Nuclei
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Nuclei
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25 Questions

1. In the nucleus of 11Na23 - the number of protons - neutrons and electrons are [1991]
2. Which of the following statements is true for nuclearforces? [1990]
3. 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]
4. Fusion reaction takes place at high temperaturebecause [2011]
5. The energy equivalent of one atomic mass unit is[1992]
6. 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]
7. The average binding energy of a nucleon inside anatomic nucleus is about [1989]
8. 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]
9. The mass density of a nucleus varies with massnumber A as [1992]
10. 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
11. The most penetrating radiation of the following is[1997]
12. The mass number of He is 4 and that for sulphurisThe radius of sulphur nuclei is larger than that ofhelium by [1994]
13. A deuteron strikes 8O16 nucleus with subsequentemission of an alpha particleIdentify the nucleus soproduced [2002]
14. 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]
15. The constituents of atomic nuclei are believed tobe [1991]
16. How does the binding energy per nucleon varywith the increase in the number of nucleons? [NEETKar.2013]
17. If the nuclear radius of 27Al is 3.6 Fermi - theapproximate nuclear radius of 64Cu in Fermi is: [2012]
18. Ultraviolet radiations of 6.2 eV falls on an aluminumsurfaceK.Eof fastest electron emitted is (work function= 4.2 eV) [1989]
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. The half-life of radium is 1600 yearsThe fractionof a sample of radium that would remain after 6400years [1991
21. Half-lives of two radioactive substances A and Barerespectively 20 minutes and 40 minutesInitially - thesamples of A and B have equal number of nucleiAfter80 minutes the ratio of remaining numbers of A and Bnuclei is [1998
22. An electron with (rest mass m 0) moves with aspeed of 0.8 cIts mass when it moves with this speed is[1991]
23. Solar energy is due to [1992]
24. A radioactive element has half life period 800 years.After 6400 years what amount will remain? [1989]
25. A sample has 4 × 10 16 radioactive nuclei of half life10 daysThe number of atoms decaying in 30 days is[2002]

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