CBSE Physics Nuclear Physics Test Online

1. In the nucleus of ₁₁Na²³, the number of protons, neutrons and electrons are ?

2. The constituents of atomic nuclei are believed to be ?

3. An element A decays into element C by a two step process

A → B + ₂He⁴

B → C + 2e^-

Then ?

4. The ratio of the radii of the nuclei ₁₃Al2⁷ and ₅₂Te¹²⁵ is approximately ?

5. A radioactive sample with  half-life of 1 month has teh label : 'Activity = 2 microcurie on 1-8-1991'. What would be its activity two months earlier ?

6. If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by F_pp, F_nn and F_pn respectively, then ?

7. The average binding energy of a nucleon inside an atomic nucleus is about ?

8. A radioactive element has half-life period 800 yr. After 6400 yr what amount will remain ?

9. Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is ?

10. Energy released in the fission of a single ₉₂U²³⁵ nucleus is 200 MeV. The fission rate of a ₉₂U²³⁵ filled reactor operating at a power level of 5 W is ?

11. Curie is a unit of ?

12. If the binding energy per nucleon in ₃Li⁷ and ₂He⁴ nuclei are respectively 5.60 MeV and 7.06 MeV, then the energy of proton  in the reaction ₃Li⁷ + P 2 ₂He⁴ is ?

13. The binding energy per nucleon is maximum in case of ?

14. The half-life of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr ?

15. What is the respective number of α and β particle emitted in the following radioactive decay

²⁰⁰X₉₀ ¹⁶⁸Y₈₀ ?

16. The mass density of a nucleus varies with mass number A as ?

17. In a given reaction

_zX^A  → z+1 Y^A → _z-1 K^A-4 → _z-1 K^A-4

Radioactive radiations are emitted in the sequence of ?

18. The nuclei ₆C¹³ and, N¹⁴ can be described as ?

19. The nucleus ₄₈Cd¹¹⁵, after two successive β-decay will give ?

20. Which of the following statements is true fro nuclear forces ?

21. The nucleus ₆C¹² absorbs an energetic newton and emits a particle (β). The resulting nucleus is ?

22. The energy equivalent of one atomic mass unit is ?

23. Solar energy is due to ?

24. The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nuclei is larger than that of helium by ?

25. What is the radius of iodine atom ( Atomic No. 53, Mass No. 126) ?