The sun which gives us heat and light, derives its energy from the fusion of hydrogen nuclei into helium nuclei, which is going on inside it, all the time. The main nuclear fusion reaction taking place in the sun which releases a tremendous amount of energy is the fusion of 4 hydrogen atom nuclei to form a bigger nucleus of helium atom. The total energy produced by the fusion of hydrogen into helium is tremendous. All this energy is released in the form of heat and light. It is this energy which makes the sun shine and give us heat and light.
1. The sun derives its energy from the fusion of ........... into ........... which is going on inside it all the time.
a. Hydrogen,helium
b. Carbon,oxygen
c. Helium,hydrogen
d. Oxygen,carbon
2. In the sun, fusion of ......... hydrogen atom nuclei forms a bigger nucleus of helium atom.
a. 3
b. 4
c. 5
d. 6
3. ............ reactions of ......... are the source of the sun's energy.
a. Nuclear fusion , helium
b. Nuclear fission, hydrogen
c. Nuclear fusion, hydrogen
d. None of these
4. Stars obtain their energy from the nuclear fission reactions of helium.
a. TRUE
b. FALSE
5. The energy produced in nuclear fusion reaction is much more than that produced in a nuclear fission reaction.
a. TRUE
b. FALSE
