Class 8th Chapter 3 Coal and Petroleum

Class 6 Science Q&A - Fossil Fuels and Petroleum

Class 8 Science Questions and Answers

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

CNG and LPG are clean fuels. They do not pollute the air much. They are easy and safe to use.

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

Bitumen is used for surfacing roads. It is a thick black material obtained from petroleum.

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

Coal forms from dead plants buried under the earth. Heat and pressure turn them into coal. This is called carbonisation.

4. Fill in the blanks:

  • (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 vehicle is CNG.

5. Tick True/False against the following statements:

  • (a) Fossil fuels can be made in the laboratory. – False
  • (b) CNG is more polluting fuel than petrol. – False
  • (c) Coke is almost pure form of carbon. – True
  • (d) Coal tar is a mixture of various substances. – True
  • (e) Kerosene is not a fossil fuel. – False

6. Explain why fossil fuels are exhaustible natural resources.

Fossil fuels take millions of years to form. We are using them quickly. So, they can get finished one day.

7. Describe characteristics and uses of coke.

Coke is black, hard and made of carbon. It is used in steel making and extracting metals from ores.

8. Explain the process of formation of petroleum.

Petroleum is made from dead sea animals buried under the ground. Heat and pressure changed them into oil and gas.

9. The following Table shows the total power shortage in India from 1991–1997. Show the data in the form of a graph.

[Students should draw a graph with X-axis as Year (1991–1997) and Y-axis as Power Shortage % as per the table.]

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