Name Two Energy Sources That You Would, Give the Names of Two Ene in Text Question Chapter 14 Sources of Energy

Q No. 1: Name two energy sources that you would consider to be renewable. Give reasons for your choices.
Ans: Two renewable sources of energy are as follows:
(a) Sun: The energy derived from the Sun is known as solar energy. Solar energy is produced by the fusion of hydrogen into helium, fusion of helium into other heavy elements, and so on. A large amount of hydrogen and helium is present in the Sun. The Sun has billions years more to burn. Therefore solar energy is a renewable source of energy.
(b) Wind: Wind energy is derived from fast blowing air. Wind energy is harnessed by windmills in order to generate electricity. Air blows because of uneven heating of the Earth. Since the heating of the Earth will continue forever therefore wind energy will also be available forever.

Q No. 2: Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices.
Ans: Two exhaustible energy sources are as follows:
(a) Coal: It is produced from dead remains of plants and animals that buried under the earth’s crust for millions of years ago. It takes millions of years to produce coal. It means coal cannot replenish within a short period of time. So it is a non-renewable or exhaustible source of energy.
(b) Wood: It is obtained from forests. Forests are decreasing at very fast rate due to deforestation. If deforestation is continued at this rate, then there would be no wood left on the Earth. Hence, wood is an exhaustible source of energy.