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Class 12 Physics (Part Ii) Chapter 13 Nuclei Quiz 1 (25 MCQs)

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1. If the total binding energies of $_{1}$H$^{2}$, $_{2}$He$^{4}$, $_{26}$Fe$^{56}$, $_{92}$U$^{235}$nuclei are 2.2 MeV, 28.3 MeV, 492 MeV and 1786 MeV respectively, identify the most stable nucleus.

Correct Answer: C) Iron.

2. Which process involves the splitting of large nuclei?

Correct Answer: D) Nuclear fission.

3. One milligram of matter converted intoenergy will give

Correct Answer: D) $9x10^{10}J$.

4. What does the conservation of charge in beta decay imply?

Correct Answer: D) Total charge remains unchanged.

5. How do the atomic number and mass number of a nucleus change during alpha decay?

Correct Answer: B) The atomic number decreases by 2 and the mass number decreases by 4.

6. Charge of $+2e$

Correct Answer: A) $\alpha$.

7. Fusion takes place at high temperature because:

Correct Answer: D) Kinetic energy is high enough to overcome repulsion between nuclei.

8. What is the approximate diameter of a nucleon?

Correct Answer: C) $1.5fm$.

9. Light energy emitted by star is due to:

Correct Answer: B) Joining of nuclei.

10. If Z represents atomic number and A represents mass number of a nucleus, then charge of the nucleus is (e=magnitude of charge of electron)

Correct Answer: D) +Ze.

11. Which nucleons electrostatically repel each other?

Correct Answer: A) Protons.

12. What force is responsible for holding the nucleus together?

Correct Answer: C) Strong nuclear force.

13. What is the strong force responsible for?

Correct Answer: B) Holding protons and neutrons together.

14. The mass number of He is 4 and that forsulphur is 32. The radius of sulphur nucleusis larger than that of helium by

Correct Answer: D) 2.

15. Atomic number of a nucleus represents

Correct Answer: A) Number of protons.

16. A stable atom has:

Correct Answer: A) Equal numbers of Protons & Electrons.

17. Which decay process includes a neutrino?

Correct Answer: B) Beta decay.

18. The energy released in a typical fusion reaction is approximately

Correct Answer: D) 25MeV.

19. Alpha particle

Correct Answer: A) $\alpha$.

20. The density of a nucleus is of the order of:

Correct Answer: C) 10$^{17}$ kg m$^{-3}$.

21. The mass number of a nucleus is A and its atomic number is Z. The number of neutrons in the nucleus is:

Correct Answer: A) A-Z.

22. Beta radiation is:

Correct Answer: B) A high speed electron.

23. Ratio of the radii of the nuclei with mass numbers 8 and 27 will be:

Correct Answer: C) 2:3.

24. Complete the nuclear reaction$_{85}$$^{209}$At = ..... + $_{2}$$^{4}$He

Correct Answer: A) $_{83}$$^{205}$Bi.

25. Charge of $-1e$

Correct Answer: B) $\beta^-$.

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