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101.

What is the source of energy in nuclear fission and fusion ?

Answer» The disappearance of certain mass `(Delta m)` in both the processes, fission and fusion. It appears as energy.
102.

(a) What is the major hurdle in the generation of electrical energy from nuclear fusion ? (b) What is the amount of energy released when `1` atom of `_92^235 U` undergoes fission ?

Answer» (a) Controlling the thermonulear (fusion) as it occurs at very high temperature `(10^7 K)`.
(b) `200 MeV`.
103.

The heat energy released during nuclear fission and fusion is due to the :A. conversion of stored chemicals into energyB. conversion of momentum into energyC. conversion of mass into energyD. conversion of magnetism into energy

Answer» Correct Answer - C
104.

Choose the correct statement:A. Sun can be taken as an inexhaustible source of energyB. There is infinite storage of fossil fuel inside the earthC. Hydro and wind energy plants are non-polluting sources of energyD. Waste from a nuclear power plant can be easily disposed off

Answer» Correct Answer - A
The sun has been radiating an enormous amount of energy at the present rate for nearly 5 billion years and will continue radiation at that rate for about 5 billion years more, so, the sun can be taken as an inexhaustible source of energy.