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Class 12 Physics: Nucleus
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MCQs on atomic masses, nucleus composition and size, nuclear force, radioactivity and nuclear energy.

Class 12 Physics: Nucleus
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25 Questions

1. Nuclear fission is possible in which of the following cases?
2. Which of the following has the highest neutron ratio?
3. Which of the following is an essential requirement for initiating the fusion reaction?
4. Who measured the size of the nucleus first?
5. In a nuclear reaction, there is the conservation of which of the following?
6. If alpha, beta, and gamma rays carry the same momentum, which has the longest wavelength?
7. The operation of a nuclear reactor is said to be critical if the multiplication factor (k) has a value of what?
8. What is the energy released in a nuclear reaction called?
9. What will happen in a time of 7 hours, if a radioactive substance has an average life of 7 hours?
10. Identify the expression for the nuclear radius from the following.
11. Why is a fusion reaction difficult to perform?
12. The neutron was discovered by whom?
13. What amount of energy is released by deuterium and tritium fusion?
14. In nuclear reactors, what are the controlling rods made of?
15. A nucleus at rest splits into two nuclear parts having radii in the ratio of 1:3. Find the ratio of their velocities.
16. What is the half-time of a radioactive sample (in minutes), if its mean life is 200 s?
17. If elements with principal quantum number n > 4 were not allowed in nature, then what will be the number of possible elements?
18. For uranium nucleus how does its mass vary with volume?
19. Which is a non-central force?
20. What is the reaction responsible for the production of light energy from the sun?
21. The electron emitted in β – radiation originates from where?
22. 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?
23. 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?
24. Uranium 235 mass should be greater than X, then it is capable of continuous fission by itself. Identify X.
25. Which of the following is the main result of nuclear fission?

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