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-particle of mass, When an a-P 48s m moving w;, “velocity V bomberds on a heavy sain —, sharge Ze, its distance of closest appr nie, from the nucleus depends on m i ‘oach, , on INEET 2016}, _ > (c)m 1, @ In m 4d) =, the half-life of a radioactive substance is, 30 minutes. The time (in minutes) taken, between 40% decay and 85% decay of, the same radioactive(substance is, , [NEET 2016], ) 15 ) 30, , (c) 45 60, j radius of the we Al nucleus is taken to be, , R,,, then the radius of 12576 nucleus is, fy 53, , nearly [CBSE AIPMT 2015], 1, , i) (99 \3 5, , @) (=) Ry, Ara, , 1, , 3 13)3, =R, d 4 R, , =a (3) Fa, , 4Anucleus of uranium decays at rest into, , tuclei of thorium and helium. Then,, [CBSE AIPMT 2015], , Sitthe helium nucleus has more kinetic energy, , 8 than the thorium nucleus, | he helium nucleus has less momentum than, , the thorium nu, cleus, "the helium nucleus has more momentum than, , (te thorium nucleus ;, helium nucleus has less kinetic energ, , thorium nucleus, , y than, , |yuclear Physicg, , , , &. ie binding energy per nucleon of 7 Li and, 2He nuclei are 5.60 MeV and 7.06 MeV,, , respectively. In the nuclear reaction, ; 4, 3Li+{}H— He + $He + Q, the value of, , energy Q released is [CBSE AIPMT 2014], (a) 19.6 MeV (b) - 2.4 MeV, (c) 8.4 MeV ) 17.3 MeV, , 6. A radio isotope X with a half life 1.4 x 10”, yr decays of Y which is stable. A sample of, the rock from a cave was found to contain, X and Yin the ratio 1 : 7. The age of the, , Tock is [CBSE AIPMT 2014], (a) 1.96 x 10° yr (by'392 x 10° yr, (o) 4.20 x 10° yr (d) 8.40 x 10° yr, , 7. The half-life of a radioactive isotope X is, 20 yr. It decays to another element Y, which is stable. The two elements X and Y, were found to be in the ratio 1:7 ina, sample of a given rock. The age of the rock, is estimated to be [NEET 2013], , (a) 40 yr (py'60 yr (d) 100 yr, 8. A certain mass of hydrogen is changed to, , helium by the process of fusion. The mass, defect in fusion reaction is 0.02866 u. The, , energy liberated per u is, (given 1 u=931 MeV), (a) 2.67 MeV, _{oy0.675 MeV, 9, A mixture consists of two radioactive, materials A, and A, with half lives of 20 8, and 10 s respectively. Initially the mixture, , (c) 80 yr, , (NEET 2013], , (b) 26.7 MeV, (d) 13.35 MeV

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300, , has 40, 8of A, of 1 And 160 i, the two in the mow 8. Ae. The amount, , equal after mixture will become, , (a) 605 )80 (CBSE AIPMT 2012), 10. A radioacti See ee, , photos, eee Nucleus of mass M emits a, , recoil Tequency v and the nucleus, , s. Doi, The recoil energy will be, JO pe? (CBSE AIPMT 2011), a ViRMe%b) zero (c)hv (i) Mc? - Av, <0 pig of a radioactive isotope X is, is oni lecays to another element Y which, found e. The two elements X and Y were, ind to be in the ratio of 1: 15 ina, sample of a given rock. The age of the rock, was estimated to be [CBSE AIPMT 2011], a} 200 yr (0) 250 yr (c) 100 yr_ (d) 150 yr, 12. Fusion reaction takes place at high, temperature because [CBSE AIPMT 2011], (a) atoms get ionised at high temperature, fb)kinetic energy is high enough to overcome the, coulomb repulsion between nuclei, (c) molecules break up at high temperature, {d) nuclei break up at high temperature, , 13. A nucleus 7X emits one a-particle and two, , B- particles. The resulting nucleus is, [CBSE AIPMT 2011], , @"ez prix @mY @ per4, , 14. The mass of a 7Li nucleus is 0.042u less, than the sum of the masses of all its, nucleons. The binding energy per nucleon, of 7Linucleus is nearly [CBSE AIPMT 2010], (a) 46 MeV 0) 5. 6 MeV (c) 3.9 MeV (d) 23 MeV, , 15. The activity of a radioactive sample is, measured as N, counts per minute att = 0, and N,/e counts per minute att = 5 min., The time (in minute) at which the activity, reduces to half its value is [CBSE AIPMT 2010], , 5, ‘5 (b) —— 51, (a) log, 2/5 (b) —— > (0) 510g492 Jaf Slog, 2, , 16. 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 [CBSE AIPMT 2009], (a) isobar of parent (b) isomer of parent, (c) isotone of parent isotope of parent, , {!, NERT Chapterwise Solutions ~ Phyaie, v 0, u, , gs”, iven below pf 9% 9, 17. In the nuclear decay # ', Ay » 0:48 » Ore yz), ex a : = @ sé, j in the sequence a, the particles emitted {CBSE Ame / en, (b) 1 B.@ (B18 Oa .™ a 3, el jals X, and x p, 18. Two radioa’ tive mater 1 ane X, have we, ” sengy constants 52 and A respectively, decay (0 ney have the same number of ‘, initially atio of the number of d, nuclei, the? the fi 7 (, a X, will be, nuclei of X1 to that of Xz = after t, ICBSE AIPMT 2099) $ — t, time 1, yo 4 at ., @r 2 a x yer, e * pstances A and B have @ 2, 0 radioactive su 1 , 2, 19. io constants 52. and 2 respectively. 4; p, lecay the same number of nucle; 2, , t =o they have ., The ratio of number of nuclei of A to those p® ;, , 1 ., : oe, i 1) after a time interval, of B will be *) e! [CBSE AIPMT 2007 o, 2a zl a, @a = wae i) a 8, @, 20. If the nucleus 27 al has a nuclear radius of @°, about 3.6 fm, then $°Tewould have its» iss, , radius approxi ately as [CBSE AIPMT 2007) pid, 6.0fm (b) 9.6 fm (c) 12.0 fm (d) 4.8 fm, , @!, , 21. A nucleus 7X has mass represented by, , m(A, Z). If mp and m,, denote the mass of a, proton and neutron respectively and BE @, , the binding energy (in MeV), then, [CBSE AIPMT 2007) @, , (a) BE = [m(A, Z) - Zm, -(A-Z) mle?, , AeyBE = [Zm, + (A- Z)m, -m(A Z)\c?, (c) BE = [Zm, + Am, - m(A, 2)? ', (d) BE = m(A, Z)- Zm, -(A- 2),, , 22, In radioactive decay process, the negatively, , charged emitted B-particles are, [CBSE AIPMT 2007], , (a) the electrons present inside the nucleus 4, _{b)thfe electrons produced as a result of the |, decay of neutrons inside the nucleus, (c) the electrons produced as a result of collisions, between atoms, (d) the electrons orbiting around the nucleus, , —_—- wow ea

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Physics, feat, ul!, , s of germanium (Ge) nuclide is, to be twice the radius of {Be., , g meas” aber of nucleons in Ge are, penum [CBSE AIPMT 2006], , e radiu, , 3 (b) 74 (c) 75 fd) 72, : radioactive material the activity at, in and at a later time t,, it is R,. If, , I, isR, , dimes Vv constant of the material is A,, , a, ie doe [CBSE AIPMT 2006], renee ta) ()R, = Rp e* 12), ", ty =R, , ing energy of deuteron is 2.2 MeV, , int, 5 . that of 3Heis 28 MeV. If two, < are fused to form one 3He, then, [CBSE AIPMT 2006], , 23.6 MeV, (d) 30.2 MeV, , jp any fission process the ratio, % of fission products i, ass of parent nucleus (CBSE AIPMT 2005], , 7, Fission of nuclei is possible because the, , binding energy pet nucleon in them, [CBSE AIPMT 2005], , (a) increases with mass number at high mass, numbers, , _Drdecreases with mass number at high mass, numbers, , (0) increases with mass number at low mass, umbers |, , (6) decreases with mass number at low mass, numbers, , 28. The nuclei of which one of the following, pairs of nuclei are isotones ?, , [CBSE AIPMT 2005], tar Se”, Ga” (b) 4gMo™, goZr?, (0) 5S, Sr (4) nC, 16S, , Fei 2H+ 3H — #He+ gn, if the, ing energies of 2H, 3H and 4Heare, "spectively a, b and c (in MeV), then the, , ‘nergy (in MeV) released in this reaction is, [CBSE AIPMT 2005], , 301, , (ajo+a=b, (c)a+b+e, , WE ab, , (d)a+b-c, , 50. m, denotes the mass of a proton and m,, in, , 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 [CBSE AIPMT 2004], , (a) m(N, Z) = Nm, + ZM, ~ Bec?, (b) m(N, Z)=Nm, + Zm, + BEo*, fo) m(N, Z)=Nm, + Zm, ~ BE/c*, (d) m(N, Z)=Nm, + Zm, + BE/c?, , 31. The half-life of radium is about 1600 yr. Of, 100 g of radium existing now, 25 g will, remain unchanged after [CBSE AIPMT 2004], , (a) 4800 yr (b) 6400 yr (c) 2400 yr Ad) 3200 yr, , 32. If in a nuclear fusion process, the masses, , of the fusing nuclei be m, and m, and the, , mass of the resultant nucleus be m,, then, [CBSE AIPMT 2004], , (a) m, =™M, + M2 (b) mg =| ™ - MoI, fe} my < (m, + M2) (d) m, > (m, + M,), 33. 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 [CBSE AIPMT 2003], (a) 3.709 (b) 6.309, (971.359 (d) 2.509, , 34. A nuclear reaction given by, 7X4 7.:Y* + 1¢° + V represents, [CBSE AIPMT 2003], (a) fusion (b) fission fe) B-decay (d) y-decay, 35. Solar energy is mainly caused due to, [CBSE AIPMT 2003], , _fprtusion of protons during synthesis of heavier, elements, , (b) gravitational contraction, , (c) burning of hydrogen in the oxygen, , (d) fission of uranium present in the sun, , 36. The mass of proton is 1.0073 u and that of, neutron is 1.0087 u (u = atomic mass unit), The binding energy of ,He’ is (mass of, helium nucleus = 4.0015 u), , [CBSE AIPMT 2003], (ey 28.4 MeV (b) 0.061 u, (c) 0.0305 J (d) 0.0305 erg

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302, , 37. The mass number of a nucleus is, [CBSE AIPMT 2003], _{a) sometimes equal to its atomic number, (b) sometimes less than and sometimes more, than its atomic number, (c) always less than its atomic number, (d) always more than its atomic number, 38. The volume occupied by an atom is greater, than the volume of the nucleus by factor of, [CBSE AIPMT 2003], , about, 5 10! (d) 10°, , (a)10° — ey 0, , 16, , 39. When a deuterium is bombarded on 0, nucleus, an o-particle is emitted, then the, product nucleus is [CBSE AIPMT 2002], (a) >NB (b) Be (c) Be? : 4 4, , 40. Which of the following are suitable for the, fusion process ? [CBSE AIPMT 2002], , ex Light nuclei, , (b) Heavy nuclei, (c) Elements lying in the middle of periodic table, , (d) Elements lying in the middle of binding energy, curve, 41.A sample of radioactive elements contains, 4x 10'° active nuclei. If half-life of, element is 10 days, then the number of, decayed nuclei after 30 days is, , [CBSE AIPMT 2002], (a) 05 x 10"° (b)2 x 10°, ford5x 10° (d) 1x 10"°, 42. In compound X(n, al) > 3Li’, the element, Xis [CBSE AIPMT 2001], (a) He* pf.8 (0) 5B") ,Be"’, , 43. Half-life of a radioactive substance is 12.5, h and its mass is.256 g. After what time,, the amount of remaining substance is 1g 4%, , [CBSE AIPMT 2007], (ay75h _foy100h (co) 125h = (d) 150, , * 44, Half-life period of a radioactive substance, is 6 h. After 24 h activity is 0.01 1.C, what, was the initial activity ? [CBSE AIPMT 2001], (a)0.04yC (b)008"C (c) 024yC (70.16 nC, 45, In nuclear fission process, energy is, released because [CBSE AIPMT 2001}, (a) mass of products is more than Mass of, , nucleus, ‘otal binding energy of products torrned due to, , nuclear fission is hore than the parent, fissionable material, , <<, , NEET Chapterwise Solut;, Uutions ~ Phys f, , (c) total binding energy of products toy $, , nuclear fission is less than par,, a Cd, material = Parent fissionapye® 094, é ;, to, , (d) mass of some particles ;, isconveredinioges, 7, , 46. wy Jp, , Son ‘s eles of Proton sad oe Z, pectively. An el e, , ement of mag, hd, , m has Z protons and N neu, ‘trons, thi, » then e, (a) m> Zm, + Nm, ICBSE Aipyy , +, :, (b) m= Zm, + Nm, F200 Pye, <Zm, + Nm, of, (d) mmay be greater than, less than OF equay ; yo!, , é, Zm, + Nm, , depending on nature of eleren, —) ajc, 47. Which of the following is positively oo, , , , charged ? {CBSE AIPM ie, 2 {, , fayé-particle Wppaticn Wg, , (c) yrays (d) X-rays a, 48. A nuclear decay is expressed as ‘, wept!, «Cl —> BY +B +x om, , Then the unknown particle X is [CBSE AIPMT 2000} gt, , (a) neutron (b) antineutrino ‘3, , (c) proton Ady'neutrino ive, , 49. The half-life of a radioactive material is 3, h. If the initial amount is 300 g, then after pg, 18 h, it will remain [CBSE AIPMT 2000) 2, , He 4.68 g (0) 46.89, (0) 9.3759 (d) 93.75, (6, , 450. The relationship between disintegration +, , constant (A) and half-life (7) will be ., [CBSE AIPMT 2000) #59, , r, , (a= 002 6) =a? _—, _T _ logy € "adi, (C)A jog, 2 3 Rr Sao is Mal, “aay, , 51. Nuclear fission can be explained by, [CBSE AIPMT 2000] We, , (a) proton-proton cycle ey, _feY liquid drop model of nucleus ‘, , (c) independent of nuclear particle model uy, , (d) nuclear shell model & 2, 52, In one a and 2 B-emissions ;cgse AIPMT 1999) wt, , (a) mass humber reduces by 2 ‘, , (b) mass number reduces by 6 7, , (6) atomic number reduces by 2 tiga, , os eae nuthber remains unchanged