Nuclear Structure – Online MCQs – Physics 10th

1. In alpha decay, the proton number or atomic number, Z of the parent nuclide reduces by _________ while its atomic mass or nucleon number, A, decreases by __________.

2. A powder contains 100mg of a radioactive material that emits α-particles. The half-life of the isotope is five days. The mass of isotope that remains after ten days will be:

3. In radiosurgery, a strong gamma emitter __________ is used.

4. A radioactive decay can be represented as shown. ₆C¹⁴ → ₇N¹⁴ + . . . . The emitted particle is a/an:

5. It is the most dangerous of all other radioactive radiations.

6. They carry no electric charge.

7. The safest way to dispose of a large quantity of radioactive waste is:

8. High penetrating power of gamma rays is due to their:

9. α-particles has a charge of:

10. Various types of cancer are treated by:

11. The main source of energy in the stars is:

12. The heaviest isotopes (proton number, Z > 83) decay by _________ emissions.

13. A scientist experiments using a seated source that emits β-particles. The range of the β-particles in the air is about 30cm. The precaution that is the most effective to protect the scientist from radiation is:

14. A radioactive element emits a particle from the nucleus of one of its atoms. The particle comprises two protons and two neutrons. The name of this process is called:

15. In the graph of unstable nuclei, stable isotopes lie:

16. During nuclear fusion of hydrogen into helium:

17. A radioactive decay can be represented as shown. ₈₈Ra²²⁶ → ₈₆Rn²²² + . . . . The emitted particle is a/an:

18. In the core of the sun hydrogen is being converted into helium. This is called:

19. Radioactive materials should be handled carefully. Which safety measure does not reduce the risk of using radioactive material?

20. Isotopes above the stability line have: