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CBSE Class 8 Science Important Questions Chapter 3 - Coal and Petroleum

CBSE

Class 8 Important Question

Science

Chapter 5: Coal And Petroleum

Study Important Questions for Class 8 Science Chapter 3 – Coal and Petroleum - FREE PDF Download

Important Questions of Class 8 Science Chapter 3 focuses on "Coal and Petroleum," two important resources that are essential for our daily lives and the economy. This chapter discusses how coal and petroleum are formed, their uses, and their significance, along with their impact on the environment. Understanding these concepts is important for students as they learn about energy sources and how they are used in different industries.

To help with your studies, you can find Important Questions for Class 8 Science that reinforce your knowledge and prepare you for exams. This chapter explains the processes of coal and petroleum formation and their various applications in our lives. These questions follow the CBSE Class 8 Science syllabus and cover key topics from the chapter, making your revision more effective. Practising these questions will help you understand the material better and do well in your assessments.

Access Important Questions for Class 8 Science Chapter 3 - Coal and Petroleum

Very Short Answer Questions: (1 Mark)

1. When coal burns in air _________ is formed.

A. Carbon Dioxide B. Sulphur Dioxide

C. Carbon Monoxide D. Hydrogen Gas

Ans: A. Carbon Dioxide.

2. Which one of the following is obtained from coal tar?

A. Petrol B. Coke

C. Air D. Naphthalene Balls

Ans: D. Naphthalene Balls

3. Which one of the following is NOT a fossil fuel?

A. Petrol B. Coal

C. Wood D. Diesel

Ans: C. Wood

4. Which one of the following is NOT a non-renewable energy resource?

A. Coal B. Petroleum

C. Solar energy D. Electricity

Ans: C. Solar Energy

5. ___________ is a natural resource.

A. Car B. Bus

C. Water D. Parks

Ans: C. Water

6. Which one is least polluting Fuel?

A. Petrol B. Diesel

C. CNG D. Kerosene

Ans: C. CNG

7. Coal tar contains about ____________.

A. 300 Substance B. 400 Substance

C. 200 Substance D. 100 Substance

Ans: C. 200 Substances

8. Give examples of any two exhaustible resources.

Ans: Coal, petroleum, etc.

9. Give examples of any two inexhaustible resources.

Ans: Sunlight, air, etc

10. Give any two uses of coal.

Ans: Cooking, running rail engines, etc.

11. Name the products of coal.

Ans: Coke, coal tar, coal gas

12. Give any two uses of petroleum.

Ans: Uses of petroleum:

i. It is used to run vehicles.

ii. It is used in petroleum products like Vaseline.

13. Name any two natural gas reserves in India.

Ans: Tripura, Rajasthan, Maharashtra

Short Answer Questions: (3 Marks)

14. What are natural resources? Differentiate between exhaustible and inexhaustible natural resources.

Ans: Resources which we find in our natural environment are called natural resources. Natural resources can be classified into two categories:

Exhaustible Resources	Inexhaustible Resources
These resources are present in limited amounts in nature.	These resources are present in unlimited amounts in nature.
It cannot be replenished after getting exhausted.	It gets replenished after use.
Example: Coal, Petroleum etc.	Example: Water, Sunlight etc.

15. Define fossil fuels

Ans: Fossil fuels are formed by the constant decomposition of dead and decaying animals and plants under pressure and heat in the earth’s crust. Fossil fuel takes thousands of years to form. Example: Coal, Petroleum etc.

16. What is petroleum? How is it formed?

Ans: Petroleum is a type of exhaustible natural resource. Diesel and petrol are obtained from petroleum. Petroleum is found deep inside water in the sea or oceans.

Petroleum is formed from dead organisms which are found in water. The bodies of dead organisms settle at the bottom of the ocean and get covered with soil/sand or other aquatic plants and start decaying slowly. Over millions of years, these dead organisms turn into petroleum or natural gas due to the non-availability of proper oxygen, heat and constant high pressure.

17. What is refining? Why does petroleum require refining?

Ans: The process of separating the various constituents of petroleum at different boiling points is known as refining. Natural petroleum is a crude dark coloured liquid with a very unpleasant smell. It cannot be used in its crude form. Hence, we find petroleum in several different products such as diesel, petrol, wax and use it for various purposes.

18. Name the different constituents of petroleum and write their uses.

Ans:

Constituents	Uses
LPG	Fuel for home and industries.
Petrol	Motor fuel, Aviation fuel, Solvent for dry cleaning.
Diesel	Fuel for vehicles and generators.
Paraffin Wax	Ointment, Candle, Wax etc.
Lubricating Oil	Lubrication in machines
Bitumen	Paints
Kerosene	Fuel for stove, lamps, jet etc.

19. Why is natural gas a very important fossil fuel?

Ans: Natural gas is important fossil fuel because it mainly constitutes methane and doesn’t produce much pollution. It is a clean gas. Natural gas compressed under high pressure forms CNG which we use in our cars as fuel.

20. State the uses of natural gas.

Ans: Natural gas is used for:

a. Power generation.

b. Fuel for transport vehicles.

c. As a fuel in homes for cooking.

d. Manufacturing of fertilizers and chemicals.

21. Why is natural gas preferred over petrol as a transport fuel?

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.

(a) Coke: Coke is almost a pure form of carbon. It is dark in colour. It is used for the extraction of metals.

(b) Coal Tar: It is a black liquid with a very unpleasant smell. It is a by-product obtained during the formation of coke. Coal tar is a major constituent during the manufacturing of paints or anti-dandruff shampoos.

23. Why should we use some resources like coal and petroleum in limit?

Ans: Resources like coal and petroleum are from exhausting natural resources. They are formed by the decomposition of dead organisms over millions of years. Their replenishment rate is very slow. Also, this fossil fuel produces carbon dioxide on burning which is very harmful to our environment causing air pollution as well as global warming. Hence, we should use coal and petroleum in limited amounts.

24. Suggest ways in which consumption of fuels can be reduced.

Ans: The Petroleum Conservation Research Association (PCRA) advises people on how to save petrol/diesel while driving. This will also help in the reduction of air pollution.

Some of the ways are as follows:

Use more renewable sources of energy such as CNG.
Switch off the engine of the vehicle at traffic lights or in long jams.
Ensure regular maintenance of the vehicle.
We can use bicycles for a small distance.

5 Important Topics of Class 8 Science Chapter 3 You Shouldn’t Miss!

S.No.	Important Topics For Class 8 Coal and Petroleum
1.	Formation of Coal
2.	Formation of Petroleum
3.	Uses of Coal
4.	Uses of Petroleum
5.	Environmental Impact of Coal and Petroleum

Benefits of Class 8 Chapter 3 Science Important Questions

Clarification of Key Concepts: Important questions help students understand the main ideas about how coal and petroleum are formed and used.
Enhanced Critical Thinking: Engaging with these questions encourages students to think about how coal and petroleum impact daily life and the environment.
Improved Retention of Information: Answering important questions helps students remember key facts about coal and petroleum more easily.
Better Exam Preparation: Practising these questions gives students a clear idea of what to expect on exams, making them feel more ready.
Real-World Application: The questions connect what students learn in class to real-life issues, showing the importance of coal and petroleum.
Development of Research Skills: Important questions encourage students to look deeper into topics, helping them become more curious and knowledgeable.
Increased Confidence: Regular practice helps students feel more confident in their understanding, preparing them for tests and discussions.

Conclusion

The Important Questions for CBSE Class 8 Science Chapter 3, "Coal and Petroleum," are very helpful for students. They provide a clear way to learn about key topics such as the formation, extraction, and uses of coal and petroleum. These questions encourage active learning and help in understanding and retention of the material. They also serve as useful tools for exam preparation, helping students assess their knowledge. Overall, these questions make the complex topics easier to understand and can improve academic performance.

Important Study Materials for Class 8 Science Chapter 3

S.No	Study Materials Links for Chapter 3 Coal and Petroleum
1.	Class 8 Coal and Petroleum NCERT Solutions
2.	Class 8 Coal and Petroleum Revision Notes

CBSE Class 8 Science Important Questions for All Chapters

S.No	Chapter-wise Important Questions for Class 8 Science
1.	Chapter 1: Crop Production and Management Questions
2.	Chapter 2: Microorganisms: Friend And Foe Questions
3.	Chapter 4: Combustion And Flame Questions
4.	Chapter 5: Conservation Of Plants And Animals Questions
5.	Chapter 6: Reproduction In Animals Questions
6.	Chapter 7: Reaching The Age Of Adolescence Questions
7.	Chapter 8: Force And Pressure Questions
8.	Chapter 9: Friction Questions
9.	Chapter 10: Sound Questions
10.	Chapter 11: Chemical Effects Of Electric Current Questions
11.	Chapter 12: Some Natural Phenomena Questions
12.	Chapter 13: Light Questions

Additional Study Materials for Class 8 Science

S.No	Study Materials for Class 8 Science
1.	CBSE Class 8 Science NCERT Solutions
2.	CBSE Class 8 Science Revision Notes
3.	CBSE Class 8 Science NCERT Book
4.	CBSE Class 8 Science Sample Papers
5.	CBSE Class 8 Science NCERT Exemplar Solutions
6.	CBSE Class 8 Science Worksheets

FAQs on CBSE Class 8 Science Important Questions Chapter 3 - Coal and Petroleum

1. What are the key characteristics of coal discussed in Class 8 Chapter 3 at Vedantu?

In Class 8 Chapter 3, coal is described as a solid, usually, black or brownish-black, made mainly of carbon. Its features include different carbon levels, hardness, and energy content, making it a valuable energy source.

2. How do the Vedantu’s Important Questions for Class 8 Chapter 3 help students learn about petroleum?

The important questions for Class 8 Chapter 3 give students a clear way to understand how petroleum is formed, extracted, and used, helping them learn and prepare for exams.

3. What processes are involved in refining petroleum, according to Chapter 3 Class 8?

According to Class 8, refining petroleum involves separating crude oil into different products through a method called distillation. This process creates fuels like gasoline, diesel, and other useful chemicals.

4. Why is coal considered a non-renewable resource in Chapter 3 Vedantu?

Coal is considered a non-renewable resource because it takes millions of years to form from ancient plant material. Once it is used up, it cannot be replaced quickly.

5. What is the role of Vedantu in helping Vedantu’s Class 8 students understand Chapter 3?

Vedantu provides important questions and NCERT solutions for Class 8 Chapter 3, "Coal and Petroleum," helping students understand key ideas and prepare well for their exams.

6. What are some advantages of using coal as an energy source mentioned in Class 8?

The advantages of using coal include its availability, low cost, and high energy output. It is also an important resource for generating electricity and making industrial materials.

7. How does the extraction of petroleum affect the environment, as discussed in Class 8?

The extraction of petroleum can lead to problems like oil spills, habitat destruction, and pollution. These impacts can harm ecosystems and wildlife.

8. What are the key differences between coal and petroleum mentioned in Class 8 Chapter 3?

Key differences include how they are formed, their physical states (coal is solid and petroleum is liquid), and their uses. Coal is mainly used for electricity, while petroleum is used for fuels and chemicals.

9. How does the chapter explain the importance of conserving coal and petroleum resources?

The chapter highlights the need to conserve coal and petroleum because they are non-renewable and can harm the environment. Using these resources wisely can help them last longer.

10. What are fossil fuels, and why are they important according to Class 8?

Fossil fuels are natural resources like coal and petroleum formed from ancient living things. They are important because they provide energy for electricity, transportation, and many industries.

11. How can practising important questions help Class 8 students prepare for their exams on Chapter 3?

Practising important questions helps Class 8 students find key ideas, improve their understanding, and check what they know about coal and petroleum before the exams.

12. What products are made from petroleum as mentioned in Class 8?

Class 8 mentions that products made from petroleum include gasoline, diesel, kerosene, and chemicals used in plastics and other materials.

13. How does using coal and petroleum impact climate change, according to Chapter 3?

Using coal and petroleum releases greenhouse gases into the air, which contributes to climate change. This is an important issue discussed in Chapter 3.

14. What are the main uses of coal in industries mentioned in Class 8?

In Class 8, it is mentioned that coal is used in industries to generate electricity, produce steel, and as a fuel in various manufacturing processes.