prepared by: r.rajendran, m.a., m.sc., m.ed., n.iyngaran, m.sc., m.ed., m.phil., 12 th standard...
TRANSCRIPT
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Prepared by:R.RAJENDRAN, M.A., M.Sc., M.Ed.,N.IYNGARAN, M.Sc., M.Ed., M.Phil.,
12TH STANDARD PHYSICSNUCLEAR PHYSICS
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22
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1. The atomic nucleus was discovered by ----------------- in
1911.
a) Rutherford
b) Thomson
c) Bohr
d) Chadwick.
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33
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2. Protons and neutrons inside the nucleus are called -------
a) nuclear forces
b) atomic number
c) nucleons
d) neutral particles.
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44
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3. The mass of the proton is --------------- times greater than
the mass of the electron.
a) 1386
b) 1886
c) 1836
d) 3186.
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55
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4. The total number of protons and neutrons is called
---------------- number.
a) atomic
b) mass
c) neutron
d) quantum
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66
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5. The total number of protons or the total number of
electrons is called ----------------- number.
a) atomic
b) mass
c) neutron
d) quantum
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77
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6. The atoms of the same element with same atomic number
but different mass number are called ----------------.
a) isotones
b) isobars
c) isotopes
d) none of the above.
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88
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7. The isotopes have different number of --------------------.
a) electrons
b) photons
c) protons
d) neutrons.
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99
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8. The --------------- have identical chemical properties.
a) isotones
b) isomers
c) isotopes
d) none of the above.
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1010
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9. The atoms of different elements with same mass number
but different atomic number are called ----------.
a) isotones
b) isobars
c) isotopes
d) none of the above.
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1111
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10. 8O16 , 7N16 are called --------------------
a) isotones
b) isomers
c) isotopes
d) none of the above.
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1212
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11. The isotones of different elements have same number
of --------------------
a) electrons
b) photons
c) protons
d) neutrons.
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1313
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12. The empirical formula for the nuclear radius is -----------
a) R = ro A⅓
b) R = ro / A⅓
c) R = A⅓ / ro
d) none of the above.
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1414
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13. One fermi is ---------------
a) 10-15 m.
b) 10-16 m.
c) 10-10 m.
d) 10-16 m.
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1515
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14. The mass of one nucleon is approximately
----------------- kg.
a) 1.66 X 10– 27
b) 9.11 X 10– 31
c) 6.623 X 10– 34
d) 1.602 X 10– 19
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1616
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15. The nuclear density value is ---------------- kg m -3.
a) 1.816 X 10– 17
b) 9.11 X 10– 31
c) 6.623 X 10– 34
d) 1.816 X 1017
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1717
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16. The charge value one proton is ------------------ C.
a) 1.66 X 10 – 27
b) 9.11 X 10 – 31
c) 6.623 X 10 – 34
d) 1.602 X 10 – 19
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1818
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17. One twelfth of the mass of the carbon atom (6C12)is
called --------------
a) 1 amu
b) binding energy
c) mass defect
d) critical mass
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1919
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18. 1 amu = ----------------- kg.
a) 1.66 X 10 – 27
b) 9.11 X 10 – 31
c) 6.623 X 10 – 34
d) 1.602 X 10 – 19
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2020
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19. The mass of one proton = --------------- amu.
a) 1.009665
b) 1.007772
c) 1.007276
d) 1.008665
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2121
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20. The mass of one neutron = ------------------ amu.
a) 1.009665
b) 1.007772
c) 1.007276
d) 1.008665
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2222
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21. 1 eV = --------------- J.
a) 1.66 X 10 – 27
b) 9.11 X 10 – 31
c) 6.623 X 10 – 34
d) 1.602 X 10 – 19
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2323
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22. The energy equivalent of 1 amu is ----------------- .
a) 913 MeV
b) 931 MeV
c) 319 MeV
d) 193 MeV
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2424
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23. The binding energy = --------------- X C 2.
a) 1 amu
b) binding energy
c) mass defect
d) critical mass.
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2525
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24. In BE / A curve, for A < 20, there exists peaks to those
nuclei whose mass numbers are multiples of ---------------.
a) 6
b) 8
c) 4
d) 2
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2626
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25. Binding energy per nucleon of the iron nucleus is
------------a) 7.6 MeV
b) 8.5 MeV
c) 8.8 MeV
d) 931 MeV.
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2727
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26. BE/A is about ---------------- for nuclei having mass
numbers ranging between 40 and 120.
a) 7.6 MeV
b) 8.5 MeV
c) 8.8 MeV
d) 931 MeV.
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2828
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27. BE/A is about ----------- for uranium.
a) 7.6 MeV
b) 8.5 MeV
c) 8.8 MeV
d) 931 MeV.
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2929
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28. Mass spectrometer is used to find --------------------
a) light spectrum
b) charge
c) isotopic masses
d) velocity
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3030
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29. In Bainbridge mass spectrometer, ---------------
arrangement selects ions of a particular velocity to come
out of it.
a) velocity selector
b) cyclotron
c) slit
d) cathode
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3131
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30. The force between the nucleons is called --------------- .
a) gravitational force
b) electrostatic force
c) centripetal force
d) nuclear force.
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3232
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31. Nuclear force is ---------- times stronger than the
gravitational force.
a) 10 40
b) 10 30
c) 10 10
d) 10 15
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3333
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32. Nuclear force is strong between nucleons which are
less than ------------------ m.
a) 10 -40
b) 10 -30
c) 10 -10
d) 10 -15
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3434
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33. Nuclear force is due to the continuous exchange of
the particles called ----------------- .
a) leptons
b) baryons
c) photons
d) mesons
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34. Radioactivity was discovered by --------------- in the year
1896.
a) Marie Currie
b) Pierre Curie
c) Rutherford
d) Henri Becquerel.
3535
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35. Radium and polonium were discovered by
----------------------
a) Marie Currie
b) Fajans
c) Rutherford
d) Henri Becquerel.
3636
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3737
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36. The phenomenon of spontaneous emission of αβ , γ
rays by elements having atomic number greater than 82
is called --
a) radioactivity
b) induced radioactivity
c) photo electricity
d) ionisation.
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3838
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37. The ---------------- is unaffected by any external agent
like pressure, temperature and electric, magnetic fields.
a) radioactivity
b) induced radioactivity
c) photo electricity
d) ionisation.
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3939
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38. An α particle is a -------------- nucleus.
a) hydrogen
b) nitrogen
c) oxygen
d) helium
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4040
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39. The ionising power of α rays is -------------- times
greater than the β rays.
a) 1000
b) 10
c) 100
d) 10,000
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4141
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40. The displacement laws were framed by ------------------- .
a) Marie Currie
b) Soddy and Fajans
c) Rutherford
d) Henri Becquerel
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41. Radium is converted into radon in the -------------------
decay.
a) α
b) β
c)
d) δ
4242
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4343
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42. In βdecay , the atomic number increases by
---------------- . a) 4
b) 2
c) 1
d) 5
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4444
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43. Theoretically, ---------------- time is needed for the
disintegration of all the radioactive atoms.
a) infinite
b) zero
c) minimum
d) fractional
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4545
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44. The relation between half life period and the decay
constant is T = --------------
a) 0.6931 / 2 λ
b) 0.6931 / λ
c) 0.6931 / 3 λ
d) 0.6931 / 4 λ
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4646
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45. The mean life period is ------------------- proportional to
the decay constant.
a) directly
b) directly and inversely
c) inversely
d) none of the above
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4747
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46. The rate at which the radioactive atoms decay is
called ----
a) Nuclear fission
b) Nuclear fusion
c) activity
d) none of the above
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4848
CHOOSE THE CORRECT ANSWER
47. 1 becquerel = ------------------disintegration / second
a) 10
b) 1000
c) 100
d) 1
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4949
CHOOSE THE CORRECT ANSWER
48. The activity of a radioactive substance is generally
expressed in -----------------
a) newton
b) henry
c) curie
d) joule
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5050
CHOOSE THE CORRECT ANSWER
49. Neutron was discovered by ----------------
a) Newton
b) Henry
c) Curie
d) Chadwick
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5151
CHOOSE THE CORRECT ANSWER
50. 4 Be 9 + 2 He 4 → 6 C 12 + ------------
a) o n 1
b) 1 H 1
c) 1 H 2
d) 2 He 4
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5252
CHOOSE THE CORRECT ANSWER
51. Neutrons are the constituent particles of all nuclei,
except ----------------
a) 1 H 3
b) 1 H 1
c) 1 H 2
d) 2 He 4
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5353
CHOOSE THE CORRECT ANSWER
52. The half life period of an isolated neutron is
----------------- minutes.
a) 10.1
b) 3
c) 13
d) 7
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5454
CHOOSE THE CORRECT ANSWER
53. The energy of a slow moving neutron is ----------------- .
a) 0 to 1000 eV
b) 0.5 MeV to 10 MeV
c) 2 MeV
d) 5 MeV.
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5555
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54. The energy of a fast moving neutron is -------------------
a) 0 to 1000 eV
b) 0.5 MeV to 10 MeV
c) 2 MeV
d) 5 MeV.
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5656
CHOOSE THE CORRECT ANSWER
55. Induced radioactivity was discovered by ------------------
in the year1934.
a) Rutherford & Soddy
b) Chadwick
c) Thomson
d) Irene Curie & Joliot
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5757
CHOOSE THE CORRECT ANSWER
56. Positron is emitted only in ----------------- radioactivity.
a) radioactivity
b) induced radioactivity
c) photo electricity
d) ionisation.
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5858
CHOOSE THE CORRECT ANSWER
57. The half life period of 7 N 13* is -------------- minutes.
a) 10.1
b) 3
c) 13
d) 7
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5959
CHOOSE THE CORRECT ANSWER
58. The half life period of 15 P 30* is ---------------- minutes.
a) 10.1
b) 3
c) 13
d) 7
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6060
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59. Radio-isotopes can be obtained using the particle
accelerator like ---------------
a) GM counter
b) Cyclotron
c) Mass spectrometer
d) Radio
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6161
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60. Co 60* is used in the treatment of --------------------
a) checking blood circulation
b) cancer
c) anaemia
d) thyroid glands.
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6262
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61. Na 24* is used in the treatment of ----------------------- .
a) checking blood circulation
b) cancer
c) anaemia
d) thyroid glands.
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6363
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62. I131* is used in the treatment of ------------------
a) checking blood circulation
b) cancer
c) anaemia
d) thyroid glands.
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6464
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63. Fe 59* is used in the treatment of ------------------
a) checking blood circulation
b) cancer
c) anaemia
d) thyroid glands.
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6565
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64. P 32* is used in the treatment of ----------------------
a) skin diseases.
b) cancer
c) anaemia
d) thyroid glands.
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6666
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65. The ratio of C14 and C12 atoms in atmosphere is ------
a) 1 : 106
b) 106 : 1
c) 1 : 1015
d) 1 : 1016
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6767
CHOOSE THE CORRECT ANSWER
66. The half life period of the radio – carbon is ---------------
a) 6550 years
b) 7550 years
c) 5570 years
d) 7570 years
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6868
CHOOSE THE CORRECT ANSWER
67. The genetic damage is caused by --------------- rays.
a) α
b) β
c)
d) δ
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6969
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68. If the radiation exposure is --------- , it may cause
diseases like leukemia.
a) 300 R
b) 600 R
c) 100 R
d) 250 mR
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7070
CHOOSE THE CORRECT ANSWER
69. If the radiation exposure is -------------- , it causes
death.
a) 300 R
b) 600 R
c) 100 R
d) 250 mR
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7171
CHOOSE THE CORRECT ANSWER
70. Safe limit of receiving the radiations is --------------- per
week.
a) 300 R
b) 600 R
c) 100 R
d) 250 mR
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7272
CHOOSE THE CORRECT ANSWER
71. The intensity of the radioactive radiation is measured
by the device -------------- .
a) GM counter
b) Cyclotron
c) Mass spectrometer
d) Radio
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7373
CHOOSE THE CORRECT ANSWER
72. The most probable mass numbers of the fission
fragments lie between ------------------.
a) 110 to 150
b) 80 to 110
c) 95 and 140
d) 40 to 120
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7474
CHOOSE THE CORRECT ANSWER
73. When 92 U 235 is bombarded with a neutron , the
value of the energy released is ------------.
a) 1000 eV
b) 10 MeV
c) 200 MeV
d) 0.025 eV
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7575
CHOOSE THE CORRECT ANSWER
74. Niels Bohr and John A. Wheeler explained the nuclear
fission by ----------------- model.
a) Thomson atom
b) Rutherford atom
c) nuclear
d) liquid drop
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7676
CHOOSE THE CORRECT ANSWER
75. Natural uranium consists of ----------- of U238 .
a) 0.28 %
b) 0.72 %
c) 99.28 %
d) 9.28 %
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7777
CHOOSE THE CORRECT ANSWER
76. Atom bombs were exploded over Nagasaki and
Hiroshima in -------------.
a) India
b) USA
c) Russia
d) Japan
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7878
CHOOSE THE CORRECT ANSWER
77. Synchrocyclotron can accelerate particles to an
energy of the order of ----------------.
a) 106 eV
b) 103 eV
c) 109 eV
d) 108 eV
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7979
CHOOSE THE CORRECT ANSWER
78. In PHWR , ---------------- oxide is used as fuel.
a) plutonium
b) thorium
c) silver
d) uranium.
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8080
CHOOSE THE CORRECT ANSWER
79. The energy value of the thermal neutrons is --------------
a) 1000 eV
b) 10 MeV
c) 200 MeV
d) 0.025 eV
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8181
CHOOSE THE CORRECT ANSWER
80. Cadmium or boron rods are called as ----------------
rods.
a) shielding
b) reflector
c) moderator
d) control
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8282
CHOOSE THE CORRECT ANSWER
81. A mixture of beryllium with plutonium is used as a
source of ----------------.
a) protons
b) electrons
c) neutrons
d) photons.
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8383
CHOOSE THE CORRECT ANSWER
82. The boiling point of liquid sodium is --------------- .
a) 10C
b) 100 C
c) 1000C
d) 10000 C
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8484
CHOOSE THE CORRECT ANSWER
83. The name of the nuclear reactor in Kalpakkam is
------------- .
a) Yamini
b) Kamini
c) BARC
d) Minmini.
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8585
CHOOSE THE CORRECT ANSWER
84. The total power generation by all the operating power
rea ctors is ------------- .
a) 270 MW
b) 27700 MW
c) 2770 MW
d) 20770 MW
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8686
CHOOSE THE CORRECT ANSWER
85. The process of combining two or more number lighter
nuclei to form a heavy nucleus is --------------- .
a) nuclear fission
b) nuclear force
c) nuclear fusion
d) nuclear reaction
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8787
CHOOSE THE CORRECT ANSWER
86. The principle involved in hydrogen bomb is --------------
a) nuclear fission
b) nuclear force
c) nuclear fusion
d) nuclear reaction
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8888
CHOOSE THE CORRECT ANSWER
87. The energy radiated per second by the sun is --------- J
a) 3.8 X 1028
b) 3.8 X 1026
c) 3.8 X 1022
d) 3.8 X 1024
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8989
CHOOSE THE CORRECT ANSWER
88. In sun , hydrogen and helium are in a state called ------
a) photosphere
b) chromosphere
c) thermosphere
d) plasma.
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9090
CHOOSE THE CORRECT ANSWER
89. In proton – proton cycle fusion, the energy released is
in the order of ------------ .
a) 36.7 MeV
b) 26.7 MeV
c) 16.7 MeV
d) 46.7 MeV.
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9191
CHOOSE THE CORRECT ANSWER
90. The study of cosmic rays started with ---------------
a) cyclotron
b) GM counter
c) gold leaf electroscope
d) capacitor
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9292
CHOOSE THE CORRECT ANSWER
91. The intensity of cosmic rays is -------------- at the
equator.
a) maximum
b) zero
c) minimum
d) infinity.
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9393
CHOOSE THE CORRECT ANSWER
92. The intensity of cosmic rays is maximum at the height
of ------------ km.
a) 42
b) 90
c) 20
d) 30
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9494
CHOOSE THE CORRECT ANSWER
93. In pair production, the particles produced are -----------
a) electron - proton
b) electron - positron
c) neutron - proton
d) proton - positron
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9595
CHOOSE THE CORRECT ANSWER
94. The name cosmic rays was given by --------------.
a) Marie Currie
b) Millikan
c) Rutherford
d) Henri Becquerel.
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9696
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95. The energy of the primary cosmic rays is in the order
of -------------------- .
a) 107 eV
b) 108 eV
c) 109 eV
d) 106 eV
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9797
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96. The quantum of radiation with no charge and no mass
is called ---------------.
a) electron
b) photon
c) proton
d) neutron.
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9898
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97. The rest mass of ---------------- vary between 250 me
and 1000 me .
a) electron
b) photon
c) proton
d) mesons
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9999
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98. The rest mass of the ---------------- vary from 2180 me to
3275 me.
a) hyperons
b) photons
c) protons
d) mesons
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100100
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99. 1 H 3 + 1 H 2 → 2 He 4 + -------------- + energy.
a) 1 H 1
b) o n 1
c) 1 H 2
d) 1 H 3
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101101
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100. In GM counter, the potential difference of about -------
is applied through a high resistance of ---------
a) 100 V, 100 MΩ
b) 100 V, 1000 MΩ
c) 1000 V, 100 MΩ
d) 100 V, 10 MΩ
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101. The nuclear radius of 4Be8 nucleus is
(a) 1.3 × 10−15 m
(b) 2.6 × 10−15 m
(c) 1.3 × 10−13 m
(d) 2.6 × 10−13 m
102102
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102. The nuclei 13Al27 and 14Si28 are example of
(a) isotopes
(b) isobars
(c) isotones
(d) isomers
103103
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103. The mass defect of a certain nucleus is found to be
0.03 amu. Its binding energy is
(a) 27.93 eV
(b) 27.93 KeV
(c) 27.93 MeV
(d) 27.93 GeV
104104
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104. Nuclear fission can be explained by
(a) shell model
(b) liquid drop model
(c) quark model
(d) Bohr atom model
105105
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105. The nucleons in a nucleus are attracted by
(a) gravitational force
(b) electrostatic force
(c) nuclear force
(d) magnetic force
106106
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106. The ionisation power is maximum for
(a) neutrons
(b) α – particles
(c) γ – rays
(d) β − particles
107107
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107. The half life period of a certain radioactive element
with disintegration constant 0.0693 per day is
(a) 10 days
(b) 14 days
(c) 140 days
(d) 1.4 days
108108
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108. The radio-isotope used in agriculture is
(a) 15P31
(b)15P32
(c) 11Na23
(d) 11Na24109109
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109. The average energy released per fission is
(a) 200 eV
(b) 200 MeV
(c) 200 meV
(d) 200 GeV
110110
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110. The explosion of atom bomb is based on the
principle of
(a) uncontrolled fission reaction
(b) controlled fission reaction
(c) fusion reaction
(d) thermonuclear reaction
111111
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111. Anaemia can be diagnosed by
(a) 15P31
(b)15P32
(c) 26Fe59
(d) 11Na24112112
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112. In the nuclear reaction 80Hg198 + X → 79Au198 + 1H1,
X-stands for
(a) proton
(b) electron
(c) neutron
(d) deutron
113113
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113. In β – decay
(a) atomic number decreases by one
(b) mass number decreases by one
(c) proton number remains the same
(d) neutron number decreases by one
114114
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114. Isotopes have
(a) same mass number but different atomic number
(b) same proton number and neutron number
(c) same proton number but different neutron number
(d) same neutron number but different proton number
115115
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115. The time taken by the radioactive element to reduce
to 1/e times is
(a) half life
(b) mean life
(c) half life/2
(d) twice the mean life
116116
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106. The half life period of N13 is 10.1 minute. Its life time
is
(a) 5.05 minutes (b) 20.2 minutes
(c) minutes (d) infinity
117117
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6931.0
1.10
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117. Positive rays of the same element produce two
different traces in a Bainbridge mass spectrometer.
The positive ions have
(a) same mass with different velocity
(b) same mass with same velocity
(c) different mass with same velocity
(d) different mass with different velocity118118
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118. The binding energy of 26Fe56 nucleus is
(a) 8.8 MeV
(b) 88 MeV
(c) 493 MeV
(d) 41.3 MeV
119119
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119. The ratio of nuclear density to the density of
mercury is about
(a) 1.3 × 1010
(b) 1.3
(c) 1.3 × 1013
(d) 1.3 × 104
120120
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