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 14 of 17)

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92 In discovery of nucleus Rutherford bombarded a thin gold foil with fast moving:
Correct Answer: C
Explanation: Rutherford used alpha particles in his gold foil experiment (1909).
93 After alpha decay the atomic number of the atom:
Correct Answer: B
Explanation: Alpha decay reduces atomic number by 2 (loss of 2 protons).
94 The half-life of radium is 1600 years. What is the fraction of radium sample that would survive after 6400 years?
Correct Answer: D
Explanation: 6400 years = 4 half-lives; remaining fraction = $(\frac{1}{2})^4 = \frac{1}{16}$.
95 Electron was discovered by J.J. Thomson by passing an electric discharge through:
Correct Answer: A
Explanation: Thomson used low-pressure gas discharge tubes to study cathode rays (electrons).
96 Neutron was discovered by:
Correct Answer: A
Explanation: James Chadwick discovered neutrons in 1932.
97 Electron was discovered in:
Correct Answer: A
Explanation: Thomson's discovery of electrons is dated to 1897 (closest to option a).
98 Radioactivity was discovered by:
Correct Answer: B
Explanation: Henri Becquerel discovered radioactivity in 1896.
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