InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Statement-1 : `._(56)^(133)Ba + e^(-) to ._(55)^(133)Cs +` X-ray Because State-2 : Atomic number of daughter nuclide decreses by one unit in K-electron capture.A. Statement-1 is true, Statement-2 is ture, statement-2 is a correct explanation for statement -1B. Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1C. Statement-1 is ture, statement-2 is falseD. Statement-2 is false, statement-2 is true |
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Answer» Correct Answer - b Nucleus may capture electron from K-shell and the vacancy is filled by electrons from higher shell, X-rays released in the process. |
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| 52. |
Which of the following does not contain material particles?A. `alpha`-raysB. `beta`-raysC. `gamma`-raysD. Anode rays |
| Answer» Correct Answer - c | |
| 53. |
A device used for the measurement of radioactivity isA. mass spectrometerB. cyclotronC. nuclear reactorD. GM counter |
| Answer» Correct Answer - d | |
| 54. |
In the sequence of the following nuclear reaction, `X_(98)^(238) overset(-alpha)(to) Y overset(-beta)(to)L overset(nalpha)(to) ._(90)M^(218)` What is the value of n?A. 3B. 4C. 5D. 6 |
| Answer» Correct Answer - b | |
| 55. |
The half life period of `._(58)^(141)Ce` is 13.11 days. It is a `beta`-particle emitter and the average energy of the `beta`-particle emitted is 0.442 MeV. What is the total energy emitted per second in watts by 10 mg of `._(58)^(141)Ce`? |
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Answer» Rate of disintegration per sec =` lambda xx` No. atoms `= (0.693)/(13.11 xx 24 xx 60 xx 60) xx (6.023 xx 10^(23))/(141) xx 0.01` Total `beta`- particles emitted ` 2.61 xx 10^(23)` Total energy emittd `= 2.61 xx 10^(13) xx 0.422 = 1.1536 xx 10^(12) MeV` Energy in erg `= (1.1536 xx 10^(13))(1.6 xx 10^(-6))` Energy in watt `= (1.536 xx 10^(13) xx 1.6 xx 10^(-6))/(10^(7)) = 1.84` watt |
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| 56. |
During the transformation of `._(c )^(a)X` of `._(d)^(b)Y` the number of `beta`-particle emitted are:A. `(a - b)/(4)`B. `d + (a-b)/(2) + c`C. `d + ((a - b)/(2)) - c`D. 2c - d + a - b |
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Answer» Correct Answer - c No of `alpha`particles `= ((a - b)/(4))` `Z_(1) - 2 alpha + beta = Z_(2)` `beta = Z_(2) - Z_(1) + 2 alpha` `= d - c + 2 ((a - b))/(4)` `= d + ((a - b))/(2) - c` |
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| 57. |
Which of the following transformation is not correct?A. `._(33)^(75)As + ._(2)^(4)He to ._(35)^(78)Br + ._(0)^(1)n`B. `._(3)^(7)Li + ._(1)^(1)H to ._(4)^(7)Be + ._(0)^(1)n`C. `._(21)^(45)Sc + ._(0)^(1)n to ._(20)^(45)Ca + ._(0)^(1)n`D. `._(83)^(209)Bi + ._(1)^(2)H to ._(84)^(210)Po + ._(1)^(1)n` |
| Answer» Correct Answer - c | |
| 58. |
The reaction `._(92)U^(235) + ._(0)n^(1) rarr ._(56)Ba^(140) + ._(36)Kr^(93) + 3 ._(0)n^(1)` representsa)Artificial radioactivityb)Nuclear fissionc)Nuclear fusiond)None of theseA. artificial radioactivityB. nuclear fissionC. nuclear fussionD. none of the above |
| Answer» Correct Answer - b | |
| 59. |
(A) Any kind of exchange force helps the nucleus to be more destabilised. (R ) `pi`-mesons are exchanged between nucleons incessantly.A. If both (A) and (R ) are correct and (R ) is the correct explanation for (A).B. If both (A) and (R ) are correct but (R ) is not the correct explanation for (A )C. If both (A) and (R ) are incorrect.D. If both (A) and (R ) are incorrect. |
| Answer» Correct Answer - D | |
| 60. |
In nuclear fission, 0.01% mass is converted into energy. The energy released by the fission of 100 kg mass will be:A. `9 xx 10^(15) j`B. `9 xx 10^(11) kJ`C. `9 xx 10^(17) j`D. `9 xx 10^(13) J` |
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Answer» Correct Answer - b `Delta m = 100 xx (0.01)/(100) = 0.01 kg` `E = Delta mc^(2) = 0.01 xx (3 xx 10^(8))^(2) J` `= 9 xx 10^(14) J = 9 xx 10^(11) kJ` |
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| 61. |
Match the Column-I with Column-II: `{:("Column-I","Column-II"),((a) ._(1)^(2)D + ._(1)^(3)T to ._(2)^(4)He + ._(0)^(1)n + "Energy",(p) beta - "emission"),((b)._(4)^(9)Be + ._(2)^(4)He to ._(6)^(12)C + ._(0)^(1)n,(q) "Artificial transmutation"),((c )._(12)^(24)Mg + ._(2)^(4)He to ._(14)^(27)Si + ._(0)^(1)n, (r) "Discovery of neutrons"),((d)._(0)^(1)n to ._(1)^(1)H + ._(+1)^(0)e,(s) "Hydrogen bomb"):}` |
| Answer» Correct Answer - (a-s)(b-q-r)(c-q)(d-p) | |
| 62. |
Which of the following statement is/are correct?A. Nuclear fusion produces more energy than nuclear fissionB. Nuclear fusion take place at very high temperature `(10^(6) K)`C. Nuclear fusion yields radioactive productD. Nuclear fusion involves chain reaction |
| Answer» Correct Answer - a,b,c | |
| 63. |
For radioactive decay:A. `t_(3//4) = 2 t_(1//2)`B. `t_(7//8) = 3 t_(1//2)`C. `t_(99%) = 2 t_(90%)`D. `t_(90%) = (10)/(3) t_(50%)` |
| Answer» Correct Answer - a,b,c,d | |
| 64. |
Which one of the following is an exact example of article radioactive?A. `._(11)^(23)Na + ._(0)^(1)n to ._(11)^(24)Na + gamma` `._(11)^(24)Na + ._(1)^(1)H to ._(12)^(24)Mg + ._(0)^(1)n`B. `._(2)^(4)He + ._(7)^(14)N to ._(8)^(17)O + ._(1)^(1)H` `._(8)^(17)O + ._(0)^(1)n to ._(7)^(18)O + ._(1)^(1)H`C. `._(2)^(4)HE + ._(13)^(27)Al to ._(15)^(30)P + ._(0)^(1)n` `._(15)^(30)P to ._(14)^(30)Si + ._(-1)^(0)e`D. `._(238)^(89)Ac to ._(90)^(224)Th + beta` `._(90)^(228)Th to ._(88)^(224)Ra + alpha` |
| Answer» Correct Answer - c | |
| 65. |
Half-life-speed of lead is:A. zeroB. infiniteC. 1590 yearsD. 1590 days |
| Answer» Correct Answer - b | |
| 66. |
Which of the following is the best nuclear fuel?A. `.^(238)U`B. `.^(236)U`C. `.^(239)Pu`D. `.^(239)Np` |
| Answer» Correct Answer - c | |
| 67. |
Among the following, which has the longest half life?A. `._(90)^(232)Th`B. `._(93)^(237)Np`C. `._(92)^(238)U`D. `._(92)^(235)U` |
| Answer» Correct Answer - a | |
| 68. |
A radioactive atom `X` emits a `beta-`particle to produce an atom `Y` which then emits an Particle to give an atom `Z` (1) the atomic number of `X` is less than that of `Z`. (2) the atomic number of `Y` is less than that of `Z`. (3) the mass number of `X` is the same as that of `Y`.A. 1,2 and 3 are correctB. 1 and 2 are correctC. 2 and 3 are correctD. 3 is correct |
| Answer» Correct Answer - d | |
| 69. |
In treatment of cancer, which of the following is used?A. `._(53)^(131)I`B. `._(15)^(32)P`C. `._(27)^(60)Co`D. `._(1)^(2)H` |
| Answer» Correct Answer - c | |
| 70. |
Select the wrong statement among the followingA. Antieutrino can be detected during `beta`-emissionB. Neutrino was predicted to conserve the spin of a nuclear reaction.C. Synchrotron can accelerate neutronsD. Area of cross-section of nucleus is about 1 barn (1 barn `= 10^(24) cm^(2)`) |
| Answer» Correct Answer - c | |
| 71. |
Liquid sodium is used in nuclear reactor. What is its function?A. ti collect the reaction productB. to act as heat exchangerC. to absorb the neutrons in order to control the chain reactionD. to absorb as moderator to slow down the neutrons |
| Answer» Correct Answer - b | |
| 72. |
Select the wrong statement (S):A. Nuclear isomers contain the same number of protons and neutronsB. The decay constant is independent of the amount of the substance takenC. 1 curie `= 3.7 xx 10^(10)` disD. actinium series starts with `.^(238)U` |
| Answer» Correct Answer - a,b | |
| 73. |
In a nuclear reactor, heavy water is usedA. transfer the heat from the reactorB. provide high speed neutrons for the fission reactionC. reduce the speed of fast moving neutoronsD. increase the speed of neutrons |
| Answer» Correct Answer - a,c | |
| 74. |
`._(88)^(228) X - 3 alpha - beta to Y`. The element Y is:A. `._(82)^(216)Pb`B. `._(82)^(217)Pb`C. `._(83)^(218)Bi`D. `._(83)^(216)Bi` |
| Answer» Correct Answer - b | |
| 75. |
Statement-I : Mass numbers of most of the elements are fractional. Because Statemen-II Mass numbers are obtained by comparing with the mass number of carbon taken as 12.A. If both (A) and (R ) are correct and (R ) is the correct explanation for (A).B. If both (A) and (R ) are correct but (R ) is not the correct explanation for (A )C. If both (A) and (R ) are incorrect.D. If both (A) and (R ) are incorrect. |
| Answer» Correct Answer - D | |
| 76. |
Which radioactive isotope is used to detect tumours?A. `.^(74)As`B. `.^(24)Na`C. `.^(131)I`D. `.^(60)Co` |
| Answer» Correct Answer - a | |
| 77. |
(A) The activity of 1 g pure uranium-235 will be greater than the same amount present in `U_(3) O_(6)` (R ) In the combined state, the activity of the radioactive element decreases.A. If both (A) and (R ) are correct and (R ) is the correct explanation for (A).B. If both (A) and (R ) are correct but (R ) is not the correct explanation for (A )C. If both (A) and (R ) are incorrect.D. If both (A) and (R ) are incorrect. |
| Answer» Correct Answer - D | |
| 78. |
In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0) +` Antineutrino + Energy `4 ._(1)H^(1) rarr ._(2)He^(4) + 2 ._(+1)e^(0) +` Energy Then, emission of these particles changes the nuclear configuration and results into a daughter nuclide. Emission of an `alpha`-particles results into a daughter element having atomic number lowered by 2 and mass number by 4, on the other hand, emission of a `beta`-particle yields an element having atomic number raised by 1. During `beta`-decay, the mass of atomic nucleusA. decrease by 1 unitB. increases by 1 unitC. decreases by 2 unitD. remains unaffected |
| Answer» Correct Answer - d | |
| 79. |
In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0) +` Antineutrino + Energy `4 ._(1)H^(1) rarr ._(2)He^(4) + 2 ._(+1)e^(0) +` Energy Then, emission of these particles changes the nuclear configuration and results into a daughter nuclide. Emission of an `alpha`-particles results into a daughter element having atomic number lowered by 2 and mass number by 4, on the other hand, emission of a `beta`-particle yields an element having atomic number raised by 1. Which of the following combinations give finally an isotope of the parent element?a)alpha, alpha, beta`b)`alpha, gamma, alpha`c)`alpha, beta, beta`d)`beta, gamma, alpha`A. `alpha, alpha, beta`B. `alpha, gamma, alpha`C. `alpha, beta, beta`D. `beta, gamma, alpha` |
| Answer» Correct Answer - c | |
| 80. |
In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0) +` Antineutrino + Energy `4 ._(1)H^(1) rarr ._(2)He^(4) + 2 ._(+1)e^(0) +` Energy Then, emission of these particles changes the nuclear configuration and results into a daughter nuclide. Emission of an `alpha`-particles results into a daughter element having atomic number lowered by 2 and mass number by 4, on the other hand, emission of a `beta`-particle yields an element having atomic number raised by 1. A radioactive element belongs to `III B` group, it emits ona `alpha`- and `beta`-particle to form a daughter nuclide. The position of daughter nuclide will be inA. IIAB. IAC. IIBD. IVB |
| Answer» Correct Answer - a | |
| 81. |
In the disintegration of a radioactive element, `alpha` and `beta`-particles are evolved from the nucleus: `._(0)^(1)n to ._(1)^(1)H + ._(-1)^(0)e` + Antineutrino + Energy `4 ._(1)^(1)H to ._(2)^(4)He + 2 ._(+1)^(0)e` + Energy Then, emission of these particles changes the nuclear configuration and results into a daughter nuclide. Emission of an `alpha`-particles results into a daughter element having atomic number lowered by 2 and mass number by 4, on the order hand, emission of a `beta`-particle yields an element having atomic number raised by one. soddy and Fajan proposed that the daughter nuclide may occupy different positions in the periodic talbe. Select the correct statements amont the following:A. Emission of a `beta` particle results into isobar of parent elementB. Emission of a `beta`-particles results into isodiaphere of parent elementC. Emisson of one `alpha` and two `beta` particle results into isotope of the parenet elementD. Emission of `gamma`-radiations may yield nuclear isomer |
| Answer» Correct Answer - a,b,c,d | |
| 82. |
`._(7)^(14)N` is attacked by doubly charged helium ion, it emits a proton and:A. `._(9)^(18)F`B. `._(8)^(17)O`C. `._(8)^(18)O`D. `._(9)^(19)F` |
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Answer» Correct Answer - b `._(7)^(14)N + ._(2)^(4)He to ._(8)^(17)O + ._(1)^(1)H` |
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| 83. |
Which of the following is the man-made radioactive disintegration series?A. Thorium seriesB. Neptunium seriesC. Uranium seriesD. Actinium series |
| Answer» Correct Answer - b | |
| 84. |
Fill in the blank `""_(92)U^(235) +""_(0)n^(1) to ? +""_(36)^(92)Kr + 3""_(0)^(1)n`A. `._(56)^(141)Sr`B. `._(56)^(141)La`C. `._(56)^(141)Ba`D. `._(56)^(141)Cs` |
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Answer» Correct Answer - c Let symbol of element is `._(Z)^(M)P`. 92 = Z + 36 `:.` Z = 56 235 + 1 M + 92 + 3 M = 141 Thus, the element P will be `._(56)^(141)Ba` |
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| 85. |
Fill in the blank `""_(92)U^(235) +""_(0)n^(1) to ? +""_(36)^(92)Kr + 3""_(0)^(1)n`A. `._(52)^(137)Te`B. `._(55)^(144)Cs`C. `._(56)^(137)Ba`D. `._(56)^(144)Ba` |
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Answer» Correct Answer - d `._(92)^(235)U + ._(0)^(1)n to ._(26)^(90)Kr + ._(56)^(144)Ba + 2 ._(0)^(1)n` |
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| 86. |
The density of a nucleus is of the order ofA. `10^(5) kg m^(-3)`B. `10^(10) kg m^(-3)`C. `10^(17) kg m^(-3)`D. `10^(25) kg m^(-3)` |
| Answer» Correct Answer - c | |
| 87. |
Fill in the blank space with a suitable answer selected from the list below. Write only the letter (A,B,C…..etc.) of the correct answer in the blanks `{:((i) ._(6)^(12)C + ._(1)^(1)H to ._(7)^(13)N,A : "Projectile" "capture"),((ii) ._(13)^(27)Al + ._(1)^(1)H to ._(12)^(24)Mg + ._(2)^(4)He,B : "Spallation"),((iii) ._(92)^(235)U + ._(0)^(1)n to ._(56)^(140)Ba + ._(36)^(93)Kr + 3 ._(0)^(1)n, C : "Fusion"),((iv) ._(33)^(75)As + ._(1)^(2)H to ._(25)^(56)Mn + 9 ._(1)^(1)H + 12 ._(0)^(1)n, D : "Projectile" "capture" "and" "particle" "emission"),((v) ._(1)^(2)H + ._(1)^(3)H to ._(2)^(4)He + ._(0)^(1)n, E :"fission"):}` Select the correct answers according to the given codes:A. `{:(,(i),(ii),(iii),(iv),(v)),((a),A,D,E,B,C):}`B. `{:(,(i),(ii),(iii),(iv),(v)),((b),D,C,A,E,B):}`C. `{:(,(i),(ii),(iii),(iv),(v)),((C ),A,B,C,D,E):}`D. `{:(,(i),(ii),(iii),(iv),(v)),((d ),E,D,C,B,A):}` |
| Answer» Correct Answer - a | |
| 88. |
Radioactive material is deacign with `t_(1//2) = 30` days on being, separated into two fractions , one of the fracation, immediately after separation decays with `t_(1//2) = 2` days. The other fraction, immediately after separation, would show:A. constant activityB. increasing activityC. decay with `t_(1//2) = 30` daysD. decay with `t_(1//2) = 28` days |
| Answer» Correct Answer - b | |
| 89. |
Calculate the mass of `C^(14)` (half life =5720 years) atoms give `3.7xx10^(7)` disintegrations per second. |
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Answer» Let the mass of `.^(14)C` atoms be m.g Number of atoms in mg of `.^(14)C = (m)/(14) xx 6.02 xx 10^(23)` `lambda = (0.693)/("half life") = (0.693)/(5720 xx 65 xx 24 xx 60 xx 60) = 3.84 xx 10^(-12) sec^(-1)` We know that, `- (dN)/(dt) = lambda .N` i.e., Rate of disintegration `= lambda xx` no. of atoms `3.7 xx 10^(7) = (0.693)/(5720 xx 365 xx 24 xx 60 xx 60) xx (m)/(14) xx 6.02 xx 10^(23)` `3.7 xx 10^(7) = (3.84 xx 10^(-12) xx m xx 6.02 xx 10^(23))/(14)` |
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| 90. |
Natural uranium consists of `.^(235)U`:A. 0.99B. 0.5C. 0.1D. 0.007 |
| Answer» Correct Answer - d | |
| 91. |
A radioactive substance (parent) decays to its daughter element . The age of radioactive substance (t) is related to the daughter (d)/parent (p) ratio by the equation :A. `t = (1)/(lambda) In ((D)/(P))`B. `t = (1)/(lambda) In (1 + (P)/(D))`C. `t = (1)/(lambda) In (1 + (D)/(P))`D. `t = (1)/(lambda) In (2 + (D)/(P))` |
| Answer» Correct Answer - c | |
| 92. |
Radioactive substance has a constant activity of 2000 disintegrations per minute. The material is separated into two fractions, one of which has an initial activity of 1000 disintegration per second while the other fraction decays with `t_(1//2) = 24` hours. The total activity in both sample after 48 hours of separation is :A. 1500B. 1000C. 1250D. 2000 |
| Answer» Correct Answer - d | |
| 93. |
A radioactive element `X` has an atomic number of 100. It decays directly into an element `Y` which decays directly into an element `Z`. In both the processes either one `alpha` or one `beta-` particle is emitted. Which of the following statement could be true?A. Y has an atomic number of 102B. Y has an atomic number of 101C. Z has an atomic number of 100D. Z has an atomic number of 99 |
| Answer» Correct Answer - b,d | |
| 94. |
Let us consider emission of `alpha`particle from uranium nucleus: `._(92)^(235)U - ._(2)He^(4) to ._(90)Th^(231)` `{:(e = 92, e = 0, e = 90),(p = 92, p = 2, p = 90),(n = 143, n = 2, n = 141):}` shortage of two electorns in thorium is due to:A. conversion of electrons to positronB. combination with positron to evolve energyC. annihilationD. absorption in the nucleus |
| Answer» Correct Answer - b,c | |
| 95. |
Enrichment of uranium is made by :A. distillationB. diffusionC. evaporationD. bleaching |
| Answer» Correct Answer - b | |
| 96. |
Which of the following is not a fissionalbe material?A. `.^(235)U`B. `.^(238)U`C. `.^(233)U`D. `.^(239)Pu` |
| Answer» Correct Answer - b | |
| 97. |
Which of the following is not the inverse square law force?A. Electric forceB. Gravitational forceC. Nuclear forceD. Magnetic force between two poles |
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Answer» Correct Answer - c Nucleus forces are short range force which do not obey inverse squre law |
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| 98. |
Assuming that about `200 MeV` of energy is released per fission of `._(92)U^(235)` nuceli, the mass of `U^(235)` consumed per day in a fission ractor of power `1` megawatt will be approximately .A. `10^(-2)g`B. 1 gC. 100 gD. 1000 g |
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Answer» Correct Answer - b `1 MW = 10^(6) xx 24 xx 60 xx 60 J` Number of fissions `= (24 xx 6 xx 6 xx 10^(8))/(200 xx 10^(6) xx 1.6 xx 10^(-19)) = 2.7 xx 10^(21)` Mass of uranium `= 2.7 xx 10^(21) xx 235 xx 1.66 xx 10^(-24) = 1.05 g` |
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| 99. |
What is the binding energy of the hydrogen nucleus?A. zeroB. 13.6 eVC. More than 13.6 eVD. Infinite |
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Answer» Correct Answer - a Nucleus of hydrogen has only one protons, hence its binding energy will be zero |
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| 100. |
Which statement is true about n/p ratio?A. It increases by `beta`- emissionB. It increases by `alpha` emissionC. It increases by `gamma`-emissionD. None of the above |
| Answer» Correct Answer - b | |