Which types of resources of energy are coal, petroleum and natural gas?

1. conventional sources
2. non-renewable sources
3. non-conventional sources
4. Both (1) and (2).

Bituminous coal is also known as …………… .

1. coking coal
2. Peat
3. Steam oven
4. Gas stove

Assertion (A): Natural gas is an eco-friendly fuel.

Reason (R): It is lighter than air and tends to dissipate in case of leakage.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

Anthracite is ideal for domestic use as it is …………….

1. smokeless
2. high calorific value
3. high carbon content
4. All of them.