Nuclei
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Nuclei
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25 Questions

1. An electron with (rest mass m 0) moves with aspeed of 0.8 cIts mass when it moves with this speed is[1991]
2. 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]
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. A deuteron strikes 8O16 nucleus with subsequentemission of an alpha particleIdentify the nucleus soproduced [2002]
5. A sample has 4 × 10 16 radioactive nuclei of half life10 daysThe number of atoms decaying in 30 days is[2002]
6. Which of the following is used as a moderator innuclear reactors? [1997]
7. Fusion reaction takes place at high temperaturebecause [2011]
8. The volume occupied by an atom is greater thanthe volume of the nucleus by a factor of about [2003]
9. The mass number of He is 4 and that for sulphurisThe radius of sulphur nuclei is larger than that ofhelium by [1994]
10. 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]
11. The stable nucleus that has a radius half that ofFe56 is [1997]
12. Two nuclei have their mass numbers in the ratio of1: 3The ratio of their nuclear densities would be [2008]
13. The half-life of radium is 1600 yearsThe fractionof a sample of radium that would remain after 6400years [1991
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 power obtained in a reactor using U 235disintegration is 1000 kWThe mass decay of U 235 perhour is [2011]
16. 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
17. The mass density of a nucleus varies with massnumber A as [1992]
18. Curie is a unit of [1989]
19. If the nuclear radius of 27Al is 3.6 Fermi - theapproximate nuclear radius of 64Cu in Fermi is: [2012]
20. 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]
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. The nuclei of which one of the following pairs ofnuclei are isotones? [2005]
23. Which of the following statements is true for nuclearforces? [1990]
24. The nuclei 6C13 and 7N 14 can be described as [1990]
25. 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]

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