Question 1

Which of the following is a renewable source of energy?

Accepted Answer

Solar energy is considered a renewable source of energy because it is inexhaustible and continuously replenished by the Sun, unlike fossil fuels which are limited.

Question 2

What is the main component of biogas?

Accepted Answer

Methane is the main component of biogas, constituting about 75% of it, which makes it an excellent fuel.

Question 3

Which device converts solar energy into electrical energy?

Accepted Answer

Solar cells (or photovoltaic cells) are devices that convert solar energy directly into electrical energy.

Question 4

Acid rain is primarily caused by the emissions of:

Accepted Answer

Burning of fossil fuels releases oxides of sulphur and nitrogen, which dissolve in rainwater to form acids, causing acid rain.

Question 5

The process by which energy is produced in the Sun is:

Accepted Answer

Nuclear fusion is the process in which lighter atomic nuclei combine to form a heavier nucleus, releasing a tremendous amount of energy in the Sun.

Sources of Energy — CBSE Class 10 Science Important Questions & Revision Notes