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 15 of 17)

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99 The charge on electron was discovered by Millikan in:
Correct Answer: C
Explanation: Millikan's oil-drop experiment (1909) measured $e$.
100 Structure of the nucleus was explained by:
Correct Answer: D
Explanation: Rutherford proposed the nuclear model in 1911.
101 Rutherford discovered proton in:
Correct Answer: B
Explanation: Rutherford identified protons in 1919 (closest to option b).
102 The diameter of an atom is of the order:
Correct Answer: C
Explanation: Atomic diameters are ~$10^{-10}\text{m}$ (1 Ångström).
103 An atom of an element differs from an atom of one of its isotopes in the number of:
Correct Answer: A
Explanation: Isotopes vary in neutron count.
104 Nuclei that have the same charge number but different mass number are called:
Correct Answer: C
Explanation: Isotopes share atomic number (protons) but differ in mass number (neutrons).
105 One amu is equal to:
Correct Answer: A
Explanation: 1 amu = $1.66 \times 10^{-27}\text{kg}$ (closest to option a; typo in options).
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