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.

…………… is the oldest coalfield in India.

1. Raniganj
2. Jharia
3. Korba
4. Singrauli

Gondwana coal has variable quantities of …………… .

1. Low moisture
2. Small sulphur
3. Small variable quantity of phosphorus
4. All of them