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Q) Which of the following has the least mass?
Correct Answer - Option
(C)
Explanation:
Electron has the least mass among the given particles, approximately 1/1836 of a proton.
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Q) Which nuclear reaction is responsible for the energy of the sun?
Correct Answer - Option
(B)
Explanation:
The Sun’s energy comes from the fusion of hydrogen nuclei into helium, releasing enormous energy.
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Q) Which of the following isotopes is used in nuclear power plants for generating electricity?
Correct Answer - Option
(A)
Explanation:
Uranium-235 undergoes controlled fission in nuclear power plants to produce electricity.
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Q) What is radioactivity?
Correct Answer - Option
(B)
Explanation:
Radioactivity is the spontaneous disintegration of unstable atomic nuclei with emission of radiation.
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Q) Which scientist discovered radioactivity?
Correct Answer - Option
(B)
Explanation:
Henri Becquerel discovered natural radioactivity in 1896 while studying uranium salts.
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Q) What type of radiation is deflected the most by a magnetic field?
Correct Answer - Option
(B)
Explanation:
Beta particles have small mass and high velocity, so they are deflected most in a magnetic field.
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Q) Which radioactive element is used in smoke detectors?
Correct Answer - Option
(C)
Explanation:
Americium-241 emits alpha particles that ionize air, helping detect smoke in alarm systems.
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Q) Which type of nuclear radiation has the least penetrating power?
Correct Answer - Option
(A)
Explanation:
Alpha particles can be stopped by a sheet of paper or even human skin.
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Q) The energy released per fission of a uranium nucleus is approximately:
Correct Answer - Option
(C)
Explanation:
Each uranium-235 fission releases about 200 MeV of energy in the form of kinetic energy and radiation.
T
Q) What is the main coolant used in pressurized water reactors (PWR)?
Correct Answer - Option
(C)
Explanation:
Pressurized water reactors use light water as both coolant and moderator.
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