Question 1

Which of the following is an exhaustible natural resource?

Accepted Answer

Coal is an exhaustible natural resource because the amount of coal in nature is limited and can be exhausted by human activities, unlike sunlight and air.

Question 2

Inexhaustible natural resources are present in:

Accepted Answer

Inexhaustible natural resources are present in unlimited quantity in nature and are not likely to be exhausted by human activities, such as sunlight and air.

Question 3

Coal is formed from the remains of:

Accepted Answer

Coal is formed from the remains of dead vegetation buried deep under the earth millions of years ago, which underwent high temperature and pressure.

Question 4

The slow process of conversion of dead vegetation into coal is called:

Accepted Answer

Carbonisation is the slow chemical process of the conversion of dead vegetation into coal under high pressure and temperature over millions of years.

Question 5

When heated in air, coal burns and produces mainly:

Accepted Answer

When coal is heated in air, it burns and produces mainly carbon dioxide gas along with heat.

Coal and Petroleum — NCERT Class 8 Science Important Questions & Revision Notes