1. The major problem in harnessing nuclear energy is how to (a) split nuclei? (b) sustain the reaction? (c) dispose off spent fuel safely? (d) convert nuclear energy into electrical energy?

Soln:

Answer is (c) dispose off spent fuel safely?

Explanation:

Nuclear plants produces highly radioactive material. This if released to the environment they pose major threat to living organisms. Hence, disposing the spent fuel safely is a major problem in harnessing nuclear energy.