Verified past-paper data not yet uploaded
No verified paper has been uploaded for AJKPSC-PMS Paper Physics 2022 MCQs yet.
The MCQs below are drawn from the Physics subject category.
Showing 2311–2320
of 15583 MCQs
Page 232 / 1559
2311
The nuclear reactor gives energy in the form of
A. Heat
B. Light
C. Electricity
D. Chemical energy
Discuss
Save
Correct Option
Explanation
A nuclear reactor primarily produces heat through fission, which can then be used to generate electricity.
2312
The expected grand unified force, called electronuclear force, is the union of:
A. Magnetic and weak nuclear forces
B. Electro-weak and strong nuclear forces
C. Electromagnetic and strong nuclear forces
D. Electric and weak nuclear forces
Discuss
Save
Correct Option
Explanation
A grand unified force would combine the electroweak interaction with the strong nuclear force, often termed electro-weak plus strong.
2313
The ionization energy of an atom relative to binding energy of its nucleus is:
A. Smaller
B. Greater
C. The same
D. Sometimes greater & sometimes smaller
Discuss
Save
Correct Option
Explanation
Atomic ionization energies are much smaller than nuclear binding energies, so 'Smaller' is correct.
2314
Which of the following is a true statement about the nuclear binding energy in the semi-empirical mass formula model?
A. The volume term is proportional to A^2.
B. The Coulomb term is proportional to A^-2/3.
C. The surface term is proportional to A^{1/3}.
D. The symmetry term is proportional to (A - 2Z)^2 / A.
Discuss
Save
Correct Option
Explanation
The semi-empirical mass formula includes a symmetry term proportional to (A-2Z)^2/A, so option A is the correct true statement.
2315
The existence of a positively charged nucleus in an atom was first suggested by the experiment of
A. C.T.R. Wilson
B. J.J. Thomson
C. E. Rutherford
D. R.A. Millikan
Discuss
Save
Correct Option
Explanation
Rutherford's gold foil experiment indicated a small positively charged nucleus at the atom's centre.
2316
X-rays are produced due to
A. change in nuclear energy level
B. radioactive disintegration
C. break up of molecules
D. change in atomic energy level
Discuss
Save
Correct Option
Explanation
Characteristic X-rays are emitted when electrons transition between atomic energy levels, so they arise from changes in atomic energy levels.
2317
What is the use of graphite and heavy water in a nuclear reactor?
A. To decrease the energy of neutron
B. To absorb neutron
C. To increase the energy of neutron
D. To decrease the number of neutron
Discuss
Save
Correct Option
Explanation
Graphite and heavy water act as moderators, slowing (decreasing the energy of) neutrons to sustain chain reactions.
2318
Two nuclei are said to be mirror nuclei if
A. the number of protons in the two nuclei are equal
B. the number of nucleons in the two are equal
C. the number of neutrons in one equals the number of protons in the other and vice versa
D. the number of neutrons in the two are equal
Discuss
Save
Correct Option
Explanation
Mirror nuclei have proton number in one nucleus equal to neutron number in the other and vice versa, so option C is correct.
2319
What is the charge on alpha particles emitted during the phenomenon of radioactivity?
A. -2e
B. -e
C. +e
D. +2e
Discuss
Save
Correct Option
Explanation
An alpha particle is a helium nucleus with two protons and two neutrons, carrying a net charge of +2e.
2320
(136) Calculate the Q value in MeV for the nuclear reaction 27 Al(d, p) 28 Al given that m(27 Al) = 26.98154, m_d = 2.01473, m_p = 1.00794, and m(28 Al) = 27.98154, all in a.m.u:
A. -6.83 MeV
B. 6.83 MeV
C. 6.32 MeV
D. 0.0 MeV
Discuss
Save
Correct Option
Explanation
Using masses, Δm ≈ 0.00679 u → Q ≈ 0.00679×931.5 ≈ 6.32 MeV, matching option (c).
