Nuclei
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Nuclei
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25 Questions

1. The nuclei 6C13 and 7N 14 can be described as [1990]
2. The most penetrating radiation of the following is[1997]
3. In the nucleus of 11Na23 - the number of protons - neutrons and electrons are [1991]
4. The mass density of a nucleus varies with massnumber A as [1992]
5. The constituents of atomic nuclei are believed tobe [1991]
6. 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]
7. The volume occupied by an atom is greater thanthe volume of the nucleus by a factor of about [2003]
8. 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]
9. Solar energy is due to [1992]
10. The count rate of a Geiger Muller counter for theradiation of a radioactive material of half-life 30 minutesdecreases to 5 sec-“1 after 2 hoursThe initial count ratewas [1995]
11. The energy equivalent of one atomic mass unit is[1992]
12. Heavy water is used as a moderator in a nuclearreactorThe function of the moderator is [1994]
13. The stable nucleus that has a radius half that ofFe56 is [1997]
14. Ultraviolet radiations of 6.2 eV falls on an aluminumsurfaceK.Eof fastest electron emitted is (work function= 4.2 eV) [1989]
15. If in nuclear fusion process the masses of the fusingnuclei be m 1 and m 2 and the mass of the resultantnucleus be m 3 - then [2004]
16. A deuteron strikes 8O16 nucleus with subsequentemission of an alpha particleIdentify the nucleus soproduced [2002]
17. 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]
18. Which of the following statements is true for nuclearforces? [1990]
19. 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]
20. 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]
21. 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
22. The mass number of He is 4 and that for sulphurisThe radius of sulphur nuclei is larger than that ofhelium by [1994]
23. The half-life of radium is 1600 yearsThe fractionof a sample of radium that would remain after 6400years [1991
24. Fusion reaction takes place at high temperaturebecause [2011]
25. Two nuclei have their mass numbers in the ratio of1: 3The ratio of their nuclear densities would be [2008]

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