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NCERT CBSE CLASS 12 PHYSICS CHAPTER WISE MCQ

Welcome to your Chapter 13 Nuclei MCQs

1. 
When a radioactive substance emits an α-particle, its position in the periodic table is lowered by which of the following?

2. 
If alpha, beta, and gamma rays carry the same momentum, which has the longest wavelength?

3. 
If elements with principal quantum number n > 4 were not allowed in nature, then what will be the number of possible elements?

4. 
Which of the following is a correct statement?

5. 
Which is a non-central force?

6. 
Which of the following is a stable nucleus?

7. 
Which of the following best define nuclear forces?

8. 
Find the true statement.

9. 
What is the energy released in a nuclear reaction called?

10. 
Which of the following is the main result of nuclear fission?

11. 
Uranium 235 mass should be greater than X, then it is capable of continuous fission by itself. Identify X.

12. 
Which of the following forms the basis of a nuclear reactor?

13. 
Why is a fusion reaction difficult to perform?

14. 
Which of the following substances cannot be emitted by radioactive substances during their decay?

15. 
The electron emitted in β – radiation originates from where?

16. 
A 300-day old radioactive substance shows an activity of 5000 dps, 150 days later its activity becomes 2500 dps. What was its initial activity?

17. 
Which will be the unknown nucleus formed when 22Ne10 decays into two α-particles and an unknown nucleus?

18. 
What will happen in a time of 7 hours, if a radioactive substance has an average life of 7 hours?

19. 
A freshly prepared radioactive source of half-time 2h emits radiation of intensity which is 64 times the permissible safe level. Minimum time after which it would be possible to work safely with this source is which of the following?

20. 
Which of the following is an essential requirement for initiating the fusion reaction?

21. 
What is the reaction responsible for the production of light energy from the sun?

Thank You

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