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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. What is the reaction responsible for the production of light energy from the sun?
2. What is the half-time of a radioactive sample (in minutes), if its mean life is 200 s?
3. 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?
4. In nuclear reactors, what are the controlling rods made of?
5. For uranium nucleus how does its mass vary with volume?
6. Which of the following is an essential requirement for initiating the fusion reaction?
7. Which of the following has the highest neutron ratio?
8. Radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains?
9. Which of the following is the main result of nuclear fission?
10. Which is a non-central force?
11. What is the energy released in a nuclear reaction called?
12. What amount of energy is released by deuterium and tritium fusion?
13. Which of the following forms the basis of a nuclear reactor?
14. A nucleus at rest splits into two nuclear parts having radii in the ratio of 1:3. Find the ratio of their velocities.
15. Find the probability that the nucleus of 87Ra221 undergoes decay after three half-lives, if its a radioactive substance which has a half-life of 6 days.
16. Identify the expression for the nuclear radius from the following.
17. 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?
18. Uranium 235 mass should be greater than X, then it is capable of continuous fission by itself. Identify X.
19. Which of the following is a stable nucleus?
20. Why is a fusion reaction difficult to perform?
21. Which of the following is a correct statement?
22. What will happen in a time of 7 hours, if a radioactive substance has an average life of 7 hours?
23. Which will be the unknown nucleus formed when 22Ne10 decays into two α-particles and an unknown nucleus?
24. If elements with principal quantum number n > 4 were not allowed in nature, then what will be the number of possible elements?
25. The magnetic moment of a revolving electron around the nucleus varies with the principal quantum number as which of the following?

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