Question

1. Which type of coal releases the least amount of heat energy on burning?
A) Lignite B) Peat C) Anthracite D) Bituminous
2. Which of these is an example of a non-renewable source?
A) Trees B) Water C) Coal D) Wind
3. A fuel formed millions of years ago by the decomposition of decayed plants is
A) coal B) petroleum C) natural gas D) wood
4. This is an ore of iron.
A) Limonite B) Anthracite C) Lignite D) Bauxite
5. Which one of the following is not a metal?
A) Lead B) Iron C) Copper D) Coal
6. _________ is also known as black ore.
7. Inferior quality diamonds are used for ________ and _________.
8. _________ is one of the world's leading producers of salt.
9. _________ is the best quality coal
10. _________ is produced by the biological breakdown of biomass.

II. Answer the following in short:
1. Why do you think use of wood as fuel should be minimised?
2. Why are coal and petroleum called fossil fuels?
3. How is hydroelectricity produced?
4. Why is solar energy used by a few tropical countries?
5. Give the uses of tin and gold.
6. Differentiate between:
i. Open cast mining and Shaft mining
ii. Conventional and Non-conventional sources of energy

III. Answer the following questions in brief:
1. Describe how geothermal energy is harnessed and why do only a few countries use it.
2. How does the indiscriminate exploration of mineral resources affect the environment ?
3. Give any two advantages and disadvantages of using each of the following types of
energy: Coal, Nuclear, Hydel, Wind, Geothermal, Solar.
IV. Map Work:
On the outline map of India name any two major centres associated with the following:
i. Iron and Steel
ii. Atomic Power Stations
iii. Coal Mining
iv. Petroleum Mining
v. Geo- thermal Energy
Ch-3 Class-8

Answer 1

Answer:

1.

A) Lignite

3.

C) Natural Gas

Answer 2

Which type of coal releases the least amount of heat energy on burning