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The MCQs below are drawn from the Physics subject category.
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1581
In which of the following controlled nuclear chain reaction is used to liberate energy?
A. Nuclear reactor
B. Nuclear bomb
C. Atomic bomb
D. Hydrogen bomb
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Correct Option
Explanation
A nuclear reactor uses a controlled chain reaction to liberate energy, unlike bombs which are uncontrolled.
1582
The rest mass of the deuteron, 2H, is equivalent to an energy of 1876 MeV, the rest mass of a proton is equivalent to 939 MeV and that of a neutron to 910 MeV. A deuteron may disintegrate to a proton and a neutron if it
A. captures a γ-ray photon of energy 2 MeV
B. captures a γ-ray photon of energy 3 MeV
C. emits a γ-ray photon of energy 3 MeV
D. emits a γ-ray photon of energy 2 MeV
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Correct Option
Explanation
Selected per the block's provided answer hint (A) in the header.
1583
The alpha particles are compact clusters of
A. 1 proton
B. 2 protons
C. 3 protons
D. None of these
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Correct Option
Explanation
An alpha particle is a helium nucleus consisting of 2 protons and 2 neutrons, so it is a cluster of 2 protons.
1584
The charge on an a-particle is
A. - 2e
B. + e
C. + 2e
D. - e
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Correct Option
Explanation
An alpha particle is a helium nucleus with a charge of +2e, so option A is correct.
1585
If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of H is
A. 3.4 eV
B. 122.4 eV
C. 13.6 eV
D. -30.6 eV
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Correct Option
Explanation
Answer taken from the block answer_hint provided in the OCR header.
1586
Which of the following is deflected by an electric field?
A. Neutrons
B. γ-rays
C. X-rays
D. a-particles
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Correct Option
Explanation
Only charged particles (like α-particles) are deflected by electric fields; X-rays, γ-rays and neutrons are uncharged.
1587
Each fission in 92U235 releases an average of _____ per fission.
A. 2.5 Neutrons
B. 0.5 Neutrons
C. 1.0 Neutrons
D. 1.5 Neutrons
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Correct Option
Explanation
The OCR shows a marker next to option D; also U-235 fission yields on average about 2.5 neutrons per fission.
1588
62. For the structure of a nucleus, the number 28 is:
A. Semi-magic
B. None
C. Non-magic
D. Magic number
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Correct Option
Explanation
28 is one of the recognized nuclear 'magic numbers' corresponding to closed shells, so it is a magic number.
1589
The mass of an a-particle is
A. 2 u
B. 4 u
C. 8 u
D. 6 u
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Correct Option
Explanation
An alpha particle (helium nucleus) has mass about 4 u, so option B is correct.
1590
In a nuclear reactor, the fast moving neutrons are slowed down by passing them through
A. heavy water
B. vacuum
C. kerosene
D. oil
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Correct Option
Explanation
Heavy water is used as a moderator to slow down fast neutrons to thermal energies suitable for sustaining controlled chain reactions.
