Fission and Fusion NEET Questions

Physics - Atoms and Nuclei

Fission and Fusion MCQ Questions


13.
A chain reaction in nuclear fission is sustained because:
A.
Heavy nuclei are unstable
B.
Energy is released
C.
Each fission releases more neutrons that trigger further fissions
D.
Fission products are radioactive
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ANSWER :
C. Each fission releases more neutrons that trigger further fissions
14.
The reproduction factor (multiplication factor) k of a chain reaction is:
A.
Number of neutrons per fission
B.
Number of new fission events caused by neutrons from each fission
C.
Energy released per fission
D.
Number of protons per nucleus
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ANSWER :
B. Number of new fission events caused by neutrons from each fission
15.
A chain reaction is critical when:
A.
k < 1
B.
k = 0
C.
k = 1 (each fission causes exactly one new fission)
D.
k > 1
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ANSWER :
C. k = 1 (each fission causes exactly one new fission)
16.
If k > 1, the chain reaction is:
A.
Subcritical (dies out)
B.
Stable
C.
Supercritical (uncontrolled, used in nuclear bombs)
D.
Critical (steady)
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ANSWER :
C. Supercritical (uncontrolled, used in nuclear bombs)
17.
If k < 1, the chain reaction:
A.
Becomes a fusion reaction
B.
Remains steady
C.
Dies out (subcritical)
D.
Grows exponentially
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ANSWER :
C. Dies out (subcritical)
18.
The minimum amount of fissile material required to sustain a chain reaction is called:
A.
Reduced mass
B.
Atomic mass
C.
Critical mass
D.
Maximum mass
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ANSWER :
C. Critical mass