Nuclei
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Nuclei
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25 Questions

1. The average binding energy of a nucleon inside anatomic nucleus is about [1989]
2. The nuclei of which one of the following pairs ofnuclei are isotones? [2005]
3. A certain mass of Hydrogen is changed to Heliumby the process of fusionThe mass defect in fusionreaction is0.02866 a.m.uThe energy liberated per a.m.u.is (Given: 1 a.m.u = 931 MeV) [2013]
4. The mass of proton is 1.0073 u and that of neutronis 1.0087 u (u = atomic mass unit)The binding energy of42He is [2003]
5. A nucleus ruptures into two nuclear parts - whichhave their velocity ratio equal to 2 : 1 What will be theratio of their nuclear size (nuclear radius)? [1996]
6. Solar energy is due to [1992]
7. Which of the following is used as a moderator innuclear reactors? [1997]
8. Mp denotes the mass of a proton and Mn that of aneutronA given nucleus - of binding energy B - contains Zprotons and N neutronsThe mass M(N - Z) of thenucleus is given by (c is the velocity of light) [2004]
9. The half-life of a radioactive nucleus is 50 days.The time interval (t 2 -“ t 1) between the time t 2 when 2/3of it has decayed and the time t 1 when 1/3 of it haddecayed is: [2012]
10. If the nuclear radius of 27Al is 3.6 Fermi - theapproximate nuclear radius of 64Cu in Fermi is: [2012]
11. The mass density of a nucleus varies with massnumber A as [1992]
12. The activity of a radioactive sample is measured as9750 counts per minute at t =0 and as 975 counts perminute at t = 5 minutesThe decay constant isapproximately [1997]
13. The binding energy per nucleon in deuterium andhelium nuclei are 1.1 MeVand 7.0 MeV - respectively.When two deuterium nuclei fuse to form a heliumnucleus the energy released in the fusion is:[2008]Z) Mn -“BE/c2
14. Which of the following statements is true for nuclearforces? [1990]
15. The energy equivalent of one atomic mass unit is[1992]
16. Ultraviolet radiations of 6.2 eV falls on an aluminumsurfaceK.Eof fastest electron emitted is (work function= 4.2 eV) [1989]
17. How does the binding energy per nucleon varywith the increase in the number of nucleons? [NEETKar.2013]
18. The volume occupied by an atom is greater thanthe volume of the nucleus by a factor of about [2003]
19. A mixture consists of two radioactive materials A 1and A2 with half lives of 20s and 10s respectively.Initially the mixture has 40 g of A 1 and 160 g of A 2Theamount of the two in the mixture will become equalafter: [2012]
20. The stable nucleus that has a radius half that ofFe56 is [1997]
21. The half-life of radium is 1600 yearsThe fractionof a sample of radium that would remain after 6400years [1991
22. Heavy water is used as a moderator in a nuclearreactorThe function of the moderator is [1994]
23. The most penetrating radiation of the following is[1997]
24. A radioactive element has half life period 800 years.After 6400 years what amount will remain? [1989]
25. In the nucleus of 11Na23 - the number of protons - neutrons and electrons are [1991]

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