Atomic Nucleus|. Practice MCQs Physics for Mdcat By Engr. Kamran Soomro | mosaicbro.com

Atomic Nucleus|. Practice MCQs Physics for Mdcat By Engr. Kamran Soomro

7 of 114 questions (Page 7 of 17)

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43 Alpha particles are:
Correct Answer: D
Explanation: Alpha particles are helium nuclei ($^4_2\text{He}$), with 2 protons and 2 neutrons.
44 The rate of decay (disintegration per unit time) of radioactive substance:
Correct Answer: B
Explanation: Radioactive decay follows an exponential law: $N(t) = N_0 e^{-\lambda t}$.
45 The binding energy per nucleon is:
Correct Answer: B
Explanation: Heavy nuclei (e.g., uranium) have lower binding energy per nucleon than mid-weight nuclei (e.g., iron).
46 A Curie represents a very strong source of:
Correct Answer: C
Explanation: The curie unit measures the intensity of radioactivity, not a specific particle type.
47 During fission process, a large amount of:
Correct Answer: B
Explanation: Nuclear fission converts mass into energy via $E=mc^2$, releasing vast nuclear energy.
48 Controlled fission chain reaction is maintained in a:
Correct Answer: A
Explanation: Nuclear reactors control fission rates using moderators and control rods.
49 Fission chain reaction is controlled by introducing:
Correct Answer: B
Explanation: Cadmium rods absorb neutrons to regulate the chain reaction.
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