Page 70 - Science Class 08

5. What do you mean by fossil fuels?
6. How is petroleum formed?

7. Write important types of coal.
8. Write the uses of coal tar.
9. How is producer gas obtained?

10. Write the main advantages of natural gas.
F. Short answer ques ons.
1. Write the characteris cs of a good fuel.
2. Differen ate between exhaus ble and inexhaus ble sources of energy.

3. Give examples of solid, liquid and gaseous fuels.
4. Differen ate between primary fuels and secondary fuels.
5. Which are products obtained from petroleum?

6. Write the uses of coal.
7. How are different components of coal obtained?
8. How is water gas obtained?
9. Write the role of energy in modern development in brief.

10. What are the causes behind energy crisis?
G. Long answer ques ons.
1. Describe in brief the forma on of coal in the earth.
2. Where is natural gas found? Why is it called a clean fuel? Give two reasons.

3. State two important uses of CNG.
4. How can we prevent energy crisis?

Project ActivityActivityActivity
Project
Project
Project Activity
A. Visit a candle making factory of your area to learn various processes which are involved in
large scale produc on of candles.

B. Find out why CNG is preferred as a fuel over diesel. Prepare report on the advantages and
disadvantages of CNG as an automobile fuel.

HOTSTSTS
HO
HO
HOTS
A. All renewable resources are inexhaus ble. Do you agree? Give reasons.
B. In a petroleum well, crude oil is found above water. Which two proper es of petroleum make
it possible to form a layer of it above water?
C. Can fossil fuels be made in laboratory?

70 Science-8