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Class 12 Physics (Part Ii) Chapter 13 Nuclei Quiz 3 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. Both a fusion reaction and a fission reaction produce

Correct Answer: A) Heat (energy).

2. No charge

Correct Answer: C) $\gamma$.

3. Difference between mass number and atomic number of a nucleus represents

Correct Answer: C) Number of neutrons.

4. Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:

Correct Answer: C) Neutron.

5. The most ionising

Correct Answer: A) $\alpha$.

6. Mass number of a nucleus represents

Correct Answer: D) Number of nucleons.

7. What happens to the atomic number in beta decay?

Correct Answer: C) It increases by 1.

8. This is the type of radiation that naturally occurs in the environment and is generally safe.

Correct Answer: A) Background radiation.

9. How do the atomic number and mass number of a nucleus change during beta decay?

Correct Answer: C) The atomic number increases by 1 and the mass number remains constant.

10. What analogy is used to describe the strong nuclear force?

Correct Answer: B) Magnet covered in velcro.

11. At what distance does the strong nuclear force become repulsive?

Correct Answer: D) Less than 1 femtometer.

12. What is the role of the strong nuclear force in the nucleus?

Correct Answer: B) It keeps the nucleus stable.

13. Over what range is the strong nuclear force attractive?

Correct Answer: C) 0.5 fm to 3 fm.

14. What is the role of the neutrino in beta decay?

Correct Answer: B) To conserve energy.

15. What is emitted alongside a proton during beta decay?

Correct Answer: D) Electron and anti-neutrino.

16. How many types of radiation are there?

Correct Answer: A) 3.

17. Nuclear force is:

Correct Answer: A) Strong, short range and charge independent force.

18. At what distance does the strong nuclear force overcome the electrostatic repulsion force?

Correct Answer: B) $\sim2fm$.

19. The least ionising

Correct Answer: C) $\gamma$.

20. The mass of alpha particle is

Correct Answer: A) Less than the sum of masses of twoprotons and two neutrons.

21. True or False:During nuclear decay atoms of one element can change into atoms of a different element altogether.

Correct Answer: A) True.

22. What shape is a deoxyribose sugar molecule?

Correct Answer: C) Pentagon.

23. The binding energy per nucleon of Deuteron($_{1}$H$^{2}$) and helium nucleus ($_{2}$He$^{4}$) is 1.1 MeVand 7 MeV respectively. If two $_{1}$H$^{2}$ combineto form, $_{2}$He$^{4}$, then energy released is

Correct Answer: B) 23.6 MeV.

24. What makes something radioactive?

Correct Answer: B) An unstable nucleus.

25. Which sequence of radioactive emissions results in the formation of an isotope of the original element?

Correct Answer: B) One $\alpha$ particle and two $\beta$$^{-}$ particles.

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