Q. Consider the following statements:
1.Nuclear fusion involves fusion of nuclei of two lighter elements to form the nucleus of a heavier atom.
2.Fusion reactions happen only at very high temperatures.
3.Nuclear fusion generates very less energy compared to nuclear fission.
Which of the statements given above are correct?

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: A
Notes:

Explanation –

Statement 1 and 2 are correct. Nuclear fusion involves fusion of nuclei of two lighter elements together to form the nucleus of a heavier atom. Fusion reactions happen only at very high temperatures, 10 times the temperature that exists at the core of the Sun.

Statement 3 is incorrect. Nuclear fusion is considered as holy grail of energy production. It is called such because the fusion of pairs of light atoms produces immense energy with very small amounts of radioactive waste, unlike nuclear fission.

Source: ForumIAS