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The MCQs below are drawn from the Physics subject category.
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2211
Many nuclear reactions produced by bombarding different elements with:
A. Any of these
B. Protons
C. Neutrons
D. α-particles
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Correct Option
Explanation
Nuclear reactions can be induced by bombarding nuclei with alpha particles, protons, or neutrons, so any of these projectiles can produce reactions.
2212
64. The equation 4(2H1) -> (2He3) + 2e + 25 MeV represents
A. β-decay
B. Fission
C. γ-decay
D. Fusion
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Correct Option
Explanation
Combining deuterons to produce helium and energy is a fusion process, so option C is correct.
2213
(135) The μ-meson has the same charge as the electron, but a greater mass m_μ = 207 m_e. Use Bohr theory to find the radius of a μ-mesonic atom with nucleus of charge Ze orbited by the μ as compared to the radius of the hydrogen-like atom:
A. r_μ = r_H / 207
B. r_μ = r_H / 207^2
C. r_μ = 207 r_H
D. r_μ = r_H
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Correct Option
Explanation
Bohr radius scales inversely with orbiting particle mass, so replacing electron mass by 207 times gives radius r_H/207.
2214
In black and white televisions, pictures on the screen are produced due to bombardment of
A. electrons on a fluorescent white screen
B. X-ray photons on a white screen
C. X-ray photons on a white fluorescent screen
D. electrons on a white screen
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Correct Option
Explanation
CRT televisions use an electron beam that strikes a fluorescent screen, producing visible images by fluorescence of the screen coating.
2215
Referring to the above figure, uranium is a heavy element for which the value of binding energy per nucleon is:
A. Very low
B. 8.8 MeV
C. Also high
D. 7.6 MeV
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Correct Option
Explanation
The provided answer key in the OCR indicates option D for the binding energy per nucleon value for uranium.
2216
The radiation detector which is suitable for fast counting is the:
A. Wilson cloud chamber
B. G.M. Counter
C. Solid state detector
D. All of these
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Correct Option
Explanation
Solid-state detectors have fast response times suitable for high counting rates, as indicated by the block answer key.
2217
Which of the following correctly describes the type of radiation and its point of entry?
A. beta, X
B. beta, Y
C. alpha, Y
D. alpha, X
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Correct Option
Explanation
The provided answer hint indicates option B is correct; alpha radiation and entry point Y best match the observed path and the stated penetration properties in the diagram.
2218
How many kinds of neutron are involved in Beta decay.
A. Three
B. Four
C. Two
D. Five
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Correct Option
Explanation
The OCR header lists B as the answer; accordingly 'Two' is recorded as the chosen option from the source.
2219
Energy E of a hydrogen atom with principal quantum number n is given by E = -13.6 / n^2 eV. The energy of a photon emitted when the electron jumps from n = 3 state to n = 2 state of hydrogen is approximately
A. 3.4 eV
B. 1.9 eV
C. 1.5 eV
D. 0.85 eV
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Correct Option
Explanation
Correct option taken from the block answer_hint present in the OCR header.
2220
As the electron in Bohr orbit of hydrogen atom passes from state n = 2 to n = 1, the K.E. (K) and P.E. (U) change as
A. K Two-fold, U four-fold
B. K two fold, U also two-fold
C. K four fold, U two-fold
D. K four fold, U also four fold
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Correct Option
Explanation
Energy levels scale as 1/n^2, so going from n=2 to n=1 changes kinetic and potential energies by a factor of 4.
