Nuclear Structure – Online MCQs – Physics 10th

1. γ-rays are deflected by:

2. During nuclear fusion of hydrogen into helium:

3. The α-radiation is:

4. 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 __________.

5. Which one of these particles has the shortest penetrating ability?

6. They carry no electric charge.

7. 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:

8. ₁H² + ₁H³ → ₂He⁴ + ₀n¹ + energy. This reaction is an example of:

9. In the core of the sun hydrogen is being converted into helium. It takes ________ hydrogen atoms to fuse into each helium atom.

10. Nuclei join the nucleons through another specific:

11. 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:

12. Gamma radiations are:

13. The splitting of a heavy nucleus into smaller nuclei is called:

14. A process in which two light nuclei combine to form a heavier nucleus is called:

15. Isotopes below the line of stability:

16. If the radioactive source is placed inside the electric field, this radiation does not change its direction.

17. α-particles has a charge of:

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

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

20. The danger from these particles is minimal.