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Case Study Questions for Class 8 Science Chapter 5 Coal and Petroleum

Last modified on: 10 months ago
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Here we are providing case study questions for CBSE Class 8 Science Chapter 5 Coal and Petroleum .

Case Study Questions

Question 1:

Read the passage carefully and answer the following questions.

In the light of the availability of various resources in nature, natural resources can be broadly classified into two kinds- Inexhaustible and Exhaustible resources. Inexhaustible natural resources are present in unlimited quantities in nature and are not likely to be exhausted by human activities. Examples are sunlight, and air. Exhaustible resources are present in limited quantities in nature. They can be exhausted by human activities. Examples of these resources are forests, wildlife, minerals, coal, petroleum, natural gas etc. some exhaustible natural resources like coal, petroleum and natural gas. These were formed from the dead remains of living organisms (fossils). So, these are all known as fossil fuels.

i) Exhaustible natural resources are: a. Unlimited in quantity. b. Not dependent on nature. c. Limited in quantity. d. Not exhausted by human activities.

ii) Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource? a. minerals b. water c. soil d. plastic

iii) Which of the following is an exhaustible natural resource? a. air b. sunlight c. forest d. wind

iv) Identify the fossil fuel/ fuels from the following: a. Coal b. Petroleum c. Natural gas d. All of these

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Coal and Petroleum Class 8 Case Study Questions Science Chapter 3

Last Updated on April 20, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 8 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 8 science. In this article, you will find case study questions for cbse class 8 science Chapter 3 Coal and Petroleum.

Table of Contents

Case Study Questions on Coal and Petroleum

Nowadays we are very much dependent on fossil fuels. Increase in the use of coal and petroleum has led to difficulties in managing fossil fuels, and now the time is not far when we run on shortage of them. There are many steps taken by the different governments to decrease the consumption of fossil fuels such as promoting natural gases and making it mandatory for all the vehicles or promoting the usage of electric vehicles on subsidised costs. Coal and petroleum are very useful sources. We need to save them so that it gets easier to manage our natural resources. There are many alternatives like solar energy, electric vehicles, etc which are environment friendly. Many countries are trying to replace all the vehicles which run on diesel and petrol with electric vehicles by 2030. Some serious steps need to be taken in order to manage these sources and save our environment.

Q. 1. An ideal fuel should have a _________calorific value. (a) Low (b) High (c) Sufficient (d) None of the above.

Difficulty Level: Easy

Ans. Option (b) is correct. Explanation: An ideal fuel should have a high calorific value because calorific value of a fuel is the amount of heat liberated on complete burning of a unit mass or volume of a fuel. It is expressed in kJ/kg.

Also read: Coal and Petroleum Assertion Reason Questions for Class 8 Science

Q. 2. Which of the following is not a fossil fuel? (a) Kerosene (b) Coal tar (c) Water (d) Petrol

Ans. Option (c) is correct. Explanation: Water is not a fossil fuel. It is a natural resource which is present in unlimited quantity in nature and will not get replenish.

Q .3. Explain how the use of CNG in automobiles has reduced pollution in our cities.

Difficulty Level: Medium

Ans. Compressed Natural Gas (CNG) is a clean fuel and does not give smoke when burnt as compared to other petroleum containing fuels like petrol and diesel.

For automobiles to run, petroleum fuel is burnt.
The combustion of fuel leaves unburnt carbon particles in the air, along with carbon monoxide (CO) – poisonous and harmful gas.
Breathing CO causes headache, dizziness, etc.
CNG burns completely leaving no harmful residue. Hence, the use of CNG in automobiles has reduced pollution in our cities.

Q.4. What are petrochemicals?

Ans. Petrochemicals are chemical products obtained from petroleum and natural gas are used in the manufacture of detergents, fibers (polyester, nylon, acrylic etc.), polythene and other man-made plastics. Hydrogen gas is obtained from natural gas, is used in the production of fertilisers (urea).

Sound Class 8 Case Study Questions Science Chapter 10
Friction Class 8 Case Study Questions Science Chapter 9
Force and Pressure Class 8 Case Study Questions Science Chapter 8
Reaching the Age of Adolescence Class 8 Case Study Questions Science Chapter 7
Reproduction in Animals Class 8 Case Study Questions Science Chapter 6
Conservation of Plants and Animals Class 8 Case Study Questions Science Chapter 5
Combustion and Flame Class 8 Case Study Questions Science Chapter 4

Microorganisms: Friend and Foe Class 8 Case Study Questions Science Chapter 2

Crop production and management class 8 case study questions science chapter 1, topics from which case study questions may be asked.

Discussing about the types of natural resources.
Learning about fossil fuels.
Learning about coal and the products we obtain from it.
Understanding how petroleum was formed.
Learning the importance of natural gas as fuel.
Knowing the ways to save fossil fuels as they are exhaustible.

We require various materials to fulfill our basic needs. Some of them are found in nature and some have been made by human efforts. The various resources which are obtained from nature are called natural resources, e.g., air, water, soil, etc. This chapter deals with some of the natural resources and how they are useful to us.

Coal and Petroleum Class 8 Case Study Questions Science Chapter 2

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NCERT Solutions for Class 8 Science Chapter 5 - Coal And Petroleum
NCERT Solutions

NCERT Solutions for Class 8 Science Chapter 5 - Free PDF Download

For developing minds, it is crucial to learn about fossil fuels, how they are extracted, and how they are being replaced with more environmentally friendly energy. For this reason, the CBSE added a chapter on coal and petroleum to the Class 8 Science book. The fifth chapter discusses the depletion of the nonrenewable resources that we use on a daily basis. Chapter 5 of the science curriculum for class 8 is very important. By consulting the NCERT solutions for Class 8 Science Chapter 5 by Vedantu, you should follow the exercise questions and learn how to respond to them.

Download the solution for NCERT Class 8 Science Chapter 5 in PDF format for free and use it offline for preparing the chapter quickly. You can be assured that the answers in this solution will be of the highest-quality formed as per the CBSE rules. Learn the chapter of fossil fuels and other inexhaustible energy sources from this chapter and proceed to prepare the answers using the NCERT solutions Class 8 Science Chapter 5. 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 8 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

Important Topics Covered in Chapter 5 of Class 8 Science NCERT Solutions

The topics and subtopics that are covered in Chapter 5 of NCERT Solutions for Class 8 Science are given as follows:

Fossil fuel

Natural gas

Refining of petroleum

Access NCERT Solutions for Class 8 Science Chapter 5 – Coal and Petroleum

1. What are the advantages of using CNG and LPG as fuels?

Ans: The advantages of using compressed natural gas (CNG) and liquified petroleum gas (LPG) as fuels is as follows:

They give a lot of heat energy when burnt as compared to other fuels like kerosene, coal, etc

They do not emit smoke when burnt, as they are clean fuels.

They have low prices.

They are easily available.

They can be easily transported by cylinders or pipelines.

2. Name the petroleum product used for surfacing of roads.

Ans: Bitumen is the petroleum product used for surfacing roads.

3. Describe how coal is formed from dead vegetation. What is this process called?

Ans: Coal is made up of the remains of dead plants and animals buried in the ground, exposed to high temperatures and pressure in the absence of air. This process of the formation of coal is known as carbonization. 4. Fill in the banks.

a) Fossil fuels are ____ , ____ and _____.

Ans: Fossil fuels are coal, petroleum and natural gas.

b) Process of separation of different constituents from petroleum is called ____.

Ans: Process of separation of different constituents from petroleum is called refining.

c) Least polluting fuel for vehicles is _____.

Ans: Least polluting fuel for vehicles is compressed natural gas (CNG). 4. Tick True/False against the following statements.

a) Fossil fuels can be made in the laboratory.

Ans: False. Fossil fuels are made from the remains of dead plants and animals buried inside the earth millions of years ago and exposed to high temperature and pressure conditions.

b) CNG is more polluting fuel than petrol.

Ans: False. CNG is an eco-friendly fuel and safe to use as it does not cause any health issues. Therefore, it is very less polluting.

c) Coke is almost pure form of carbon.

Ans: True. Coke is a fuel with few impurities and high carbon content. That is why it is an almost pure form of carbon.

d) Coal tar is a mixture of various substances.

Ans: True. Coal tar is a mixture of various substances such as dyes, paints, explosives, drugs, etc.

e) Kerosene is not a fossil fuel.

Ans: False. Kerosene is one of the products of the distillation of petroleum products. 5. Explain why fossil fuels are exhaustible natural resources.

Ans: Mineral oil is made from the dead remains of plants and animals that were buried in the ground millions of years ago under high temperatures and pressure, which cannot be synthesized in the laboratory. Therefore, fossil fuels are a completely natural resource.

6. Describe characteristics and uses of coke.

Ans: Coke is a substance produced by the destructive distillation of coal. It is a grey, hard and porous fuel with high carbon content and few impurities. It is used to make steel and metal extraction as a reducing agent.

7. Explain the process of formation of petroleum.

Ans: Petroleum is made up of dead plant and animal fossils buried in the ground millions of years ago under high temperatures and pressure in the absence of air the dead remains are broken into smaller units to form petroleum and natural gas.

8. The following Table shows the total power shortage in India from \[1991-1997\] . Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

Ans: Plot the graph from the above data taking shortage percentage on the Y-axis and the year on the X-axis:

For example, for the year \[1991\] we mark the point \[7.9\] on the Y-axis.

Similarly, plotting the other points we get,

NCERT Solutions for Class 8 Science Chapter 5 - Coal and Petroleum

Coal and petroleum: ncert solutions for class 8 chapter 5 science summary.

The prime pillar of human development is the discovery of natural fuels. Coal and petroleum have been the main source of energy that drives our homes and machines. Without them, we would have stopped everything we use these days and go back to the dark ages. NCERT Class 8 Chapter 5 Science tells us how brilliant the discovery of fossil fuels has catapulted the growth of human civilization towards a better future. As per the Class 8 Science Chapter 5 Coal and Petroleum, these sources are getting exhausted day by day. Scientists have started to harness the inexhaustible energy from natural sources by preparing new machines.

In this Class 8th Science Chapter 5, you will also learn how fossil fuels are formed. Learn how they take millions of years and the right conditions to develop into coal and petroleum. In this chapter, you will also learn how destructive distillation and fractional distillation give us the products we use. Coal and petroleum cannot be used in natural conditions. They are chemically and physically treated to produce the fuels and products fit for usage. Study the NCERT Class 8 Science Chapter 5 properly and learn the new concepts in such a way that you can answer the questions in the exercises.

To help you in this section, the teachers of Vedantu have prepared NCERT Solutions for Class 8 Science Chapter 5. You can refer to the answers scribed by the teachers experienced in teaching Class 8 Science. These teachers are aware of the problems generally faced by the students while studying this chapter. All the answers are formulated following the CBSE guidelines.

NCERT Solutions of Class 8 Science Chapter Wise Marks Weightage

The Coal and petroleum Chapter will have good weightage in the examination and is an important chapter from the exam point of view. The topic of fossil fuels has the highest weightage in this topic. The topic explained in this will help you obtain more marks and will let you understand the concept very well. There is a high scope of getting 5 marks questions. The 3 marks and 2 marks questions from this topic are equally important. The 2 marks questions are important ones and there are few frequently asked questions listed below which will help you understand the type of questions asked in the exam.

Why Should You Use NCERT Solutions for Class 8 Science Coal and Petroleum?

The prime reasons for using NCERT Solutions for Class 8 Science Coal and Petroleum are mentioned below.

Appropriate Answers for Chapter 5 Class 8 Science

It becomes a lot easier to find the answers to the exercise questions from the Class 8 Science Ch 5 solution. The solution has been formatted following the exercise. Hence, students of Class 8 will find out the answers to a particular question without any delay. All these answers are appropriate and can be used during the exams to score better.

Simplified Explanations of the Answers

Students might need an explanation of the answers to the questions in the exercise. It can be achieved by following the answers provided in Chapter 5 Science Class 8 NCERT Solutions. All the questions are explained and the answers are simplified so that students can also make their own.

Proper Preparation of Chapter 5 Science Class 8

If you have an exam, use the NCERT solution of Class 8 Science Chapter 5 and revise the chapter easily. You can also find the shortest way to answer the exercise questions to prepare.

Following CBSE Format

When you use the NCERT solutions for Class 8 Science Ch 5, you will automatically learn the CBSE format to answer questions and score better in the exams.

Download the NCERT solutions Class 8 Science Chapter 5 for free and access it to prepare the chapter offline. There is no need to delay as you can clear your doubts by referring to the NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum.

Chapter wise NCERT Solutions for Class 8 Science

Chapter 1 - Crop Production and Management

Chapter 2 - Microorganisms : Friend and Foe

Chapter 3 - Synthetic Fibres and Plastics

Chapter 4 - Materials : Metals and Non-Metals

Chapter 5 - Coal and Petroleum

Chapter 6 - Combustion and Flame

Chapter 7 - Conservation of Plants and Animals

Chapter 8 - Cell - Structure and Functions

Chapter 9 - Reproduction in Animals

Chapter 10 - Reaching The Age of Adolescence

Chapter 11 - Force and Pressure

Chapter 12 - Friction

Chapter 13 - Sound

Chapter 14 - Chemical Effects of Electric Current

Chapter 15 - Some Natural Phenomena

Chapter 16 - Light

Chapter 17 - Stars and The Solar System

Chapter 18 - Pollution of Air and Water

Along with this, students can also view additional study materials provided by Vedantu, for Class 8 :

NCERT Exemplar for class 8 Science Chapter 5

CBSE Revision Notes for class 8 Science Chapter 5

Important Points Discussed in Chapter 5 of Class 8 Science NCERT Solutions

The resources which will never be exhausted by human activities are called Inexhaustible natural resources whereas the resources which will be exhausted by human activities and are limited in nature are called exhaustible natural resources.

Coal is a hard substance which is black in colour. It is used as fuel in household and industrial activities.

Coke is the extracted substance of coal. While extracting coke from the coal, coal gas is produced.

Petroleum is also a natural resource which is exhaustible in nature. Petroleum is the mixture of petrol, diesel, petroleum gas, lubricating oil, etc. Various petroleum products are used in many household and commercial fields.

The following are some of the benefits of using CNG and LPG as fuels:

Both CNG and LPG are easily ignited.

When CNG and LPG are burned, a lot of heat energy is released.

CNG and LPG are easily transported.

When burned, CNG and LPG are non-toxic fuels that do not emit smoke.

Conclusion

NCERT Solutions for Class 8 Science Chapter 5 - "Coal and Petroleum" are invaluable resources that deepen students' understanding of these essential natural resources. The chapter explores the origin, formation, and extraction of coal and petroleum, shedding light on their significance in the energy sector. These solutions provide comprehensive explanations, ensuring that students grasp the scientific principles behind these fossil fuels. Additionally, they emphasize the environmental impact and the need for sustainable alternatives, fostering environmental consciousness among learners. These solutions equip students not only with knowledge but also with a sense of responsibility towards the conservation of these non-renewable resources, making them informed global citizens.

FAQs on NCERT Solutions for Class 8 Science Chapter 5 - Coal And Petroleum

1. What is the Best Way to Prepare CBSE Class 8 Science Chapter 5 Coal and Petroleum?

The best way to prepare the chapter is to follow the classroom sessions, study the chapter well, and solve the exercise questions. Refer to the Class 8 Science Chapter 5 Solutions to find answers quickly and compare them with yours. You can also revise the chapter by using the NCERT solution for Class 8 Science Chapter 5 and save time before an exam.

2. Why Coal and Petroleum are Important for us?

The entire world needs the energy to run its machines and factories. As per the Science Chapter 5 Class 8, coal and petroleum are the prime sources of energy we use.

3. Why Should You Prefer Vedantu for NCERT Solution Class 8 Science Chapter 5?

Vedantu provides quality NCERT Solutions of Class 8 Science Chapter 5 that match all your requirements to prepare the chapter.

4. What are Petroleum and Coal?

Both petroleum and coal are types of fossil fuels. Coal is black and is hard as a stone. In old times it was used as a burning agent for cooking food and for the production of steam for engines and trains. Coke, coal tar, and coal gas are products obtained from coal. Petroleum is a dark-coloured oily liquid that contains a foul smell. Petroleum gas, petrol, diesel, lubricating oil are a few of its constituents.

5. What are the advantages of using CNG and LPG as fuels?

The full form of CNG is ‘Compressed Natural Gas’. The full form of LPG is ‘Liquified petroleum gas’. A few of the advantages of using CNG and LPG as fuels are listed below;

CNG and LPG do not cause pollution. At the time of burning, they release a smokeless flame as they are clean fuels.

No ashes are left behind while burning.

The handling process is quite easy.

For storing purposes, they are convenient.

6. What are Fossil Fuels according to the NCERT Solutions?

According to NCERT Solutions, when the remaining matter of plants and animals decays and remains buried for millions of years under the Earth’s surface inside the soil, this leads to the formation of fossil fuels. They are an exhaustible natural resource, which means that they are limited in nature. They can be exhausted sooner due to human activities. Coal, petroleum, and natural gas are the types of fossil fuels.

7. Write the summary of NCERT Class 8 Science Chapter 5.

Class 8 Science Chapter 5 consists of many concepts and definitions like the formation of coal, short descriptions of natural resources, fossil fuels, types of energies, different types of coal found, fractional distillation, oil extraction, natural gas, and more. This is just a glimpse of Chapter 5. There is still much left for you to study. You can get the detailed study material on Vedantu’s website. The solutions are prepared by experts and are available free of cost. You can also download them from Vedantu’s app, which is available at the Google Playstore.

8. List some key concepts in NCERT Class 8 Science Chapter 5.

There are a bulk of different concepts or topics in this chapter, but some of the key concepts in NCERT Class 8 Science Chapter 5 are given below -

Definition of CNG and its advantages

What do you mean by Vaporisation?

Short note on energy and its types

Types of natural resources

Main constituents of petroleum

Carbonisation

Describe petroleum refining.

NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum

Chapter 5 Coal and Petroleum Class 8 Science NCERT Solutions

Class 8 science chapter 5 coal and petroleum ncert questions and answers - topics, chapter 5 coal and petroleum ncert solutions for class 8 science - notes, chapter 5 coal and petroleum class 8 science questions and answers - mcq questions with answers, contact form.

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Coal and Petroleum CBSE Class 8 Science Revision Notes Chapter 5

Figure 1 Classification of Resources

Coal, Petroleum and Natural Gas are exhaustible natural resources. They are fossil fuels.

Fossil fuels are fuels that are formed by fossils (or dead remains) of living organisms.

What are fuels?

A fuel is any substance that releases large amounts of energy in the form of heat and light when it is burned. For example, coal and petroleum are fuels.

Fuels can be classified as:

Why do we need fossil fuels?

Fuels are required for different purposes such as:

Transportation : fuels are used to run different vehicles such as cars, trucks, motorcycles, trains, airplanes etc.

Cooking : fuels are needed for cooking. For instance, LPG is used in urban areas while firewood, coal and cattle dung is used in rural areas.

Heating : fuel is also used to generate heat

Electricity production: different fuels such as coal, petrol, natural gas and diesel are used to generate electricity in power plants

Industrial usage : many industries use fuels for different purposes such as producing electricity, running their machinery and heating

Rockets and other space vehicles : fuels called propellants are used in rockets that help in launching the space vehicles

What are the characteristics of a good fuel?

The characteristics of good fuel are:

It should be economical.

It should be available easily

It should not emit poisonous gases on burning

It should produce large amounts of heat with respect to its mass (it should have a high calorific value)

It should be easy to transport and handle

It should not produce a bad odour

It should be clean and should not produce many ashes

It should not ignite easily at room temperature

Figure 2 Coal

Coal is a fossil fuel formed from dead plant matter over millions of years due to heat and pressure.

How is Coal formed?

Figure 3 Formation of Coal

Over millions of years, coal is formed through different biological and geological processes on dead and decaying plant matter.

Coal mainly contains carbon. The process of conversion of dead vegetation into coal is called carbonisation.

Coal comes from a coal mine.

What is the composition of coal?

Coal consists of hydrogen, carbon and oxygen and sulphur (small amount).

What is coal mining?

Coal is extracted from the ground with a process called mining. Coal Mining can be of two types:

Opencast Mining: Mining in which coal is extracted from near the earth’s surface

Underground Mining: Mining in which coal is extracted from deep inside the earth’s crust

Different Types Coal

As coal gets older, the carbon content in it is higher. When coal is burnt, it mainly produces carbon dioxide gas.

Figure 4 Types of Coal

Uses of Coal

Used as fuel to cook food.

Used in thermal power plants to produce electricity.

Used as fuel in various industries.

Once used as fuel to run steam-powered railway engines.

When processed, coal yields coke, coal tar and coal gas which in turn is used by many industries.

What is destructive distillation?

Figure 5 Destructive Distillation

It is a process in which coal is heated at very high temperature in the absence of air to obtain various useful products from it. Consider the diagram below to understand the process of destructive distillation. Different products obtained through this process are coal gas, coal tar, coke and liquor ammonia.

Figure 6 Destructive Distillation Process Flow Chart

Major Coal Products

Figure 7 Coal products

What are hydrocarbons?

Hydrocarbons are the substances that consist of only carbon and hydrogen. Compounds like methane, butane, and hexane are hydrocarbons that are produced on burning of the fossil fuels.

What will happen if the coal reserves get depleted?

Coal is being used as a major source of energy in industries as well as rural areas.

Not only this, it serves various other purposes like the synthesis of synthetic oil, natural gas, coke, coal tar and coal gas.

If the amount of coal gets depleted it would become much difficult for us to produce energy for various purposes. Hence, we must use coal in an efficient way.

What substances are released on the burning of coal?

Carbon dioxide

Carbon monoxide

Sulphur Dioxide

Figure 8 Petroleum

The term 'Petroleum' is derived from two words - 'Petra' which means 'rock' and 'oleum' which means 'oil'. It is mined from the rocks under the Earth.

Petroleum (also known as crude oil) is a fossil fuel formed from the remains of ancient marine organisms.

How is Petroleum and Natural Gas formed?

Figure 9 Formation of petrol and natural gas

When the sea organisms die, their bodies sink to the bottom of the sea. With time, they get covered by the layers of sand and clay.

Over millions of years, these remains get transformed in petroleum and natural gas due to high temperature, high pressure, and absence of air.

When we dig oil wells, natural gas is above crude oil which in turn is above water. This happens because gas and oil are lighter than water and do not mix with it.

Refining of Petroleum

Originally, petroleum is a mixture of many things, such as petrol, diesel, petroleum fas, paraffin wax, lubricating oil etc.

It is a dark and oily liquid with an unpleasant odour.

Refining of petroleum is the process by which different constituents of petroleum are separated.

This process takes place in a petroleum refinery.

Constituents of Petroleum and their Uses

Figure 11 Constituents of Petroleum

Why Petroleum is called ‘black gold?

Petroleum is called 'black god' because it yields several substances that are commercially successful. The useful substances obtained from petroleum and natural gas are called ' petrochemicals '.

Petrochemicals are used in manufacturing:

Synthetic fibres (such as Polyester, Nylon, Acrylic etc.),

Detergents,

Polythene, and

Man-made plastics.

Natural gas also yields Hydrogen gas which is used in the production of fertilisers (such as urea).

Natural Gas

Figure 12 Natural Gas

Natural gas is a fossil fuel found naturally as a hydrocarbon gas mixture in the oil wells. Its main component is methane but it may also contain varying amounts of other higher alkanes (a group of elements). Gases like carbon dioxide, helium, nitrogen, and hydrogen sulphide are also found in natural gas in small percentages.

Why is Natural Gas important as a fossil fuel?

Natural gas is considered important as this fossil fuel can easily be transported through pipes.

It is stored as CNG which is used for several purposes and is also used as a starting material for manufacturing many chemicals and fertilisers.

Natural Gas does not cause pollution and has high calorific value.

Compressed Natural Gas (CNG) is the natural gas stored under high pressure.

Why is CNG useful?

CNG is used as:

Fuel to generate power

Cleaner fuel for transport vehicles (less polluting than petrol and diesel)

Fuel in homes and industries which can be supplied through pipes.

CNG pipeline network already exists in Vadodara in Gujarat, some parts of Delhi and some other places.

Why is CNG considered as a cleaner fuel?

Natural gas is considered a better fuel than coal and petroleum because it is cleaner.

This means that it results in less amount of pollution that the other fossil fuels.

Natural gas emits 50% less carbon dioxide, sulphur and nitrogen oxides in the air.

However, it is not the best solution as there are better sources of energy present nowadays like solar energy.

Some Natural Resources are Limited

Fossil fuels, such as coal, petroleum, and natural gas cannot be created in the laboratory as it is not possible to create the natural conditions under which they are formed. Moreover, it takes thousands of years for them to be formed.

Consequences of the burning of fossil fuels

Increase in air pollution: The burning of fossil fuels results in the release of unburnt carbon particles in the air. These particles act as pollutants and increase air pollution. Fossil fuels release poisonous gases such as carbon monoxide and sulphur dioxide in the atmosphere.

Global Warming: Fossil fuels when burnt release large amounts of carbon dioxide in the air. As the amount of carbon dioxide increases it results in an increase in the global temperature of the earth and leads to global warming.

Why should we use fossil fuels economically?

They are available in limited quantities.

Burning these fuels also cause air pollution as well as global warming.

Hence, we should use these fuels economically to make sure that we can use them for a longer time, the risk of global warming gets reduced, and we can live in a cleaner environment.

How can we save petrol or diesel while driving?

According to the Petroleum Conservation Research Association (PCRA) in India, we can save petrol or diesel while driving by:

Drive at a constant and moderate speed.

Maintain tyre pressure at correct levels.

Switch off the engine when you are waiting( such as traffic light).

Do regular maintenance of your vehicle.

Why fossil fuels can last for 100 years only?

Fossil fuels are exhaustible resources which mean that they are not present in abundant quantities on the earth.

They take hundreds and thousands of years to replenish.

The rate at which they are being consumed today is increasing at a rapid pace.

It means that more amounts of fossil fuels are being used than it is being replenished.

Hence, scientists claim that they can replenish completely in 100 years.

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NCERT Solutions for Chapter 5 Coal and Petroleum Class 8 Science

The following Table shows the total power shortage in India from 1991 - 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

NCERT Solutions for Chapter 4 The Age of Industrialisation Class 10 History

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CBSE Class 8th Science Value Based Questions Chapter 5 Coal and Petroleum PDF Download

CBSE Class 8th Science Value Based Questions Chapter 5 Coal and Petroleum are the easiest questions which you see in your question paper and the scoring one all student who attempt it surely get they are just little bit difficult and examine your basic knowledge regarding the particular chapter. Science Value Based Questions for Class 8th are available here at Free of cost. These questions are expected to be asked in the Class 8th board examination. These Science Value Based Questions are from complete CBSE Syllabus.

CBSE Class 8th Science Value Based Questions Chapter 5 Coal and Petroleum

Most of these Science Value Based Questions are quite easy and students need only a basic knowledge of the chapter to answer these questions. Download CBSE Science Value Based Questions for board examinations. These Science Value Based Questions are prepared by Directorate of Education, Delhi.

CBSE Science Value Based Questions Class 8th Chapter 5 Coal and Petroleum PDF

The purpose of the Science Value Based Questions is to make students aware of how basic values are needed in the analysis of different situations and how students require to recognize those values in their daily lives. Some questions are subject related. But even if they are not, that one-minute awareness of what we write about value without any specific preparation is a good step indeed.

CBSE Science Value Based Questions for Class 8th Chapter 5 Coal and Petroleum download here in PDF format. The most CBSE Science Value Based Questions for annual examination are given here for free of cost. The additional questions for practice the Class 8th exam are collected from various sources. It covers questions asked in previous year examinations.

CBSE Science Value Based Questions for Class 8th Chapter 5 Coal and Petroleum Free PDF

Class 8th books have many questions. These questions are regularly asked in exams in one or other way. Practising such most CBSE Science Value Based Questions Chapter 5 Coal and Petroleum certainly help students to obtain good marks in the examinations.

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NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum

NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum are given below. Here we have provided the best and error-free answers to all the exercise questions that will strengthen your foundation in science. Solving NCERT questions will assist you in grasping the content in the Crop Production and Management chapter in a better way.

In these solutions, we have answered all the intext and exercise questions provided in NCERT class 8 science textbook. NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum provided in this article are strictly based on the CBSE syllabus and curriculum. Students can easily download these solutions in PDF format for free or can read them online.

Coal and Petroleum Class 8 Science NCERT Solutions

Exercise Questions

Question 1: What are the advantages of using CNG and LPG as fuels?

Answer: The advantages of using CNG and LPG as fuels are:

CNG and LPG burn easily.
CNG and LPG give a lot of heat energy when burnt.
CNG and LPG can be transported easily through pipelines.
CNG and LPG are clean fuels and they do not release smoke when burnt.

Question 2: Name the petroleum product used for surfacing of roads.

Answer: Bitumen is the petroleum product used for surfacing of roads.

Question 3: Describe how coal is formed from dead vegetation. What is this process called?

Answer: Millions of years ago, dense forests got buried under the soil due to natural processes like storms, floods, and earthquakes. These got compressed as more and more soil got deposited over them. When they got buried deep in the soil, they were exposed to very high pressure and temperature. Under these conditions, these slowly got converted into coal. This process of formation of coal from dead vegetation is called carbonization.

Question 4: Fill in the blanks:

(a) Fossil fuels are ____________, ____________, and ____________ .

(b) Process of separation of different constituents from petroleum is called _____________ .

Answer: (a) Fossil fuels Coal, Petroleum , and natural gas .

(b) Process of separation of different constituents from petroleum is called refining .

Question 5: Tick True/False against the following statements.

(a) Fossil fuels can be made in the laboratory. (T/F)

(b) CNG is more polluting fuel than petrol. (T/F)

(d) Coal tar is a mixture of various substances. (T/F)

(e) Kerosene is not a fossil fuel. (T/F)

Answer: (a) False (b) False (c) True (d) True (e) False

Question 6: Explain why fossil fuels are exhaustible natural resources.

Answer: Fossil fuels require millions of years to form from the dead vegetation and animals that get buried deep inside the Earth. They require high temperature and pressure for their formation, which cannot be provided in the laboratory. Thus, fossils are limited. Therefore, the use of fossil fuels at this rate will lead to their exhaustion.

Question 7: Describe characteristics and uses of coke.

Answer: Coke is a tough porous and black substance. It is produced by destructive distillation of coal.

It is an almost pure form of carbon.
It is used as domestic as well as industrial fuel in stoves and furnaces.
It is used in the manufacture of steel.
It gives little or no smoke.
It is used for the extraction of metals.
It can be used to make fuel gases.

Question 8: Explain the process of formation of petroleum.

Answer: Petroleum is formed by the burial of aquatic plants and animals below the sea bed. The marine animals and plants died thousands of years ago and settled down in the bottom of the sea. In anaerobic conditions, microorganisms decompose this organic matter. Due to high pressure and heat, the dead remains of tiny plants and animals were slowly converted into petroleum.

Question 9: The following table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

CBSE Class 8 NCERT solutions Science Chapter 5 PDF

Below we have listed the topics discussed in NCERT Solutions for Class 8 Science Chapter 5. The list gives you a quick look at the different topics and subtopics of this chapter.

NCERT Solutions for Class 8 Science Chapter 5 – A Brief Discussion

CBSE Class 8 Science NCERT Solutions Chapter 5 helps students to clear their doubts and to score good marks in the board exam. All the questions are solved by experts with a detailed explanation that will help students complete their assignments & homework. Having a good grasp over CBSE NCERT Solutions for Class 8 Science will further help the students in their preparation for board exams and other competitive exams such as NTSE, Olympiad, etc.

NCERT Class 8 Science Chapter 5 Coal and Petroleum | Important Questions

by Manjusha · September 30, 2021

Here are important questions from NCERT Class 8 Science Chapter 5 Coal And Petroleum. Multiple Choice Questions from this chapter can be found here.

1. What are natural resources?

These are materials obtained from nature. Examples: land, air, water

2. What are the two kinds of natural resources?

Exhaustible resources and inexhaustible resources

3. What are inexhaustible natural resources?

These are materials present in nature in unlimited quantity. These resources are unlikely to be exhausted by human activities. Examples are: sunlight and air

4. What are exhaustible natural resources?

These are natural resources that are available only in a limited quantity. Excessive consumption of these resources will exhaust them. Examples are: forest, coal, petroleum, wildlife etc.

5. How were coal and petroleum formed?

They were formed from the dead remains of living organisms (fossils).

6. Why are coal and petroleum called fossil fuels?

Coal and petroleum were formed from the dead remains or fossils of living organisms. Hence, they are called fossil fuels.

7. What are some uses of coal?

Coal is one of the fuels used for cooking food. Earlier, coal was used in railway engines to produce the steam that would run the train. Coal is also used in thermal power plants to produce electricity. In addition, there are many other industries that use coal as a fuel.

8. How were coal deposits formed?

Around 300 million years ago, there were dense forests in many low lying areas. Due to natural disasters like flooding, many of these forests got submerged in water and was later buried under the soil. Over the years more and more soil got deposited over them and they were compressed. As they sank deeper and deeper, the temperature also rose. Under high pressure and temperature, these dead plants got converted to coal.

9. What is carbonization?

Coal mainly contains carbon. The slow process of conversion of dead plants into carbon rich coal is called carbonization.

10. Name some products obtained from coal?

Coke, coal tar and coal gas

11. What is coke?

Coke is a product obtained by processing coal. It is a tough, porous and black substance. It is an almost pure form of carbon and is used in the manufacture of steel and in the extraction of several metals.

12. What is coal tar?

It is a product obtained by processing coal. It is a black and thick liquid. Coal tar is a mixture of nearly 200 substances. Products obtained from coal tar are used for manufacturing substances like synthetic dyes, drugs, plastics, explosives, paints, roofing materials etc.

13. What is coal gas?

Coal gas is a product obtained during the processing of coal to get coke. It is a fuel for many industries.

14. How was petroleum formed?

Petroleum was formed from sea organisms. As they died, their bodies got deposited at the bottom of the sea. Over years, they got covered by sand and clay. These dead organisms were transformed into petroleum and natural gas over millions of years due to absence of air, high temperature and high pressure.

15. Name the main constituents of petroleum

The main constituents of petroleum are petrol, diesel, lubricating oil, paraffin wax etc.

16. What is refining?

Refining is the process of separating various constituents of petroleum. It is carried out in a petroleum refinery.

17. What are petrochemicals?

These are useful substances obtained from petrol and natural gas.

18. Name some uses of petrochemicals?

Petrochemicals are used in the manufacture of detergents, fibres, polythene and other plastics. Hydrogen obtained from natural gas is used for manufacturing the fertiliser urea.

19. Why is natural gas an important fossil fuel?

Natural gas is an important fuel because it has various uses. It is less polluting than petrol or diesel and hence it is now widely used as a fuel for transport vehicles. It can be transported easily through pipes. It is stored under high pressure as compressed natural gas (CNG). One of the biggest advantages of CNG is that it can be used directly for burning in homes and factories. Natural gas is also used as a starting material for the manufacture of various chemicals and fertilisers.

20. Why should we limit the use of coal and petroleum?

Coal and petroleum are exhaustible natural resources. That means their supply is limited. It took dead organisms millions of years to get converted into fossil fuels. The available reserves of these fuels will last only a few hundred years and hence we have to limit our consumption of fossil fuels. Also, the burning of fossil fuels is one of the biggest causes of air pollution. They also contribute to global warming. By simply limiting our consumption of these fossils we can conserve them for longer periods and also improve our air quality.

21. List some ways to save petrol or diesel while driving

Drive at a constant and moderate speed.
At traffic lights or at other places where you have to halt, switch off the engine.
Make sure that tyre pressure is correct.
Ensure regular maintenance of the vehicle.

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NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum

Ncert solutions class 8 science chapter 5 – free pdf download.

*According to the latest update on the CBSE Syllabus 2023-24, this chapter has been removed.

NCERT Solutions for Class 8 Chapter 5 Coal and Petroleum is prepared for the benefit of Class 8 students. They cover the CBSE Syllabus (2023-24) and comprise answers to the questions for Class 8 Science Chapter 5. This solution guides you in your exam preparation and helps you to understand the topic thoroughly. To score good marks in the examinations, students should solve the NCERT questions Class 8 Science provided at the end of each chapter. Class 8 is one of the important phases of a student’s life. Students learn many new topics in Class 8, which are the basis for the topics included in higher classes.

Download Exclusively Curated Chapter Notes for Class 8 Science Chapter – 5 Coal and Petroleum

Download most important questions for class 8 science chapter – 5 coal and petroleum.

These NCERT Solutions for Class 8 Science Chapter 5 have answers to questions on coal, petroleum and natural gas and other fossil fuels, the formation of fossil fuels, types of fossil fuels, uses of fossil fuels and limitations of using fossil fuels. These NCERT Class 8 Solutions are prepared systematically by experienced teachers, which will not only help you in your exam preparation but also help you understand the topic in-depth.

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Access Answers to Science NCERT Class 8 Chapter 5 Coal and Petroleum

Exercise Questions

1. What are the advantages of using CNG and LPG as fuels?

The advantages of using CNG and LPG as fuels are as follows:

CNG and LPG burn easily.
CNG and LPG give a lot of heat energy when burnt.
CNG and LPG can be transported easily through pipelines.
CNG and LPG are clean fuels and they do not release smoke when burnt.

2. Name the petroleum product used for surfacing of roads.

Bitumen is used for surfacing of roads.

3. Describe how coal is formed from dead vegetation. What is this process called?

Dense forests got buried under the soil due to natural processes, millions of years ago. More and more soil got deposited over them and they got more compressed. This led them to get exposed to very high temperature and pressure. They slowly got converted into coal under these extreme conditions. The whole process of formation of coal from dead vegetation is known as carbonization.

4. Fill in the blanks.

(a) Fossil fuels are ____________, ____________, and ____________ .

(b) The process of separation of different constituents from petroleum is called _____________ .

(a) Fossil fuels Coal, Petroleum , and natural gas .

(b) The process of separation of different constituents from petroleum is called refining .

5. Tick True/False against the following statements.

(a) Fossil fuels can be made in the laboratory. (T/F)

(b) CNG is a more polluting fuel than petrol. (T/F)

(d) Coal tar is a mixture of various substances. (T/F)

(e) Kerosene is not a fossil fuel. (T/F)

6. Explain why fossil fuels are exhaustible natural resources.

The process of formation of fossil fuels requires millions of years. Dead vegetation and animals that get buried deep inside the earth require high temperature and pressure for the formation of fossil fuels, which cannot be done in the laboratory. Thus, fossils are limited. Therefore, the use of fossil fuels at a rapid rate will lead to their exhaustion.

7. Describe the characteristics and uses of coke.

Characteristics:

i) Coke is tough.

ii) Coke is porous.

iii) Coke is black in colour.

i) In the manufacture of steel.

ii) In the extraction of metals (as a reducing agent).

8. Explain the process of the formation of petroleum.

Dead organisms that got buried in the sea millions of years ago got covered with layers of sand and clay. Due to lack of air, high temperature and high pressure, these dead organisms got transformed into petroleum and natural gas.

9. The following table shows the total power shortage in India from 1993–1999. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

Image showing the total power shortage in India

Class 8 Science NCERT Solutions for Chapter 5 Coal and Petroleum

Solving the NCERT questions will help you to understand the chapter in an effective way. Sometimes NCERT questions are directly asked in the school examinations. NCERT Solutions ensure that the students learn the topic and clear all their doubts.

NCERT books are outlined in such a way that every student is capable of understanding the concepts. These textbooks are written and closely reviewed by experts before being published. There are a few segments at the end of each chapter termed as – Keywords, what have you learned, exercises, extended learning, projects and activities. These projects and activities help students enhance their learning capability.

4 sub-units of Class 8 Chapter 5 Coal and Petroleum

Coal – Story of coal – coke – coal tar – coal gas
Petroleum – refining of petroleum – – definition of petroleum
Natural gas
Some natural resources are limited

List of important keywords to pay attention

Fossil fuel
Petroleum refinery

Studying NCERT Solutions is as important as studying notes and other study materials. NCERT Solutions help you to understand the topic clearly, which aids in better preparation for the examination.

Frequently Asked Questions on NCERT Solutions for Class 8 Science Chapter 5

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Chapter 5: Coal and Petroleum

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Chapter 5: Coal and Petroleum

Class: VIII

Exemplar Solutions

Multiple Choice Questions

Question 1. Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?

(a) minerals (c) soil

(b) water (d) plastic

Answer 1. (d)

Question 2. Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?

(a) coal (c) sun-light

(b) petroleum (d) minerals

Answer 2. (c)

Question 3. Which of the following is a pair of exhaustible natural resources.

(a) coal and soil (c) water and petroleum

(b) air and sun-light (d) wild life and minerals

Answer 3. (d)

Question 4. Coal is processed in industries to get some useful products. Which of the following is not obtained from coal?

(a) coke (c) coal gas

(b) coal tar (d) CNG

Answer 4. (d)

Question 5 . Exhaustible natural resources are:

(a) unlimited in quantity.

(b) not dependent on nature.

(d) not exhausted by human activities.

Answer 5. (c)

Question 6 . Fossil fuels are obtained from:

(a) remains of non-living materials.

(b) dead remains of birds only.

(d) dead remains of living organisms.

Answer 6. (d)

Question 7. Coal is formed from the remains of

(a) vegetation only (c) both vegetation and animals

(b) animals only (d) neither vegetation nor animals

Answer 7. (a)

Question 8. Which substance is formed by the carbonisation of dead vegetation?

(a) coal (c) coal gas

(b) coke (d) coal tar

Answer 8. (a)

Question 9. Naphthalene balls are obtained from coal tar and are used as

(a) mosquito repellent (c) moth repellant

(b) honey bee repellent (d) snake repellant

Answer 9. (c)

Question 10. Which of the following is not a constituent of petroleum?

(a) paraffin wax (c) petrol

(b) lubricating oil (d) coke

Answer 10. (d)

Question 11. Petroleum was formed from organisms:

(a) living on the land (c) living in the sea

(b) living on the plants (d) living on the rocks

Answer 11. (c)

Question 12. Choose the correct statement from the following:

(a) It is difficult to transport natural gas through pipes.

(b) The disadvantage of natural gas is that it can not be used directly for burning in homes.

(d) Natural gas cannot be used for power generation.

Answer 12. (c)

VERY SHORT ANSWER QUESTIONS

Question 13. You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?

Answer 13. Decantation

Question 14. What does CNG stand for and why is it considered to be a better fuel than petrol?

Answer 14. CNG stands for Compressed Natural Gas. It is considered to be a better fuel because it is less polluting.

Question 15. Name the petroleum product used as fuel for stoves, lamps and jet aircrafts.

Answer 15. Kerosene is used as fuel for stoves, lamps and jet aircrafts.

Question 16. Fill in the blanks in the following sentences.

(a) Coal is one of the ________ used to cook food.

(b) When heated in air, coal burns and produces mainly ________ gas.

(d) Petroleum, ________ and ________ are fossil fuels.

(e) Forests and coal are ________ natural resources.

Answer 16. (a) fuels (d) coal, natural gas

(b) carbon dioxide (e) exhaustible

Question 17. The underlined words in the following sentences have been jumbled up. Write them in their correct form.

(a) Loca is obtained from mines.

(b) Umpetlore is a fossil fuel.

(d) Keenrose is a fuel used in jet crafts.

(e) Nutsgilh is an example of inexhaustible natural resources.

Answer 17. (a) coal (b) petroleum (c) refinery (d) kerosene (e) sunlight

Question 18. Fill in the blanks.

(a) The slow process of conversion of dead vegetation into coal is called__________.

(b) Coal and petroleum are formed from the dead remains of organisms and are known as __________.

(d) During the processing of coal to get coke, coal tar and __________ are also obtained.

(e) The process of separating the various constituents of petroleum is known as __________.

(f) Excessive burning of fossil fuels is a major cause of __________.

Answer 18. (a) carbonisation, (b) fossil fuels, (c) unpleasant,

(d) coal gas, (e) refining, (f) air pollution.

Question 19. Write True/False against the following statements.

(a) Oxygen in air is an exhaustible natural resource.

(b) Resources which are present in unlimited quantity in nature are called exhaustible natural resources.

(d) Under high temperature and pressure, dead plants get slowly converted to coal.

(e) CNG is less polluting fuel than petrol and diesel.

Answer 19. (a) False, (b) False, (c) True, (d) True, (e) True.

SHORT ANSWER QUESTIONS

Question 20. Sunlight and air are inexhaustible natural resources. Comment.

Answer 20. These resources are present in unlimited quantity in nature and are not likely to be exhausted by human activities.

Question 21. Some natural resources are given in a box. Classify them into the exhaustible and inexhaustible natural resources.

air, coal, natural gas, sunlight, petroleum, minerals, forests, oxygen.

Answer 21.

Exhaustible natural resources are coal, natural gas, petroleum, minerals, forests.

Inexhaustible natural resources are air, sunlight, oxygen.

Question 22. Write two important uses of coke.

Answer 22. . It is used for extraction of many metals and also for the manufacture of steel.

Question 23. Write the characteristics and some important uses of coal.

Answer 23. Coal is black in colour and hard as stone. It is one of the fuels used to cook food. Earlier it was used in railway engines to produce steam to run the engine. It is used as fuel in thermal power plants to produce electricity and in various other industries.

Question 24. Look at Fig. 5.1 where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer?

Answer 24. Hint: Oil is lighter than water hence floats over it.

Question 25. Fill in the blanks and complete the story.

About 300 million years ago the earth had dense ________ in low lying wetland areas. Due to natural processes, like ______, these forests got burried under the ________. As more ________ deposited over them, they were compressed. The ________ also rose as they sank deeper and deeper. Under high ________ and high ________, dead plants got slowly converted into coal.

Answer 25. forests, floods, soil, soil, temperature, pressure, temperature.

Question 26. Match the items given in Column I with the items of Column II.

Answer 26. (a)–(iii), (b)–(iv), (c)–(i), (d)–(ii)

Long Answer Questions

Question 27. Name the products obtained and their uses when coal is processed in industry.

Answer 27. Coal when processed in industry gives coke, coal tar and coal gas.

Coke is used in the manufacture of steel and in extraction of many metals.

Coal tar is used as starting material for manufacturing various sustances such as synthetic dyes, drugs, explosives, perfumes, paints etc.

Coal gas is used as fuel.

Question 28. We say fossil fuels will last only for a few hundred years. Comment.

Answer 28. It takes a very long time for the formation of fossil fuels. It also requires specific conditions and it doesn’t happen quite often. Therefore, their limited stock will last only for a few hundred years.

Question 29. We read in newspapers that burning of fuels is a major cause of global warming. Explain why.

Answer 29 . Hint: It is related to global warming due to formation of carbon dioxide and some other gases.

Question 30. While driving what are the tips we must follow to save petrol/ diesel/natural gas?

Ensure correct tyre pressure.
Ensure regular maintenance of the vehicle.
Drive at a constant and moderate speed.
Switch off the engine at traffic lights or at a place where you have to wait.

Questuion 31. Imagine that all the exhaustible natural resources are exhausted by human activities. Do you think survival of living beings would be possible.? If yes, why?, If not, why not?

Answer 31. This is an open ended question. Let children imagine and write.

Question 32. Why petrol is exhaustible natural resource, whereas sunlight is not? Explain.

Answer 32. Hint: Sunlight is present in unlimited quantity in nature whereas it takes millions of years to form petrol from dead remains of organisms.

Questuion 33. Write some important uses of the various constituents of petroleum.

Petroleum gas in liquid form (LPG) — used as fuel for home and industry.
Petrol — used as fuel for automobile and aviation.
Kerosene — used as fuel for stoves, lamps and for jet aircrafts.
Diesel — used as fuel for heavy motor vehicles, electric generators.
Lubricating oil — used for lubrication
Praffin wax — used in ointments, candles, vaseline etc.
Bitumen — used in paints and road surfacing.

Question 34. Coal reserves are said to be enough to last for another hundred years. Do you think we need to worry in such case? Why or why not?

Answer 34. Open ended question. Let children write their views.

Question 35. What steps would you suggest for the judicious use of fossil fuels?

Answer 35. Open ended questions. Let children write their ideas

Question 36. Complete the crossword Fig. 5.2 with the help of the clues.

Fuels obtained form dead remains of living organisms. (6,5)
A process by which the various constituents of petroleum are separated. (8)
A porous black substance obtained form coal. (4)
Another name for motor fuel. (6)
The substance obtained by carbonisation. (4)
Fuel for heavy motor vehicles. (6)
A petroleum product used for road surfacing. (7)
Dead remains of sea animals got converted into it. (9)

Other Chapters

Chapter 1: Crop Production and Management
Chapter 2: Microorganisms: Friend and Foe
Chapter 3: Synthetic Fibres and Plastics
Chapter 4: Materials - Metals and Non- Metals
Chapter 6: Combustion and Flame
Chapter 7: Conservation of Plants and Animals
Chapter 8: Cell - Structure and Functions
Chapter 9: Cell - Reproduction in Animals
Chapter 10: Cell – Reaching the age of Adolescence
Chapter 11: Force and Pressure
Chapter 12: Friction
Chapter 13: Sound
Chapter 14: Chemical Effects of Electric Current
Chapter 15: Some Natural Phenomena
Chapter 17: Stars and The Solar System
Chapter 18: Pollution of Air and Water

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NCERT Solutions for Class 8 Science Chapter 3 Coal and Petroleum

8th June 2023

NCERT Solutions for Class 8 Science Chapter 3 Coal and Petroleum help students to clear all their doubts. These solutions provide you with the answers to all the questions given in the NCERT textbook. CBSE Class 8 Science Chapter 3 Solutions is prepared by expert teachers as per the latest CBSE syllabus and guidelines.

Solving NCERT Solutions will help you to understand the concepts related to Coal and Petroleum. NCERT Solutions for Class 8 Science Chapter 3 contains an in-depth explanation of each question of NCERT Science textbook. These solutions cover important concepts in different patterns like MCQs and short answer questions, worksheets and more and help you top score good marks in the exam.

Class 8 Science Coal and Petroleum Questions and Answers

Exercise Questions

Question 1: What are the advantages of using CNG and LPG as fuels?

Answer: The advantages of using CNG and LPG as fuels are:

They are used as non-polluting fuels to transport vehicles.
LPG and CNG both are easy to store and transport.
CNG is used for power generation.
These fuels have more energy per unit volume.
LPG can be used directly for burning in homes and factories.
These are easily available and have affordable cost.
LPG and CNG has virtually no ash particles left after burning.

Question 2: Name the petroleum product used for surfacing of roads.

Answer: Bitumen is the petroleum product used for surfacing of roads.

Question 3: Describe how coal is formed from dead vegetation. What is this process called?

Answer: About 300 million years ago the earth had dense forests in low lying wetland areas. Due to natural processes, like flooding, these forests got buried under the soil. As more soil deposited over them, they were compressed. The temperature also rose as they sank deeper and deeper. Under high pressure and high temperature, dead plants got slowly converted to coal. As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonisation.

Question 4: Fill in the blanks. (a) Fossil fuels are ____________, ____________, and ____________ . (b) Process of separation of different constituents from petroleum is called _____________ . (c) Least polluting fuel for a vehicle is ______________ .

Answer: (a) Fossil fuels Coal, Petroleum , and natural gas . (b) Process of separation of different constituents from petroleum is called refining . (c) Least polluting fuel for a vehicle is Compressed Natural Gas (CNG).

Question 5. Tick True/False against the following statements. (a) Fossil fuels can be made in the laboratory. (T/F) (b) CNG is more polluting fuel than petrol. (T/F) (c) Coke is the almost pure form of carbon. (T/F) (d) Coal tar is a mixture of various substances. (T/F) (e) Kerosene is not a fossil fuel. (T/F)

Answer: a) False b) False c) True d) True e) False

Question 6: Explain why fossil fuels are exhaustible natural resources.

Answer: Fossil fuels are formed over a period of millions of years, by the action of high temperature and high pressure on the remains of dead plants and animals. These fossil fuels are exhaustible natural resources because if these are exhausted by human activities, cannot be recreated in a short period of time.

Question 7: Describe characteristics and uses of coke.

Answer 7: Coke is a tough porous and black substance. It is produced by destructive distillation of coal.

It is an almost pure form of carbon.
It is used as domestic as well as an industrial fuel in stoves and furnaces.
It is used in the manufacture of steel.
It gives little or no smoke.
It is used for extraction of metals.
It can be used to make fuel gases.

Question 8: Explain the process of formation of petroleum.

Answer: Petroleum was formed from organisms living in the sea. As these organisms died, their bodies settled down at the bottom of the sea and got covered with sand and clay. The absence of air, high pressure and high temperature for over millions of years transformed the dead organisms into petroleum and natural gas. The petroleum deposits are usually found mixed with salt water. The petroleum is lighter than salt water, and hence, floats over it.

MCQ Questions for Class 8 Science Chapter 5 Coal and Petroleum with Answers

We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 5 Coal and Petroleum with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Coal and Petroleum Class 8 MCQs Questions with Answers here along with a detailed explanation.

Coal and Petroleum Class 8 MCQs Questions with Answers

Choose the correct option.

Question 1. Which of the following is a renewable source of energy? (a) Coal (b) Petroleum (c) Water (d) Natural gas

Answer: (c) Water

Question 2. Which of the following is a non-renewable source of energy? (a) Water (b) Coal (c) Soil (d) Sun

Answer: (b) Coal

Coal and Petroleum with Questions and Answers

Question 3. Plastic is a (a) natural material (b) man-made material (c) both (a) & (b) (d) none of these

Answer: (b) man-made material

Question 4. Fossil fuels are (a) coal (b) petroleum (c) natural gas (d) all of the these

Answer: (d) all of the these

Question 5. The word ‘coal’ is derived from the old English term (a) col (b) coke (c) coco (d) none of these

Answer: (a) col

Question 6. Which of the following minerals is present in coal? (a) Hydrogen (b) Oxygen (c) Sulphur (d) All of these

Answer: (d) All of these

Question 7. Naphthalene balls are used as (a) mosquito repellant (b) moth repellant (c) snake repellant (d) bee repellant

Answer: (b) moth repellant

Question 8. How much percentage of carbon is present in bituminous? (a) 20 — 25% (b) 25 — 35% (c) 65 — 85% (d) 98%

Answer: (c) 65 — 85%

Question 9. The process of conversion of wood into coal is called (a) carbonisation (b) catagenesis (c) carboniferous (d) none of these

Answer: (a) carbonisation

Question 10. Petroleum is also known as (a) coke (b) black gold (c) tar (d) none of these

Answer: (b) black gold

Question 11. The brown variety of coal is (a) lignite (b) peat (c) anthracite (d) bituminous

Answer: (a) lignite

Question 12. The major constituent of natural gas is/are (a) butane (b) methane (c) hydrogen (d) ethane

Answer: (b) methane

Question 13. The product obtained by destructive distillation of coal is (a) coal tar (b) coke (c) coal gas (d) all of these

Answer: (d) all of these

Question 14. The petroleum product which is not used as fuel is (a) petrol (b) kerosene (c) diesel (d) petroleum jelly

Answer: (d) petroleum jelly

Question 15. Main constituent of LPG is (a) methane (b) butane (c) ethane (d) propane

Answer: (b) butane

Question 16. A natural gas stored under high pressure is called (a) CNG (b) LPG (c) KLG (d) PNP

Answer: (a) CNG

Question 17. Name the petroleum product used for surfacing of road. (a) Peat (b) Bitumen (c) Lignite (d) Anthracite

Answer: (b) Bitumen

Question 18. The mining of oil under sea is termed as (a) distillation (b) carbonisation (c) shore mining (d) destructive distillation

Answer: (c) shore mining

Question 19. Which is the best type of coal? (a) Lignite (b) Anthracite (c) Bituminous (d) Peat

Answer: (b) Anthracite

Question 20. Petroleum is separated by using the difference in (a) ignition temperatures (b) melting points (c) freezing points (d) boiling points

Answer: (d) boiling points

Question 21. What should be the minimum age for the dead remains of organisms to be categorised as fossil? (a) 100 years (b) 1,000 years (c) 10,000 years (d) 100,000 years

Answer: (c) 10,000 years

Question 22. The HVJ pipeline starts from which state? (a) Gujarat (b) Madhya Pradesh (c) Haryana (d) Uttar Pradesh

Answer: (d) Uttar Pradesh

Question 23. An example of fossil fuel is (a) wood (b) petroleum (c) coal (d) all of these

Question 24. Which substance is used for making candles? (a) Petrol (b) Paraffin wax (c) Lubricating oil (d) Kerosene

Answer: (b) Paraffin wax

Question 25. The petroleum product which is not used as a fuel is (a) petrol (b) kerosene (c) diesel (d) petroleum jelly

Question 26. When coal burns in air (a) carbon dioxide is formed (b) sulphur dioxide is formed (c) carbon monoxide is formed (d) hydrogen gas is formed

Answer: (a) carbon dioxide is formed

Question 27. Which of the following is a natural resource? (a) Tea (b) Cooked food (c) Air (d) Toffee

Answer: (c) Air

Question 28. Inexhaustible natural resources in nature are (a) limited (b) unlimited (c) scarce (d) not present

Answer: (b) unlimited

Question 29. Which of the following is an exhaustible natural resource? (a) Air (b) Water (c) Sunlight (d) Forest

Answer: (d) Forest

Question 30. Fossils are the (a) dead remains of living organism (b) coal mines (c) kind of natural resource (d) living beings

Answer: (a) dead remains of living organism

Question 31. Coal mainly contains (a) hydrogen (b) oxygen (c) carbon (d) sodium

Answer: (c) carbon

Question 32. Which of the following places has a network of pipelines which supply CNG? (a) Kanpur (b) Jhansi (c) Vadodara (d) Bhopal

Answer: (c) Vadodara

Question 33. What is the full form of PCRA? (a) Petroleum Conservation Research Association (b) Petroleum Consumption Research Association (c) Petroleum Conservation Resource Association (d) Petrochemical Consumption Research Association

Answer: (a) Petroleum Conservation Research Association

Question 34. Hydrogen gas is mainly obtained from (a) petroleum (b) coal (c) coke (d) natural gas

Answer: (d) natural gas

Fill in the blanks with suitable word/s.

Question 1. Resources which get replenished by natural processes in a certain period of time is called …………….

Answer: renewable resources

Question 2. ……………. is a mixture of various constituents such as lubricating oil, paraffin wax, etc.

Answer: Petroleum

Question 3. All the things that are required to fulfil one’s need are called …………….

Answer: resources

Question 4. Anything that burns to produce energy is called a …………….

Answer: fuel

Question 5. ……………. is a black-coloured hard substance that mainly contains carbon.

Answer: Coal

Question 6. The time period taken to complete the process of carbonisation is called …………….

Answer: carboniferous age

Question 7. ……………. is the most inferior and softest form of coal.

Answer: Peat

Question 8. The least polluting fuel for vehicle is …………….

Answer: CNG

Question 9. The major fossil fuels are ……………. and …………….

Answer: coal, petroleum

Question 10. The major component of CNG is …………….

Answer: methane

Question 11. Destructive distillation of coal is done at …………….

Answer: 1000°C

Question 12. Petroleum is a mixture of different …………….

Answer: hydrocarbons

Question 13. …………… is another name for petroleum.

Answer: Black gold

Question 14. Devices that consume less energy are ……………. and ……………. lights.

Answer: CFL, LED

Question 15. Forests are ……………. natural resources.

Answer: exhaustible

Question 16. Petra means and oleum means …………….

Answer: rock, oil

Question 17. ……………. is the leading producer of crude oil.

Answer: Saudi Arabia

Question 18. When heated in air, coal burns and produces mainly ……………. gas.

Answer: carbon dioxide

Question 19. We should use ……………. instead of individual vehicles.

Answer: carpools

Question 20. Separation of different constituents of petroleum is called …………….

Answer: refining of petroleum

Question 21. Air is an ………………….. natural resource.

Answer: inexhaustible

Question 22. Fossil fuels are valuable sources of …………………..

Answer: energy

Question 23. When coal is heated in the ………………….. of air, many useful products are formed.

Answer: absence

Question 24. When coal is burnt in the ………………….. of oxygen, lot of smoke and harmful gases are produced.

Answer: Presence

Question 25. Useful substances obtained from petroleum and natural gas are called …………………..

Answer: petrochemicals

Question 26. The constituent of petroleum added to produce Vaseline is …………………..

Answer: paraffin wax

Question 27. Process of conversion of wood to carbon is called …………………..

Answer: carbonisation

Question 28. Process of separating the fractions of petroleum by fractional distillation is called ………………….. of petroleum.

Answer: refining

True or False

Question 1. Coal is a renewable source of energy.

Answer: False

Question 2. Coal is a solid fossil fuel.

Answer: True

Question 3. Coke is almost a pure form of carbon.

Question 4. CNG is more polluting than petrol.

Question 5. 40% of electricity generation depends on coal.

Question 6. Carbon content of lignite is 25-35%.

Question 7. Fossil fuels are inexhaustible natural resources.

Question 8. We get napthalene ball from coal tar.

Question 9. The time period take to complete carbonisation is called carboniferous age.

Question 10. Peat is the hardest grade coal.

Question 11. Petroleum is also known as ‘black gold.’

Question 12. 30% of paraffins is present in petroleum.

Question 13. Petroleum can be mixed with water.

Question 14. Natural gas is transported through pipelines.

Question 15. Kerosene is not a fossil fuel.

Question 16. The percentage of carbon is more in coke than in coal.

Question 17. Petroleum is soluble in water.

Question 18. Petroleum is an exhaustible or non-renewable energy source.

Question 19. Ammoniacal liquor is formed by the solution of ammonia in oil.

Question 20. Natural gas is a domestic and industrial fuel with high calorific value.

Question 21. Oxygen is a non-renewable resource.

Question 22. Natural gas is found along with petroleum in reservoirs under the groun(d)

Question 23. Natural gas is chiefly made up of methane.

Question 24. CNG is used as a domestic fuel.

Question 25. Biogas is a very costly and inconvenient fuel for rural areas.

Match the following

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Case Study Questions for Class 8 Science Chapter 5 Coal and Petroleum
Here we are providing case study questions for CBSE Class 8 Science Chapter 5 Coal and Petroleum. Case Study Questions. Question 1: Read the passage carefully and answer the following questions. In the light of the availability of various resources in nature, natural resources can be broadly classified into two kinds- Inexhaustible and ...
Coal and Petroleum Class 8 Case Study Questions Science Chapter 3
Ans. Option (b) is correct. Explanation: An ideal fuel should have a high calorific value because calorific value of a fuel is the amount of heat liberated on complete burning of a unit mass or volume of a fuel. It is expressed in kJ/kg. Also read: Coal and Petroleum Assertion Reason Questions for Class 8 Science. Q. 2.
Coal and Petroleum Class 8 Extra Questions Science Chapter 5
Coal and Petroleum Class 8 Extra Questions Long Answer Questions. Question 1. Explain about the varieties of coal. Answer: Depending upon the amount of carbon content, coal may be of four types: Peat: This is the most inferior and softest form of coal. Its carbon content is very low. It has a large amount of moisture and is not much suitable to ...
Important Questions for CBSE Class 8 Science Chapter 5
Ans: Natural gas is preferred over petrol because it is a clean-burning fuel and produces less harmful substances into the air. Long Answer Questions: (5 Marks) 22. Explain in detail the products of coal. Ans: Coal is processed in the industry to get some useful products such as coke, coal tar and coal gas.
Class 8 Chemistry Chapter 5
5. COAL. 6. DIESEL. 7. BITUMEN. 8. PETROLEUM. CBSE Class 8 Science Chapter 5 MCQ Type Questions. 1. From the given statements, choose the incorrect one. (a) Petroleum gas in liquid form (LPG) is used as fuel in homes and industries (b) Kerosene is used as fuel for stoves, lamps and jet aircraft (c) Diesel is used as fuel for heavy motor ...
Coal and Petroleum Class 8 Science Extra Questions and Answers
Answer: LPG is a better fuel than coal because it is a cleaner fuel. Question 2: Name the petroleum product used for surfacing of roads. Answer: Bitumen, a petroleum product, is used for metalling the roads. Question 3: What are natural resources? Answer: Materials obtained from nature are called natural resources.
Coal and Petroleum Class 8 Important Questions and Answers
Answer: Coal is used to generate the electricity because it is reliable and low cost energy source. 19: Explain few advantages and disadvantages of using petroleum. Answer: Few advantage of using Petroleum as fuel and as raw materials are: Storage and transportation are simple.
NCERT Exemplar Class 8 Science Solutions Chapter 5 Coal and Petroleum
Petroleum, Coal are examples of fossil fuels. 7. Coal is formed from the remains of. (a) vegetation only. (b) animals only. (c) both vegetation and animals. (d) neither vegetation nor animals. Ans: (a) Coal is created through the disintegration of plants, trees, and soils over a lengthy period of time.
Coal and Petroleum Class 8 Notes
The uses of fractional distillation are that it enables component separation into different phases and purification of organic compounds. In coal and petroleum class 8 notes, the classification of natural resources, the formation of petroleum and coal and the refining of petroleum along with class 8 Science chapter 5 MCQs are discussed.
NCERT Solutions for Class 8 Science Chapter 5
Conclusion. NCERT Solutions for Class 8 Science Chapter 5 - "Coal and Petroleum" are invaluable resources that deepen students' understanding of these essential natural resources. The chapter explores the origin, formation, and extraction of coal and petroleum, shedding light on their significance in the energy sector.
NCERT Exemplar Class 8 Science Solutions for Chapter 5
NCERT Exemplar Solutions for Class 8 Science Chapter 5 Coal and Petroleum are a critical study resource for Class 8 students. This NCERT Exemplar will boost their preparation for Class 8 and various competitive examinations. After solving exemplar solutions, students will be able to better comprehend the concepts covered in CBSE Class 8 Chapter 5.
NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum
Answer. (a) Fossil fuels are coal, petroleum and natural gas. (b) Process of separation of different constituents from petroleum is called refining. (c) Least polluting fuel for vehicles is CNG. 5. Tick True/False against the following statements. (a) Fossil fuels can be made in the laboratory.
Coal and Petroleum CBSE Class 8 Science
Get Revision notes of Class 8 th Science Chapter 5 Coal and petroleum to score good marks in your Exams. Our notes of Chapter 5 Coal and petroleum are prepared by Maths experts in an easy to remember format, covering all syllabus of CBSE, KVPY, NTSE, Olympiads, NCERT & other Competitive Exams.
NCERT Solutions for Chapter 5 Coal and Petroleum Class 8 Science
NCERT Solutions for Chapter 5 Coal and Petroleum Class 8 Science. Book Solutions. 1. What are the advantages of using CNG and LPG as fuels? Answer. The advantages of using compressed natural gas (CNG) and liquified petroleum gas (LPG) as fuels are: → They can be burnt directly. → They can be transported easily through pipe lines.
NCERT Solutions for Class 8 Science Chapter 5 Materials Coal and Petroleum
Answer: Coal and petroleum are formed from the dead remains of living organisms that is why they are called fossils fuels. Question 5. Give two characteristics of coal. Answer: Coal is hard and is of black in colour. Question 6. Define destructive distillation.
CBSE Class 8th Science Value Based Questions Chapter 5 Coal and
The additional questions for practice the Class 8th exam are collected from various sources. It covers questions asked in previous year examinations. CBSE Science Value Based Questions for Class 8th Chapter 5 Coal and Petroleum Free PDF. Class 8th books have many questions. These questions are regularly asked in exams in one or other way.
NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum
Answer: (a) Fossil fuels Coal, Petroleum, and natural gas. (b) Process of separation of different constituents from petroleum is called refining. (c) Least polluting fuel for a vehicle is Compressed Natural Gas (CNG). Question 5: Tick True/False against the following statements. (a) Fossil fuels can be made in the laboratory.
NCERT Class 8 Science Chapter 5 Coal and Petroleum
Coal and petroleum were formed from the dead remains or fossils of living organisms. Hence, they are called fossil fuels. 7. What are some uses of coal? Coal is one of the fuels used for cooking food. Earlier, coal was used in railway engines to produce the steam that would run the train.
NCERT Solutions Class 8 Science Chapter 5 Coal and Petroleum
NCERT Solutions for Class 8 Chapter 5 Coal and Petroleum is prepared for the benefit of Class 8 students. They cover the CBSE Syllabus (2023-24) and comprise answers to the questions for Class 8 Science Chapter 5. This solution guides you in your exam preparation and helps you to understand the topic thoroughly.
Exemplar Solutions for Class 8 Science Chapter 5: Coal and Petroleum
Answer 27. Coal when processed in industry gives coke, coal tar and coal gas. Coke is used in the manufacture of steel and in extraction of many metals. Coal tar is used as starting material for manufacturing various sustances such as synthetic dyes, drugs, explosives, perfumes, paints etc. Coal gas is used as fuel.
Coal and Petroleum Class 8 Extra Questions and Answers Science Chapter 5
Coal and Petroleum Class 8 Extra Questions Very Short Answer Type. Question 1. Name some renewable sources of energy. Water, wind, solar. Question 2. Give some examples of fossil fuels. Coal, petroleum, natural gas. Question 3. Name the elements present in coal.
NCERT Solutions for Class 8 Science Chapter 3 Coal and Petroleum
Dipen. 8th June 2023. NCERT Solutions for Class 8 Science Chapter 3 Coal and Petroleum help students to clear all their doubts. These solutions provide you with the answers to all the questions given in the NCERT textbook. CBSE Class 8 Science Chapter 3 Solutions is prepared by expert teachers as per the latest CBSE syllabus and guidelines.
MCQ Questions for Class 8 Science Chapter 5 Coal and Petroleum with
We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 5 Coal and Petroleum with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Coal and Petroleum Class 8 MCQs Questions with Answers here along with a detailed ...

Case Study Questions for Class 8 Science Chapter 5 Coal and Petroleum

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Coal and Petroleum CBSE Class 8 Science Revision Notes Chapter 5

What are fuels?

Why do we need fossil fuels?

What are the characteristics of a good fuel?

How is Coal formed?

Different Types Coal

Uses of Coal

What is destructive distillation?

Major Coal Products

What are hydrocarbons?

What will happen if the coal reserves get depleted?

What substances are released on the burning of coal?

How is Petroleum and Natural Gas formed?

Refining of Petroleum

Constituents of Petroleum and their Uses

Why Petroleum is called ‘black gold?

Natural Gas

Why is Natural Gas important as a fossil fuel?

Why is CNG useful?

Why is CNG considered as a cleaner fuel?

Some Natural Resources are Limited

Consequences of the burning of fossil fuels

Why should we use fossil fuels economically?

How can we save petrol or diesel while driving?

Why fossil fuels can last for 100 years only?

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