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The MCQs below are drawn from the Physics subject category.
Showing 1841–1850
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1841
The unit of half life is:
A. Metre
B. Kilogram
C. Pound
D. Second
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Correct Option
Explanation
Half-life is a measure of time, so its SI unit is seconds; thus option D is correct.
1842
In Wilson cloud chamber, a-particles leave:
A. Thin and discontinuous tracks
B. Thin and continuous tracks
C. Thick and continuous tracks
D. No tracks
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Correct Option
Explanation
Alpha particles are heavily ionizing and produce thick, continuous condensation tracks in a cloud chamber.
1843
Bohr's atomic model assumes
A. nucleus is of infinite mass and is at rest
B. electron in a quantized orbit will not radiate energy
C. mass of electron remains the same
D. all of the above
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Correct Option
Explanation
Bohr's model includes assumptions that electrons occupy stationary quantized orbits (no radiation) and treats the nucleus as effectively at rest, so 'all of the above' summarizes these assumptions.
1844
What was the fissionable material used in the bomb dropped at Nagasaki (Japan) in the year 1945?
A. Neptunium
B. Berkalium
C. Plutonium
D. Uranium
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Correct Option
Explanation
The Nagasaki bomb (Fat Man) used plutonium as the fissile material.
1845
Which animal did Erwin Schrodinger contemplate using in his famous thought experiment?
A. Rabbit
B. Cat
C. Mouse
D. Dog
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Correct Option
Explanation
Schrödinger's famous thought experiment involves a cat in a box to illustrate quantum superposition and measurement.
1846
Which of the following statements is true about nuclear forces?
A. They are equal in strength to the electromagnetic forces
B. They obey the inverse square law
C. They vary as the inverse third power of the distance
D. They are short range forces
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Correct Option
Explanation
Nuclear forces are short-range forces (acting over roughly femtometre scales), so option C is correct.
1847
When certain radiation passes through matter, it loses energy due to:
A. Excitation of material atoms
B. Any of these
C. Ionization of material atoms due to electrostatic attraction
D. Ionization of material atoms due to direct collision
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Correct Option
Explanation
Radiation can lose energy via excitation or ionization by collision or attraction; the OCR indicates 'Any of these' as the selected option.
1848
119. Examples of the substance/s of small atomic weight is/are:
A. Water
B. Carbon
C. Heavy water
D. All of these
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Correct Option
Explanation
The option 'All of these' groups the listed substances; the question asks for examples, so 'All of these' is the inclusive choice.
1849
Positrons are produced during
A. pair production
B. annihilation
C. ionization
D. X-rays production
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Correct Option
Explanation
Positrons are produced in pair production where a high-energy photon converts into an electron-positron pair.
1850
The process through which photons can interact with matter is:
A. Pair production
B. Any of these
C. Photoelectric effect
D. Compton effect
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Correct Option
Explanation
Photons can interact by the photoelectric effect, Compton scattering, or pair production depending on energy and material, so any of these processes can occur.
