1995 General Studies, all questions
UPSC Prelims 1995 · General Studies
Question 116: Science and Technology
The difference between a nuclear reactor and an atomic bomb is that
ano chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction
bthe chain reaction in nuclear reactor is controlled
cthe chain reaction in nuclear reactor is not controlled
dno chain reaction takes place in atomic bomb while it takes place in nuclear reactor
AnswerThe answer is (b).
Both use the chain reaction of nuclear fission. In an atomic bomb the chain reaction is uncontrolled and releases its energy in an instant, as an explosion. In a reactor the reaction is controlled with a moderator and control rods, which absorb neutrons and so keep the rate steady. Remember: a reactor has a controlled chain reaction, a bomb an uncontrolled one.
Why each option is right or wrong
- (a) A chain reaction does take place in a reactor.
- (b) Right: the chain reaction in a reactor is controlled.
- (c) In a reactor the chain reaction is controlled, not uncontrolled.
- (d) A chain reaction occurs in both, not only in the reactor.
Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 1995, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.