens, but the brightness of the image formed on the screen depends since the number of rays passing through the lens gets reduced on covering half the lens with black paper.

5. An object $5$ cm in length is held $25$ cm away from a converging lens of focal length $10$ cm. Draw the ray diagram and find the position, size, and nature of the image formed.

Ans: Given focal length of the lens, $f=+10$ cm.

Object distance from the converging lens is given to be $25$ cm and the height of the object ($ho$) is given to be $5$ cm.

$\Rightarrow u=-25$ cm

$\Rightarrow ho=5$ cm

$\Rightarrow \dfrac{1}{10}=\dfrac{1}{v}-\dfrac{1}{-25}$

$\Rightarrow \dfrac{1}{v}=\dfrac{1}{25}-\dfrac{1}{10}$

$\Rightarrow v=\dfrac{50}{3}$ cm

$\Rightarrow v=16.7$ cm

Thus, we conclude that the image formed is real and inverted and is formed at a distance of $16.7$ cm on the other side of the lens.

Also, magnification is given by, $m=\dfrac{Height\text{ of the image}}{Height\text{ of the object}}=\dfrac{hi}{ho}$.

$\therefore -\dfrac{v}{u}=\dfrac{hi}{ho}$

$\Rightarrow \dfrac{16.7}{-25}=\dfrac{hi}{5}$

$\Rightarrow hi=-\dfrac{10}{3}$ cm

Hence, the image is diminished.

The ray diagram representing the above situation is drawn below.

the image formed is real and inverted and is formed at a distance

6. A convex lens of focal length $15$ cm formed an image $10$ cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Ans: Given focal length of the lens, $f=15$ cm.

Image distance from the converging lens is given to be $10$ cm.

$\Rightarrow v=-10$ cm

We observe that the image distance is less than the focal length, hence the image formed would be virtual and erect.

$\Rightarrow \dfrac{1}{15}=\dfrac{1}{-10}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{u}=-\dfrac{1}{10}-\dfrac{1}{15}$

$\Rightarrow u=-6$ cm

The image distance is less than the focal length, hence the image formed would be virtual and erect.

Light: Reflection and Refraction - Important Questions and Solutions Summary

light rays, mirrors, lenses, prisms, etc., is the advanced version of what you As mentioned earlier, the chapter related to light, reflection, and refraction of have studied in the previous classes. In Class 10, you will have to focus on the theoretical part, as well as, the use of these theories to answer questions.

After you have completed answering the basic questions in the exercise, you might need a question bank to learn more about this chapter. This is where Light Reflection and Refraction Class 10 Important Questions with Answers can be used perfectly. These questions will intellectually challenge your knowledge and foundation of concepts based on this topic. You can answer on your own and check whether you know the right answer or not.

Class 10 Light Reflection and Refraction Important Questions have been developed by the expert teachers to provide a strong idea of how questions are set in the exams. All these questions are developed to define how theoretical concepts are used to solve conceptual problems. You will gain a better insight into the chapters and strengthen your foundation accordingly.

Benefits of Studying the CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction

The Important Questions for Class 10 Light Reflection and Refraction have been developed based on the basic and advanced concepts you have learned in your science textbook. Let us check the benefits of studying these questions first.

Thinking Out of the Box

The Important Questions of Light Reflection and Refraction Class 10 is the ultimate suggestion for the upcoming board exam. You can study these questions, prepare their answers on your own, and compare them with the solution provided. This will help you to understand how efficiently you have studied the chapter. Light Class 10 Important Questions have been developed to help you think out of the box. In most cases, the thoughts of the students remain stuck in the exercises of the textbook. These questions will help them think out of the box and challenge their intellect.

Getting to Know Possible Important Questions of Chapter 10 Class 10 Science

By studying Class 10th Science Chapter 10 Important Questions , you will get to know possible questions that might come in the board exams. All these questions are developed by experienced science teachers. They are well-aware of the type of questions asked in the CBSE exam . Hence, studying these questions will help you learn about different modes and patterns.

Making Concepts Easier to Understand

The Important Questions for Class 10 Science Light Reflection and Refraction have simple explanations. All the concepts in this chapter will be exceptionally simplified and utilized to answer these important questions. Hence, the students will get another way to learn how to use the textbook concepts to solve challenging questions in the exams.

Efficient Answering Methods

The Ch 10 Science Class 10 Important Questions will also come with a proper solution. The solutions will have the perfect answers to all these important questions. You will get another set of questions and answers to follow and find out the best approaches to score well in the exams. These approaches are simplified and designed by following the CBSE guidelines .

Mastering Solving Numerical Questions

This chapter poses a challenge in the form of numerical questions related to mirrors and lenses. These problems are based on a set of formulas related to the focal distance, object distance, and image distance of lenses and mirrors. By using Class 10 Science Chapter 10 Important Questions and Solutions, you can master using the formula in different aspects without committing mistakes.

You can download Chapter 10 Science Class 10 Important Questions and solutions in PDF format and study them offline. Get this extra set of questions and use them as a reference to clear your concepts of this crucial chapter.

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FAQs on CBSE Class 10 Important Questions on Science Chapter 10 - Light Reflection and Refraction 2024-25

1. Why Should You Prefer Vedantu for Important Questions of Light Class 10?

The teachers of Vedantu have formulated the best possible questions of Class 10 Light for the students to follow. The answers are simple and follow the CBSE guidelines. You can rest be assured that you will get the best-quality questions and answers to study.

2. Why Should You Study Light Reflection and Refraction Important Questions?

By studying the Light Reflection and Refraction Class 10 Important Questions, you will get a good idea of what questions are asked in the board exam. Follow the answering style and score more in the main exam.

3. What are the important topics covered in the CBSE Class 10 Science Chapter 10 - Light Reflection and Refraction?

The following are the important topics covered in the Chapter on Light Reflection and Refraction:

CBSE Class 10 Science Important Questions

Cbse study materials.

Case Based Questions Test: Light- Reflection & Refraction - 1 - Class 10 MCQ

10 questions mcq test - case based questions test: light- reflection & refraction - 1, following figure illustrates the ray diagram for the formation of images by a concave mirror. the position of the object is beyond the centre of curvature of the concave mirror. on the basis of given diagram, answer the questions. if the focal length of the concave mirror is 10 cm, the image formed will be at a distance ___________..

A. Between 10cm and 15cm
B. Between 10cm and 20cm
C. Beyond 20cm
D. At 20 cm

Following figure illustrates the ray diagram for the formation of images by a concave mirror. The position of the object is beyond the centre of curvature of the concave mirror. On the basis of given diagram, answer the questions. If the size of the object in the given figure is 5 cm and the magnification produced is –0.5. The size of the image is (in cm) ___________

Following figure illustrates the ray diagram for the formation of images by a concave mirror. The position of the object is beyond the centre of curvature of the concave mirror. On the basis of given diagram, answer the questions. An image formed by concave mirror is virtual, when the object is placed:

A. at infinity
C. Between C and F
D. Between P and F

Read the following passage and answer the questions.

A student wants to project the image of a candle flame on the walls of the school laboratory by using a mirror.

At what distance, in terms of focal length ‘f’ of the mirror, should he place the candle flame to get the magnified image on the wall ?

B. Between F and C
D. At infinity

(ii) In order to form a diminished image on the wall, the candle flame should be placed at a distance greater than 2F from the lens.

If the image formed by this mirror is inverted and real, the magnification will be:

A. Positive
B. Negative
C. Either of them
D. None of the above

A student wants to project the image of a candle flame on a screen 30 cm in front of a mirror by keeping the flame at a distance of 15 cm from its pole.

Suggest the type of mirror he should use:

A. convex mirror
B. plane mirror
C. concave mirror
D. none of the above

When object distance is less than focal length the image is _______ and when object distance is more than focal length the image is ______.

A. real, real
B. virtual. Virtual
C. real, virtual
D. virtual, real

The image formed in the above case is:

real , inverted and magnified

real, erect and magnified

virtual, inverted and magnified.

real, erect and diminished

A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to diverge. Real images can be produced by concave mirrors and converging lenses, only if the object is placed further away from the mirror/lens than the focal point, and this real image is inverted.

Read the passage and note the following observations. Answer the questions.

A student focussed the image of a candle flame on a white screen by placing the flame at various distances from a convex lens. He noted his observations as:

Which set of observations is incorrect and why?

A. Object distance can not be smaller than image distance
B. Image should form at 15cm only
C. Image should form at infinity
D. Object is kept at optical centre

(b) The observation (v) is incorrect. For this observation u = 15 = /, i.eThe object is at the focus and the image must be formed at infinity and not 70 cm.

(c) Since m = v/u , the size of the image will be equal to the size of the object, if v = u i.e., for the observation (iii).

What is the change in image observed as the object is moved from infinity towards the concave lens?

A. Size of image decreases
B. Size of image becomes highly diminished
C. Size of the image remains unchanged
D. Size of the image increases slightly

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CBSE Class 10 Science Chapter Wise Important Case Study Questions

Chapter wise important case study questions cbse class 10 science: cbse class 10 science board exam 2024 is just around the corner and students are working hard to score maximum marks. check these case study questions from class 10 science to ace your examination this year also download the solutions from the pdf attached towards the end. .

CBSE Class 10 Science Chapter Wise Important Case Study Questions: While the CBSE Board exam for Class 10 students are ongoing, the CBSE Class 10 Science board exam 2024 is to be held on March 2, 2024. With the exams just a few days away, CBSE Class 10th Board exam candidates are rushing to prepare the remaining syllabus, practising their weak portions, trying to revise the important questions from the past year papers, practise questions, etc.

Why are CBSE Class 10 Science Case Study Questions Important?

Section A : 20 Multiple Choice Questions (MCQs) carrying 1 mark each.
Section B : 6 Very Short Answer type questions carrying 2 marks each. Answers to these questions should be in the range of 30 to 50 words.
Section C : 7 Short Answer type questions carrying 3 marks each. Answers to these questions should be in the range of 50 to 80 words.
Section D : 3 Long Answer type questions carrying 5 marks each. Answers to these questions should be in the range of 80 to 120 words.
Section E : 3 Case Based/ Source Based units of assessment (4 marks each) with sub-parts.

How to solve case study questions in CBSE Class 10 Science?

Read the case given and the associated questions carefully.
Read the questions attentively and analyse what they are asking.
Apply your subject knowledge and theories in the given case to decide what the correct answers should be.

1.A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The massive force that pushes the rocket forward through space is generated due to the

(a) combination reaction

(b) decomposition reaction

(d) double displacement reaction

(ii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of

(a) lead nitrate

(b) nitrogen oxide

(d) oxygen gas

(iii) Which of the following reactions represents a combination reaction?

(a) CaO (s) + H2O (l) → Ca (OH)2 (aq)

(b) CaCO3 (s) → CaO (s) + CO2(g)

(d) 2FeSO4(s) → Fe2O3 (s) +SO2(g) + SO3(g)

(iv) Complete the following statements by choosing correct type of reaction for X and Y.

Statement 1: The heating of lead nitrate is an example of ‘X’ reaction.

Statement 2: The burning of magnesium is an example of ‘Y’ reaction.

(a)X-Combination,Y-Decomposition

(b)X-Decomposition,Y-Combination

(c)X-Combination,Y-Displacement

(d) X- Displacement, Y-Decomposition

2.The earlier concept of oxidation and reduction is based on the addition or removal of oxygen or hydrogen elements so, in terms of oxygen and hydrogen, oxidation is addition of oxygen to a substance and removal of hydrogen from a substance. On the other hand, reduction is addition of hydrogen to a substance and removal of oxygen from a substance. The substance which gives oxygen to another substance or removes hydrogen from another substance in an oxidation reaction is known as oxidising agent, while the substance which gives hydrogen to another substance or removes oxygen from another substance in a reduction reaction is known as reducing agent. For example,

(i) A redox reaction is one in which

(a) both the substances are reduced

(b) both the substances are oxidised

(d) one substance is oxidised while the other is reduced.

(ii) In the reaction, H2S+Cl2⟶S+2HCl

(a) H2S is the reducing agent.

(b) HCl is the oxidising agent.

(d) Cl2 is the reducing agent.

(iii) Which of the following processes does not involve either oxidation or reduction?

(a) Formation of slaked lime from quicklime.

(b) Heating mercuric oxide.

(d) Formation of zinc from zinc blende.

(iv) Mg+CuO⟶MgO+Cu

Which of the following is wrong relating to the above reaction?

(a) CuO gets reduced

(b) Mg gets oxidised.

(d) It is a redox reaction.

3.A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lemon on the vessel, the surface is cleaned, and the vessel begins to shine again. This is due to the fact that which reacts with the acid present in lemon to form a salt which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.

1.Which of the following acids is present in lemon?

(a) Formic acid

(b) Acetic acid

(d) Hydrochloric acid

2.The nature of copper oxide is

d) amphoteric

3.Name the salt formed in the above reaction

a) copper carbonate

b) copper chloride

c)copper citrate

d) copper citrate

4.The phenomenon of copper getting tarnished is

a) corrosion

b) rancidity

c) displacement

d)none of these

4.Metals as we know, are very useful in all fields, industries in particular. Non-metals are no less in any way. Oxygen present in air is essential for breathing as well as for combustion. Non-metals form a large number of compounds which are extremely useful, e.g., ammonia, nitric acid, sulphuric acid, etc. Non-metals are found to exist in three states of matter. Only solid non-metals are expected to be hard however, they have low density and are brittle. They usually have low melting and boiling points and are poor conductors of electricity.

i.____________ is a non-metal but is lustrous

A.Phosphorus

ii.Which of the following is known as 'King of chemicals'?

C. Sulphuric acid

D. Nitric acid

iii.Which of the following non-metals is a liquid?

iv.Hydrogen is used

A.for the synthesis of ammonia

B. for the synthesis of methyl alcohol

C.nitrogenous fertilizers

D. all of these

5.Nisha observed that the bottoms of cooking utensils were turning black in colour while the flame of her stove was yellow in colour. Her daughter suggested cleaning the air holes of the stove to get a clean, blue flame. She also told her mother that this would prevent the fuel from getting wasted.

a) Identify the reasons behind the sooty flame arising from the stove.

b) Can you distinguish between saturated and unsaturated compounds by burning them? Justify your answer.

c) Why do you think the colour of the flame turns blue once the air holes of the stove are cleaned?

6.Blood transport food, Oxygen and waste materials in our bodies. It consists of plasma as a fluid medium. A pumping organ [heart] is required to push the blood around the body. The blood flows through the chambers of the heart in a specific manner and direction. While flowing throughout the body, blood exerts a pressure against the wall or a vessel.

Pulmonary artery
Pulmonary vein
Very narrow and have high resistance
Much wide and have low resistance
Very narrow and have low resistance
Much wide and have high resistance
It is a hollow muscular organ
It is four chambered having three auricles and one ventricle.
It has different chambers to prevent O2 rich blood from mixing with the blood containing CO2
Both A & C
Blood = Plasma + RBC + WBC + Platelets
Plasma = Blood – RBC
Lymph = Plasma + RBC
Serum = Plasma + RBC + WBC

7.A brain is displayed at the Allen Institute for Brain Science. The human brain is a 3-pound (1.4-kilogram) mass of jelly-like fats and tissues—yet it's the most complex of all known living structures The human brain is more complex than any other known structure in the universe. Weighing in at three pounds, on average, this spongy mass of fat and protein is made up of two overarching types of cells—called glia and neurons— and it contains many billions of each. Neurons are notable for their branch-like projections called axons and dendrites, which gather and transmit electrochemical signals. Different types of glial cells provide physical protection to neurons and help keep them, and the brain, healthy. Together, this complex network of cells gives rise to every aspect of our shared humanity. We could not breathe, play, love, or remember without the brain.

1)Animals such as elephants, dolphins, and whales actually have larger brains, but humans have the most developed cerebrum. It's packed to capacity inside our skulls and is highly folded. Why our brain is highly folded?

b) Learning

3)Which among these protects our brain?

a)Neurotransmitter

b) Cerebrospinal fluid

d) Grey matter

4.Ram was studying in his room. Suddenly he smells something burning and sees smoke in the room. He rushes out of the room immediately. Was Ram’s action voluntary or involuntary? Why?

8.Preeti is very fond of gardening. She has different flowering plants in her garden. One day a few naughty children entered her garden and plucked many leaves of Bryophyllum plant and threw them here and there in the garden. After few days, Preeti observed that new Bryophyllum plants were coming out from the leaves which fell on the ground.

1.What does the incident sited in the paragraph indicate?

(a). Bryophyllum leaves have special buds that germinate to give rise to new plant.

(b). Bryophyllum can propagate vegetatively through leaves.

(c). Bryophyllum is a flowering plant that reproduces only asexually

(d). Both (a) and (b).

2.Which of the following plants can propagate vegetatively through leaves like Bryophyllum?

3.Do you think any other vegetative part of Bryophyllum can help in propagation? If yes, then which part?

4.Which of the following plant is artificially propagated (vegetatively) by stem cuttings in horticultural practices?

(b)Snakeplant

(d)Water hyacinth

9.The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of the population.

1) What are common signs of sexual maturation in boys?

a) Broadening of shoulders

b) Development of mammary glands

c) Broadening of waist

d) High pitch of voice

2) Common sign of sexual maturation in girls is

a) Low pitch voice

b) Appearance of moustache and beard

c) Development of mammary glands

d) Broadening of shoulders

3) Which contraceptive method changes the hormonal balance of the body?

b) Diaphragms

c) Oral pills

d) Both a) and b)

4) What should be maintained for healthy society?

a) Rate of birth and death rate

b) Male and female sex ratio

c) Child sex ratio

d) None of these

10.Pea plants can have smooth seeds or wrinkled seeds. One of the phenotypes is completely dominant over the other. A farmer decides to pollinate one flower of a plant with smooth seeds using pollen from a plant with wrinkled seeds. The resulting pea pod has all smooth seeds.

i) Which of the following conclusions can be drawn?

(1) The allele for smooth seeds is dominated over that of wrinkled seeds.

(2) The plant with smooth seeds is heterozygous.

(3) The plant with wrinkled seeds is homozygous.

(b) 1 and 2 only

(d) 1, 2 and 3

ii) Which of the following crosses will give smooth and wrinkled seeds in same proportion?

(a) RR X rr

(b) Rr X rr

(d) rr X rr

iii) Which of the following cross can be used to determine the genotype of a plant with dominant phenotype?

(a) RR X RR

(b) Rr X Rr

(d) RR X rr

iv) On crossing of two heterozygous smooth seeded plants (Rr), a total of 1000 plants were obtained in F1 generation. What will be the respective number of smooth and wrinkled seeds obtained in F1 generation?

(a) 750, 250

(b) 500, 500

(d) 950, 50

11.Food chains are very important for the survival of most species.When only one element is removed from the food chain it can result in extinction of a species in some cases.The foundation of the food chain consists of primary producers.Primary producers or autotrophs,can use either solar energy or chemical energy to create complex organic compounds,whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun’s light is necessary for photosynthesis,most life could not exist if the sun disappeared.Even so,it has recently been discovered that there are some forms of life,chemotrophs,that appear to gain all their metabolic energy from chemosynthesis driven by hydrothermal vents,thus showing that some life may not require solar energy to thrive.

1.If 10,000 J solar energy falls on green plants in a terrestrial ecosystem,what percentage of solar energy will be converted into food energy?

(d)It will depend on the type of the terrestrial plant

2.Matter and energy are two fundamental inputs of an ecosystem. Movement of

(a)Energy is by directional and matter is repeatedly circulating

(b)Energy is repeatedly circulating and matter is unidirectional

(c)Energy is unidirectional and matter is repeatedly circulating

(d)Energy is multidirectional and matter is bidirectional

3.Raj is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying

(a)First trophic level

(b)Second trophic level

(c)Third trophic level

(d)Fourth trophic level

4.Which of the following, limits the number of trophic levels in a food chain

(a)Decrease in energy at higher trophic levels

(b)Less availability of food

(c)Polluted air

5.The decomposers are not included in the food chain. The correct reason for the same is because decomposers

(a) Act at every trophic level at the food chain

(b) Do not breakdown organic compounds

(d) Release enzymes outside their body to convert organic material to inorganic forms

12.Shyam participated in a group discussion in his inter school competition on the practical application of light and was very happy to win an award for his school. That very evening his father gave treat to celebrate Shyam’s win. Shyam while sitting saw an image of a person sitting at his backside in his curved plate and could see that person’s mobile drop in the flower bed. Person was not aware until Shyam went and informed him. He thanked Shyam for his clever move.

a)From which side of his plate Shyam observed the incident –

i)outward curved

ii)inward curved

iii)plane surface

b)Part of plate from which Shyam observed the incident acted like a-

i)concave mirror

ii)convex mirror

iii)plane mirror

c)The nature of the size of the image formed in above situation is –

i)real, inverted and magnified

ii)same size , laterally inverted

iii)virtual, erect and diminished

iv)real , inverted and diminished

d)Magnification of the image formed by convex mirror is –

more than 1

iii)equal to 1

iv)less than 1

The location of image formed by a convex lens when the object is placed at infinity is

(a) at focus

When the object is placed at the focus of concave lens, the image formed is

(a)real and smaller

(b) virtual and smaller

The size of image formed by a convex lens when the object is placed at the focus ofconvex lens is

(a) highly magnified

(b) point in size

When the object is placed at 2F in front of convex lens, the location of image is

(b) between F and optical center

(d) none of the above

14.One of the wires in domestic circuits supply, usually with a red insulation cover, is called live wire. with black insulation is called neutral wire. The earth wire, which has insulation of green colour, is usually connected to a metal plate deep in the earth near the house appliances that has a metallic body. Overloading contact, in such a situation the current in the circuit abruptly increases. circuit prevents damage to the appliances and the circuit due to overloading.

1 When do we say that an electrical appliance

2 Mention the function of earth wire in electrical line

3 How is an electric fuse connected in a domestic circuit?

4 When overloading and short circuiting are said to occur?

5 What is a live wire?

15.Light of all the colours travel at the same speed in vacuum for all wavelengths. But in any transparent medium(glass or water), the light of different colours travels at different speeds for different wavelengths, which means that the refractive index of a particular medium is different for different wavelengths. As there is a difference in their speeds, the light of different colours bend through different angles. The speed of violet colour is maximum and the speed of red colour is minimum in glass so, the red light deviates least and violet colour deviates most. Hence, higher the wavelength of a colour of light, smaller the refractive index and less is the bending of light.

(i)Which of the following statements is correct regarding the propagation of Light of different colours of white light in air?

(a) Red light moves fastest.

(b) Blue light moves faster than green light.

(d) Yellow light moves with the mean speed as that of the red and the violet light.

(ii)Which of the following is the correct order of wavelength?

(a) Red> Green> Yellow

(b) Red> Violet> Green

(d) Red> Yellow> Orange

(iii)Which of the following is the correct order of speed of light in glass?

(a) Red> Green> Blue

(b) Blue> Green> Red

(d) Green> Red> Blue

(iv)Which colour has maximum frequency?

16.The region around a magnet where magnetism acts is represented by the magnetic field.The force of magnetism is due to moving charge or some magnetic material. Like stationary charges produce an electric field proportional to the magnitude of charge, moving charges produce magnetic fields proportional to the current. In other words, a current carrying conductor produces a magnetic field around it. The subatomic particles in the conductor, like the electrons moving in atomic orbitals, are responsible for the production of magnetic fields. The magnetic field lines around a straight conductor (straight wire) carrying current are concentric circles whose centres lie on the wire.

1)The magnetic field associated with a current carrying straight conductor is in anti- clockwise direction. If the conductor was held horizontally along east west direction,what is the direction of current through it?

2)Name and state the rule applied to determine the direction of magnetic field in a straight current carrying conductor.

3)Ramus performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that

a)The degree of deflection of magnetic compass increases when the compass is moved away from the conductor.

b)The degree of deflection of the magnetic compass increases when the current through the conductor is increased.

Which of the above observations of the student appears to be wrong and why?

Case Study Questions Class 10 Science CBSE Chapter Wise PDF

Related resources to prepare for cbse 10th science board exam 2024.

CBSE class 10 Science syllabus 2024
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Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science

Please see below Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science. These MCQ Questions with Answers for Case study have been designed as per the latest syllabus and examination guidelines of Class 10 Science. Cased Study Based MCQ Questions for Class 10 Science are expected to come in the upcoming exams. We have provided a lot of case studies for all chapters in standard 10 science. Please solve the MCQ Questions and compare with the answers provided by our teachers.

Chapter 10 Light Reflection and Refraction Class 10 Science Case Study MCQ Questions

Inside a substance such as glass or water, light travels more slowly than it does in a vacuum. If c denotes the speed of light in a vacuum and v denotes its speed through some other substance, then v = c/n where n is a constant called the index of refraction. To good approximation, a substance’s index of refraction does not depend on the wavelength of light. For instance, when red and blue light waves enter water, they both slow down by about the same amount. More precise measurements, however, reveal that n varies with wavelength. Table presents some indices of refraction of Custon glass, for different wavelengths of visible light. A nanometer (nm) is 10–9 meters. In a vacuum, light travels as c = 3.0 × 108 m/s

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science$

Question. Which of the following phenomena happens because n varies with wavelength (a) A lens focuses light (b) A prism breaks sunlight into different colors (c) Total internal reflections ensures that light travels down a fiber optic cable (d) Light rays entering a pond change direction at the pond’s surface

Question. Inside Custon glass (a) Orange light travels faster than yellow light (b) Yellow light travels faster than orange light (c) Orange and Yellow light travels equally fast (d) We cannot determine which color of light travels faster

Question. For blue-green of wavelength 520 nm, the index of refraction of Custon glass is probably closest to (a) 1.49 (b) 1.50 (c) 1.51 (d) 1.52

A 5.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm.

96. What is the power of the used lens? (a) + 5 D (b) – 5 D (c) + 0.5 D (d) – 0.5 D

Question. What is the distance of image from the pole of lens? (a) v = 60 cm (b) v = – 60 cm (c) v = 30 cm (d) v = –30 cm

Question. Figure shows a ray of light as it travels from medium A to

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science$

medium B. Retractive index of the medium B relative to medium A is (a) √3/2 (b) √2/√3 (c) 1/√2 (d) √2

Question. A ray of light is incident in medium 1 on a surface that separates medium 1 from medium 2. Let v 1 and v 2 represent the velocity of light in medium 1 and medium 2 respectively. Also let n 12 and n 21 represent the refractive index of medium 1 with respect to medium 2 and refractive index of medium 2 with respect to medium 1, respectively. If i and r denote the angle of incidence and angle of refraction, then- (a) sin i/sin r = n 21 , v 1 /v 2 (b) sin i/sin r = n 21 , v 2 /v 1 (c) sin i/sin r = n 12 , v 1 /v 2 (d) sin i/sin r = n 12 , v 2 /v 1

Question. A light ray enters from medium A to medium B as shown

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science$

in the figure. The refractive index of medium B relative to A will be (a) greater than unity (b) less than unity (c) equal to unity (d) zero

Question. You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at same angle would bend the most? (a) Kerosene (b) Water (c) Mustard oil (d) Glycerine

Question. The path of a ray of light coming from air passing through a rectangular glass slab traced by four students shown as A, B, C and D in the figure. Which one of them is correct?

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science$

(a) A (b) B (c) C (d) D

Rear view mirror is a device that allows the driver to see rear ward. It usually finds its place at the top of windscreen in side the cabin. This device is one of the most basic but essential safety devices in the vehicle. It provides assistance to the driver during overtaking, parking in reverse gear etc. Generally, vehicles also have a pair of mirrors attached to the body from outside. They are popular as ‘side mirrors’ or Outer Rear View Mirrors (ORVM) which serve the same purpose. Almost all modern cars mount their side mirrors on the doorsnormally at A-pillar rather than the wings (the portion of the body above the wheel well).

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science$

Question. Linear magnification (m) produced by a rear view mirror fitted in vehicles: (a) is equal to one (b) is less than one (c) is more than one (d) can be more or less than one depending on the position of object.

Question. A boy is standing in front of and close to a special mirror. He finds the image of his head bigger than normal, the middle part of his body of the same size, and his legs smaller than normal. The special mirror is made up of three types of mirrors in the following order from top downwards: (a) Convex, Plane, Concave (b) Plane, Convex, Concave (c) Concave, Plane, Convex (d) Convex, Concave, Plane

Question. A concave mirror cannot be used as: (a) a magnifying mirror (b) a torch reflector (c) a dentist’s mirror (d) a rear view mirror

Question. A real image of an object is to be obtained. The mirror required for this purpose is: (a) convex mirror (b) concave mirror (c) plane mirror (d) either convex or concave mirror

Question. A convex mirror is used: (a) by a dentist. (b) for shaving. (c) as a rear view mirror in vehicles. (d) as a light reflector for obtaining a parallel beam of light.

An Overhead Projector (OHP), like a film or slide projector; uses light to project an enlarged image on a screen. In the OHP, the source of the image is a page-sized sheet of transparent plastic film (also known as foils) with the image to be projected either printed or hand-written/ drawn. These are placed on the glass surface of the projector, which has a light source below it and a projecting mirror and lens assembly above it as shown in the figure.

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science$

Question. If the radius of curvature of concave mirror is 12 cm. Then, the focal length will be: (a) 12 cm (b) 6 cm (c) –24 cm (d) –6 cm

Question. The power of a convex lens is __________ and that of a concave lens is __________ . (a) positive, negative (b) positive, positive (c) negative, positive (d) negative, negative

Question. Based on the diagram shown, what kind of lens is used to make the overhead projector. (a) concave lenses (b) convex lenses (c) bifocal lenses (d) flat lenses

Question. Why is concave mirror used and not convex mirror in this projector? (a) because concave mirror can give real image. (b) because convex mirror can give real image. (c) because concave mirror cannot give real image. (d) because convex mirror cannot give virtual image

Question. The image obtained will be erect and real. How? (a) The image when passed through the lens was erect and was directly obtained on the screen. (b) The image when passed through the lens was inverted and then it gets reflected on the mirror to be obtained on the screen. (c) The screen used automatically makes the image erect and real. (d) Both (b) and (c)

A mirror is a surface that reflects a clear image. Images can be of two types: Real image and virtual image. An image that can be formed on the screen is known as a real image and the one which cannot be formed on the screen is known as a virtual image. These images are formed when light falls on a mirror from the object and is reflected back by the mirror on the screen. One useful tool that is frequently used to depict this idea is known as a ray diagram. A ray diagram is a diagram that traces the path that light takes in order for a person to view a point on the image of an object. On the diagram, rays (lines with arrows) are drawn for the incident ray and the reflected ray. A ray diagram used arrow type lines to represent the incident ray and the reflected ray. It also helps to trace the direction in which light travels.

Question. An object is placed beyond 2F, in front of a convex lens, image will be formed: (a) between F and 2F (b) at focus (c) at the centre of curvature (d) between focus and Optical centre.

Question. An object is placed at focus of a concave mirror, image will be formed at: (a) focus (b) between F and C (c) beyond C (d) at infinity

Question. Convex mirror always forms, an image: (a) Virtual, erect and enlarged. (b) Virtual, inverted and enlarged. (c) Virtual, erect and diminished. (d) Real, erect and diminished.

Question. A concave lens can form a real and inverted image, when: (a) Object is placed at 2F. (b) Object is placed beyond 2F. (c) Object is placed between f and 2F. (d) It can never form a real and inverted image.

Question. A convex lens forms the image of sun at: (a) C (b) focus (c) pole (d) between focus and pole

Aditya and his friend Manoj placed a candle flame in front of a convex lens at various distances from it and obtained the image of the candle flame on a white screen. He noted down the position of the candle, screen and the lens as under Position of candle = 20 cm Position of convex lens = 50 cm Position of the screen = 80 cm

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science$

Question. Manoj noted following observations at different positions of candle from the lens. According to Aditya one set of observations is incorrect. Find out if Aditya is right or not. (a) Distance of the flame from the lens = 60 cm; Distance of the screen from the lens = 20 cm (b) Distance of the flame from the lens = 45 cm; Distance of the screen from the lens = 22.5 cm (c) Distance of the flame from the lens = 30 cm; Distance of the screen from the lens = 30 cm (d) Distance of the flame from the lens = 10 cm; Distance of the screen from the lens = 15 cm

Question. Where will the image be formed if he shifts the candle towards the lens at a position of 35 cm? (a) At focus (b) Between focus and pole (c) At infinity (d) Between F 2 and F 1

Question. Which of the following statement describes the best about the nature of the image formed if Aditya shifts the candle towards the lens to 36 cm? (a) The nature of the image formed will be virtual, inverted and magnified. (b) The nature of the image formed will be virtual, erect and magnified. (c) The nature of the image formed will be virtual, erect and diminished. (d) The nature of the image formed will be real, inverted and diminished.

Question. What is the position of the image formed from the convex lens? (a) 80 cm (b) 50 cm (c) 30 cm (d) 60 cm

Question. What is the focal length of the convex lens? (a) 30 cm (b) 15 cm (c) –16 cm (d) 16 cm

Sumati wanted to see the stars of the night sky. She knows that she needs a telescope to see those distant stars. She finds out that the telescopes, which are made of lenses, are called refracting telescopes and the ones which are made of mirrors are called reflecting telescopes. So she decided to make a refracting telescope. She bought two lenses, L 1 and L 2 , out of which L 1 was bigger and L 2 was smaller. The larger lens gathers and bends the light, while the smaller lens magnifies the image. Big, thick lenses are more powerful. So to see far away, she needed a big powerful lens. Unfortunately, she realized that a big lens is very heavy. Heavy lenses are hard to make and difficult to hold in the right place. Also since the light is passing through the lens, the surface of the lens has to be extremely smooth. Any flaws in the lens will change the image. It would be like looking through a dirty window.

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science$

Question. What is the formula for magnification obtained with a lens? (a) Ratio of height of image to height of object. (b) Double the focal length. (c) Inverse of the radius of curvature. (d) Inverse of the object distance.

Question. Sumati bought not-so-thick lenses for the telescope and polished them. What advantages, if any, would she have with her choice of lenses? (a) She will not have any advantage as even thicker lenses would give clearer images. (b) Thicker lenses would have made the telescope easier to handle. (c) Not-so-thick lenses would not make the telescope very heavy and they will also allow considerable amount of light to pass through them. (d) Not-so-thick lenses will give her more magnification.

Question. Based on the diagram shown, what kind of lenses would Sumati need to make the telescope? (a) Concave lenses (b) Convex lenses (c) Bifocal lenses (d) Flat lenses

Question. If the powers of the lenses L 1 and L 2 are in the ratio of 4 : 1, what would be the ratio of the focal length of L 1 and L 2 ? (a) 4 : 1 (b) 1 : 4 (c) 2 : 1 (d) 1 : 1

Question. Sumati did some preliminary experiment with the lenses and found out that the magnification of the eyepiece (L 2 ) is 3. If in her experiment with L 2 she found an image at 24 cm from the lens, at what distance did she put the object? (a) 72 cm (b) 12 cm (c) 8 cm (d) 6 cm

$Case Study MCQ Questions Chapter 10 Light Reflection and Refraction$

Assignments For Class 10 Social Science

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NCERT Exemplar
NCERT Exemplar Class 7
Class 7 Science
Chapter 15 Light

NCERT Exemplar Solutions Class 7 Science Chapter 15 Light

NCERT Exemplar Solutions for Class 7 Science Chapter 15 Light are important for students to understand the concepts involved in Light and its phenomenon. This NCERT exemplar has answers to different kinds of questions, including fill in the blanks, matching the following questions, multiple-choice questions, and short and long answer questions based on topics, such as light paths, prisms and dispersion of light and uses of different mirrors.

NCERT Exemplar will help you gain in-depth knowledge of the concepts involved in Science and Maths subjects. These exemplar solutions are prepared by experienced teachers, which makes them the most reliable study material.

NCERT Exemplar Solutions for Class 7 Science given here has answers and explanations to 8 multiple-choice questions, 3 very short answer questions, 10 short answer questions and 3 long answer questions.

Download the PDF of NCERT Exemplar for Class 7 Science Chapter 15 – Light

Importance of NCERT Exemplar Solutions for Class 7 Science Chapter 15 Light

NCERT Exemplar Solutions for Class 7 Science Chapter 15 Light covers questions on nature and different phenomena of light, image formation by plane mirrors, spherical mirrors, and their image formation, and questions on experiments associated with the phenomena of light.

Topics Covered in NCERT Exemplar solutions for Class 7 Science Chapter 15 Light

15.1 – Light Travels Along a Straight Line

Ex 15.2 – Reflection of Light

Ex 15.3 – Right or Left!

15.4 – Playing with Spherical Mirrors

15.5 – Images Formed by Lenses

15.6 – Sunlight – White or Coloured?

Access Answers to NCERT Exemplar for Class 7 Science Chapter 15 – Light

Multiple-choice questions.

1. Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size, whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli are, respectively

(a) plane mirror and concave mirror.

(b) concave mirror and convex mirror.

(d) convex mirror and plane mirror.

The answer is (c) plane mirror and convex mirror.

Explanation:

The plane mirror always forms an image of the same size and erected image. Convex mirror forms erected and smaller image.

2. Which of the following can be used to form a real image?

(a) Concave mirror only.

(b) Plane mirror only.

(d) Both concave and convex mirrors

Soln: (a) concave mirror only

A concave mirror alone can produce a real image. Plane mirror & convex mirror form a virtual image of an object at all times.

3. If an object is placed at a distance of 0.5 m in front of a plane mirror, the distance between the object and the image formed by the mirror will be

The answer is (b) 1 m

The image formed by a plane mirror is at the same distance behind the mirror as the object is in front of it. Therefore, the distance between object and image is given by the distance between object and mirror + distance between mirror and image = 0.5 m+ 0.5 m = 1 m

4. You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object, you can use either

(a) concave mirror or convex mirror.

(b) concave mirror or convex lens.

(d) concave lens or convex lens.

Concave mirror and convex lens form enlarged images whereas convex mirror and concave lens form diminished images.

5. A rainbow can be seen in the sky

(a) when the sun is in front of you.

(b) when the sun is behind you.

(d) only at the time of sunrise.

The answer is (b) when the sun is behind you.

Rainbow is formed after rain and when the sunlight is low. A rainbow appears when is your back is towards the sun.

6. An erect and enlarged image can be formed by

(a) only a convex mirror.

(b) only a concave mirror.

(d) both convex and concave mirrors

The answer is (b) only a concave mirror.

The concave mirror always formed a virtual image which is erected and enlarged in size whereas convex mirror forms diminished and erected image.

7. You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from

(a) both the concave lens and convex lens.

(b) both concave mirror and convex mirror.

(d) both convex mirror and concave lens.

The answer is (c) both concave mirror and convex lens.

Concave mirror and convex lens can only form a real and inverted image of an object. As a convex mirror and concave lens always form a virtual and erect image of an object.

8. An image formed by a lens is erect. Such an image could be formed by a

(a) convex lens provided the image is smaller than the object.

(b) concave lens provided the image is smaller than the object.

(d) concave lens provided the image is of the same size.

The answer is (b) concave lens provided the image is smaller than the object.

Virtual, erect and diminished image of an object is formed by a concave lens. Convex lens forms magnified, erect and virtual image.

Very Short Answer Questions

9. The image formed by a lens is always virtual, erect and smaller in size for an object kept at different positions in front of it. Identify the nature of the lens.

The answer is Concave lens

10. Fill in the blanks:

(a) The inner surface of a steel spoon acts as a ___________ mirror. (b) The outer surface of a flat steel plate acts as a ___________ mirror. (c) The outer shining surface of a round bottom steel bowl acts as a __________ mirror. (d) The inner surface of the reflector of a torch acts as a __________ mirror.

(a) The inner surface of a steel spoon acts as a concave mirror. (b) The outer surface of a flat steel plate acts as a plane mirror. (c) The outer shining surface of a round bottom steel bowl acts as a convex mirror. (d) The inner surface of the reflector of a torch acts as a concave mirror.

11. State whether the following statements are True or False.

(a) A concave lens can be used to produce an enlarged and erect image.

(b) A convex lens always produces a real image.

(d) An object can be seen only if it emits light.

False- A concave lens can be used to produce a diminished and erect image.
False- A convex lens always produces a virtual image
False- An object can be seen if it reflects light falling on it.

Short Answer Questions

12. What type of mirror is used as a side mirror in a scooter? Why is this type of mirror chosen?

Convex mirrors are used as a side mirror in a scooter because in Convex mirrors image formed is spread over a large area. This will help the drivers to see the large area behind in the traffic.

13. Observe the figures given in Figure 15.1 carefully.

NCERT Exemplar Solutions Class 7 Science Chapter 15 Light-sol-1

The given figures show the path of light through lenses of two different types, represented by rectangular boxes A and B. What is the nature of lenses A and B?

Convex lens
Concave lens

14. Boojho made light from a laser torch to fall on a prism. Will he be able to observe a band of seven colours? Explain with a reason.

No, Boojho cannot observe a band of colours because laser light gives torch of only one colour.

15. State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B, shown in Figure 15.2.

NCERT Exemplar Solutions Class 7 Science Chapter 15 Light-sol-2

16. The side mirror of a scooter got broken. The mechanic replaced it with a plane mirror. Mention any inconvenience that the driver of the scooter will face while using it?

A driver cannot see the traffic spread over the large area behind him.

17. The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?

If the concave reflecting surface of a torch got rusted, a beam of light will be diffused with lower intensity.

18. An erect and enlarged image of an object is formed on a screen. Explain how this could be possible.

An erect and enlarged image of an object is formed on a screen if the object is placed upside down between F and 2F of the lens.

19. Two different types of lenses are placed on a sheet of newspaper. How will you identify them without touching them?

The lens is a convex lens if the letters appear magnified and the lens is concave if the image appears shortened.

20. A shopkeeper wanted to fix a mirror which would give a maximum view of his shop. What type of mirror should he use? Give reason.

The shopkeeper fixes convex mirror because forms images of object spread from large areas.

21. The distance between an object and a convex lens is changing. It is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?

An object is moving away from the lens.

Long Answer Questions

22. Suppose we wish to obtain the real image of a distant tree. Explain two possible ways in which we can do it.

Two possible ways in which the real image of a distant tree can be obtained are given below :

By using a concave mirror and a screen- By using a concave mirror, a real image is formed if the distance between the mirror and the object is beyond the focus.
By using a convex lens and a screen- In a convex lens, when the object is far away from the lens, the image is very close to the lens forming a real and inverted image.

23. It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still able to obtain the image on the screen? Explain.

It is a convex lens.

No, when the object is placed close to a convex lens then the image formed is virtual, which cannot be obtained on the screen.

24. You are given three mirrors of different types. How will you identify each one of them?

We can identify the mirrors by forming images of an object which are given as below:

i) Plane mirror, in the case of a plane mirror, the image will be virtual, erect and of the same size as that of an object.

ii) Concave mirror, in the case of a concave mirror, an image may be real or virtual, inverted or erect and magnified or diminished depending upon the position of the object.

iii) Convex mirror, in the case of a convex mirror, an image formed will always be virtual, erect and diminished in spite of the position of the object.

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Frequently Asked Questions NCERT Exemplar for Class 7 Science Chapter 15 Light

The image formed by a lens is always virtual, erect and smaller in size for an object kept at different positions in front of it. identify the nature of the lens..

The answer is concave lens.

What type of mirror is used as a side mirror in a scooter? Why is this type of mirror chosen?

Convex mirrors are used as side mirrors in a scooter because, in convex mirrors, the image formed is spread over a large area. This will help the drivers to see the large area behind in the traffic.

Boojho made light from a laser torch to fall on a prism. Will he be able to observe a band of seven colours? Explain with a reason.

No, Boojho cannot observe a band of colours because laser light gives a torch of only one colour.

The side mirror of a scooter got broken. The mechanic replaced it with a plane mirror. Mention any inconvenience that the driver of the scooter will face while using it.

The driver cannot see the traffic spread over the large area behind him.

The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?

If the concave reflecting surface of a torch got rusted, a beam of light would be diffused with lower intensity.

An erect and enlarged image of an object is formed on a screen. Explain how this could be possible.

Two different types of lenses are placed on a sheet of newspaper. how will you identify them without touching them.

The lens is a convex lens if the letters appear magnified, and the lens is concave if the image appears shortened.

A shopkeeper wants to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give a reason.

The shopkeeper fixes a convex mirror because it forms images of objects spread from large areas.

The distance between an object and a convex lens is changing. It is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?

The object is moving away from the lens.

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Chapter Light part -2 refraction Case study-based questions Question 1 Question 2 . Question 3 . Question 4 . Question 5 . Answer key (iv) When light passes from glass to water, the speed of light decreases first increases then decrease due to retraction of light. at same depth
Class 10 Science: Case Study Chapter 10 Light Reflection and Refraction
Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 10 Light Reflection and Refraction. Case Study/Passage-Based Questions. Question 1: The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on the screen, the image is real and when the ...
Case Study Questions Class 10 Science Chapter 10 Light ...
Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 10 Light Reflection and Refraction. Case Study/Passage-Based Questions. Question 1: The spherical mirror forms different types of images when the object is placed at different locations. When the image is formed on the screen, the image is real and when the ...
CBSE Class 10 Physics Chapter 10 Light Reflection and Refraction
Case Study Based Questions. Q.1. Light is a form of energy which induces sensation of vision to our eyes. It becomes visible when it bounces off on surfaces and hits our eyes.
CBSE Class 10 Important Questions on Science Chapter 10
The Important Questions of Light Reflection and Refraction Class 10 is the ultimate suggestion for the upcoming board exam. You can study these questions, prepare their answers on your own, and compare them with the solution provided. This will help you to understand how efficiently you have studied the chapter.
Case Based Questions Test: Light- Reflection & Refraction
Solutions of Case Based Questions Test: Light- Reflection & Refraction - 1 questions in English are available as part of our course for Class 10 & Case Based Questions Test: Light- Reflection & Refraction - 1 solutions in Hindi for Class 10 course. Download more important topics, notes, lectures and mock test series for Class 10 Exam by signing up for free.
CBSE Class 10 Science Chapter Wise Important Case Study Questions
The Chapter wise Important case study based questions with their solved answers in CBSE Class 10 Science can be accessed from the table below: CBSE Class 10 Science Chapter 1 Chemical Reactions ...
Case Study MCQ Questions Chapter 10 Light Reflection and Refraction
Chapter 10 Light Reflection and Refraction Class 10 Science Case Study MCQ Questions. Inside a substance such as glass or water, light travels more slowly than it does in a vacuum. If c denotes the speed of light in a vacuum and v denotes its speed through some other substance, then v = c/n where n is a constant called the index of refraction.
NCERT Exemplar solutions for Class 7 Science Chapter 15- Light
Frequently Asked Questions NCERT Exemplar for Class 7 Science Chapter 15 Light. Q1. The image formed by a lens is always virtual, erect and smaller in size for an object kept at different positions in front of it. Identify the nature of the lens. The answer is concave lens.
Light Class 7 Extra Questions Science Chapter 15
Light Class 7 Science Extra Questions Very Short Answer Type Questions. Question 1. Briefly mention whether mirror change the direction of light. Answer: Yes, when a ray of light is incident on the mirror surface, then the mirror changes the direction of light. Question 2. The image formed by a lens is always virtual, erect and smaller in size ...
Light Class 8 Extra Questions Science Chapter 16
Answer: Irregular reflection is defined as the reflection of light from an uneven surface. In irregular reflection, the reflected beam is not parallel. Question 8. List the characteristics of an image formed in a plane mirror. Answer: he characteristics of an image formed in a plane mirror are: It is virtual.

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