CBSE Physics Nuclear Physics Test 2 Online

1. The volume occupied by an atom is greater than the volume of the nucleus by factor of about ?

2. M_p denotes teh mass of a proton and m_n that of a neutron. A given nucleus of binding energy BE, contains Z protons and N neutrons. The mass m(N,Z) of the nucleus is given by ?

3. In a radioactive material the activity at time t₁ is R₁ and at a later time t₂, it is R₂. If the decay constant of the material is λ, then ?

4. Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively. If initially they ave the same number of nuclei. then the ratio of the number of nuclei of X₁ to that of X₂ will be 1/e after a time ?

5. Solar energy is mainly caused due to ?

6. A nuclear reaction given by

_zX^A → _{z +1} Y^A + _-1e° + V- represents ?

7. A nucleus ^A_zX has mass represented by m (A, Z). If m_p and m_n denote the mass of proton and neutron respectively and BE the binding energy (in MeV), then ?

8. The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit) The binding energy of ₂He⁴ is (mass of helium nucleus = 4.0015 u) ?

9. The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an ?

10. If the nucleus ²⁷₁₃ Al has a nuclear radius of about 3.6 fm, then ¹²⁵₅₂ te would have its radius approximately as ?

11. Two radioactive substances A and B have decay constants 5λ and λ respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be [1/e]² After a time interval ?

12. The binding energy of deuteron is 2.2 MeV and that of 42H is 28 MeV. If two deuteron are fused to form one 42He then the energy released is ?

13. In the reaction ²₁H + ³_1H → ⁴₂He + ¹₀n, if the binding energies of ²₁H, ³₁H and ⁴₂He are respectively α, b and c (in MeV), then the energy (in MeV) released in this reaction is ?

14. In radioactive decay process, the negatively charged emitted β-particles are ?

15. A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element in the sample after two mean lives is ?

16. When a deuterium is bombarded on 8O16 nucleus, an α-particle is emitted, then the product nucleus is ?

17. The radius of germanium (Ge) nuclide  is measured to be twice the radius of 94Be. The number of nucleons in Ge are ?

18. If in a nuclear fusion process, the masses of the fusing nuclei be m₁ and m₂ and the mass of the resultant nucleus be m₃, then ?

19. In any fission process the ratio mass of fission products/mass of parent nucleus is ?

20. The mass number of a nucleus is ?

21. The half-life of radium is about 1600 yr. Of 100 g of radium existing now, 25 g will remain unchanged after ?

22. In the nuclear decay given below

^A_zX → _z+1AY → ^A-4_z-1B* → ^{A - 4} _{z - 1} B,

the particles emitted in the sequence are ?

23. Fission of nuclei is possible because the binding energy per nucleon in them ?

24. Which of the following are suitable for the fusion process ?

25. The nuclei of which one of the following pain of nuclei are isotones ?