Q. Which of the following is a characteristic of radioactive decay? (2019)
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A.
It is a random process
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B.
It occurs at a constant rate
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C.
It can be accelerated by external factors
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D.
It produces energy only
Solution
Radioactive decay is a random process, meaning that it cannot be predicted when a particular nucleus will decay.
Correct Answer: A — It is a random process
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Q. Which of the following isotopes is commonly used in nuclear reactors? (2021)
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A.
Uranium-238
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B.
Carbon-12
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C.
Hydrogen-1
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D.
Oxygen-16
Solution
Uranium-238 is commonly used as fuel in nuclear reactors due to its ability to undergo fission.
Correct Answer: A — Uranium-238
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Q. Which of the following processes involves the emission of a positron? (2019)
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A.
Alpha decay
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B.
Beta decay
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C.
Gamma decay
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D.
Neutron capture
Solution
Beta decay involves the emission of a positron, which is the antimatter counterpart of an electron.
Correct Answer: B — Beta decay
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Q. Which type of radiation has the highest penetrating power? (2019)
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A.
Alpha particles
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B.
Beta particles
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C.
Gamma rays
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D.
Neutrons
Solution
Gamma rays have the highest penetrating power among the types of radiation, able to pass through most materials.
Correct Answer: C — Gamma rays
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