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 13 of 17)

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85 Proton was discovered by Rutherford by bombarding nitrogen with:
Correct Answer: A
Explanation: Rutherford observed protons by alpha-particle collisions with nitrogen.
86 An apparatus used to determine the masses of protons, nuclei, ions is:
Correct Answer: C
Explanation: Mass spectrometers measure mass-to-charge ratios of ions.
87 Which one of the following cannot be used as moderator:
Correct Answer: C
Explanation: Lead absorbs neutrons; moderators (e.g., graphite, heavy water) slow neutrons.
88 Which one of the following can be used as neutron arrestor?
Correct Answer: D
Explanation: Cadmium rods absorb neutrons to control reactor fission rates.
89 Which one of the following isotopes of uranium can undergo fission with bombardment of slow neutron:
Correct Answer: A
Explanation: $^{235}\text{U}$ undergoes thermal-neutron-induced fission.
90 Half life of a given sample of radium is 22 years. The sample will reduce to 25% of its original value after:
Correct Answer: C
Explanation: 25% remaining = 2 half-lives = 44 years.
91 According to Rutherford the size of the nucleus is of order of:
Correct Answer: B
Explanation: Nuclear radius ≈ $10^{-14}\text{m}$ (femtometer scale).
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