300+ TOP MCQs on Radioactivity and Answers

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. Here, you will discover the NEET Physics MCQs and Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Radioactivity Multiple Choice Questions make you feel confident in answering the question in the

MCQs on Radioactivity :

1. The neutral atoms of all isotopes of the same element contain the same number of __________.
(A) neutrons only.
(B) Electrons
(C) Mass numbers
(D) Masses

Answer

Answer: (B) Electrons

2. The atomic number is not changed by which type of radioactive decay?
(A) Beta
(B) Gamma
(C) Alpha
(D) The atomic number is affected by all forms of radioactive decay

Answer

Answer: (B) Gamma

3. Isotopes of an element have a different number of
(A) Proton
(B) Neutron
(C) Electron
(D) atom

Answer

Answer: (B) Neutron

4. Three types of radioactive elements are emitted when unstable nuclei undergo radioactive decay. Which of the following is not one of them
(A) Beta
(B) Gamma
(C) Alpha
(D) delta

Answer

Answer: (D) delta

5. A nuclear fission reaction becoming self-sustaining depends on
(A) electrons
(B) Neutrons
(C) Energy
(D) Protons

Answer

Answer: (B) Neutrons

6. Helium nuclei particles are called
(A) Gamma particles
(B) Beta particles
(C) Alpha particles
(D) No particles that are helium nuclei

Answer

Answer: (C) alpha particles

7. When two atomic nuclei combine it is called as
(A) Chain reaction
(B) Nuclear fusion
(C) Nuclear decay
(D) Nuclear fission

Answer

Answer: (B) Nuclear fusion

8. The number of protons or atomic number is reduced to 2 by which form of radioactive decay?
(A) Beta-decay
(B) Gamma decay
(C) Alpha decay
(D) None of the above

Answer

Answer: (C) Alpha decay

9. Which statement is true for all three types of radioactive emission?
(A) They are deflected by electric fields
(B) They ionise gases
(C) They are completely absorbed by a thin aluminium sheet
(D) They emit light

Answer

Answer: (B) They ionise gases

10. A nuclide of the element plutonium 94 Pu 242. What is the number of neutrons in its nucleus?
(A) 242
(B) 336
(C) 148
(D) 94

Answer

Answer: (C) 148

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