Prepared by: R.RAJENDRAN, M.A., M.Sc., M.Ed., N.IYNGARAN, M.Sc., M.Ed., M.Phil., 12 TH STANDARD...

Prepared by:R.RAJENDRAN, M.A., M.Sc., M.Ed.,N.IYNGARAN, M.Sc., M.Ed., M.Phil.,

12TH STANDARD PHYSICSNUCLEAR PHYSICS

CHOOSE THE CORRECT ANSWER

1. The atomic nucleus was discovered by ----------------- in

a) Rutherford

b) Thomson

c) Bohr

d) Chadwick.

2. Protons and neutrons inside the nucleus are called -------

a) nuclear forces

b) atomic number

c) nucleons

d) neutral particles.

3. The mass of the proton is --------------- times greater than

the mass of the electron.

a) 1386

b) 1886

c) 1836

d) 3186.

4. The total number of protons and neutrons is called

---------------- number.

a) atomic

b) mass

c) neutron

d) quantum

5. The total number of protons or the total number of

electrons is called ----------------- number.

a) atomic

b) mass

c) neutron

d) quantum

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.

7. The isotopes have different number of --------------------.

a) electrons

b) photons

c) protons

d) neutrons.

8. The --------------- have identical chemical properties.

a) isotones

b) isomers

c) isotopes

9. The atoms of different elements with same mass number

but different atomic number are called ----------.

a) isotones

b) isobars

c) isotopes

10. 8O16 , 7N16 are called --------------------

a) isotones

b) isomers

c) isotopes

11. The isotones of different elements have same number

of --------------------

a) electrons

b) photons

c) protons

d) neutrons.

12. The empirical formula for the nuclear radius is -----------

a) R = ro A⅓

b) R = ro / A⅓

c) R = A⅓ / ro

13. One fermi is ---------------

a) 10-15 m.

b) 10-16 m.

c) 10-10 m.

d) 10-16 m.

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

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

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

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

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

19. The mass of one proton = --------------- amu.

a) 1.009665

b) 1.007772

c) 1.007276

d) 1.008665

20. The mass of one neutron = ------------------ amu.

a) 1.009665

b) 1.007772

c) 1.007276

d) 1.008665

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

22. The energy equivalent of 1 amu is ----------------- .

a) 913 MeV

b) 931 MeV

c) 319 MeV

d) 193 MeV

23. The binding energy = --------------- X C 2.

a) 1 amu

b) binding energy

c) mass defect

d) critical mass.

24. In BE / A curve, for A < 20, there exists peaks to those

nuclei whose mass numbers are multiples of ---------------.

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.

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.

27. BE/A is about ----------- for uranium.

a) 7.6 MeV

b) 8.5 MeV

c) 8.8 MeV

d) 931 MeV.

28. Mass spectrometer is used to find --------------------

a) light spectrum

b) charge

c) isotopic masses

d) velocity

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

30. The force between the nucleons is called --------------- .

a) gravitational force

b) electrostatic force

c) centripetal force

d) nuclear force.

31. Nuclear force is ---------- times stronger than the

gravitational force.

a) 10 40

b) 10 30

c) 10 10

d) 10 15

32. Nuclear force is strong between nucleons which are

less than ------------------ m.

a) 10 -40

b) 10 -30

c) 10 -10

d) 10 -15

33. Nuclear force is due to the continuous exchange of

the particles called ----------------- .

a) leptons

b) baryons

c) photons

d) mesons

34. Radioactivity was discovered by --------------- in the year

a) Marie Currie

b) Pierre Curie

c) Rutherford

d) Henri Becquerel.

35. Radium and polonium were discovered by

----------------------

a) Marie Currie

b) Fajans

c) Rutherford

d) Henri Becquerel.

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.

37. The ---------------- is unaffected by any external agent

like pressure, temperature and electric, magnetic fields.

a) radioactivity

d) ionisation.

38. An α particle is a -------------- nucleus.

a) hydrogen

b) nitrogen

c) oxygen

d) helium

39. The ionising power of α rays is -------------- times

greater than the β rays.

a) 1000

c) 100

d) 10,000

40. The displacement laws were framed by ------------------- .

a) Marie Currie

b) Soddy and Fajans

c) Rutherford

d) Henri Becquerel

41. Radium is converted into radon in the -------------------

decay.

42. In βdecay , the atomic number increases by

---------------- . a) 4

43. Theoretically, ---------------- time is needed for the

disintegration of all the radioactive atoms.

a) infinite

b) zero

c) minimum

d) fractional

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

45. The mean life period is ------------------- proportional to

the decay constant.

a) directly

b) directly and inversely

c) inversely

d) none of the above

46. The rate at which the radioactive atoms decay is

called ----

a) Nuclear fission

b) Nuclear fusion

c) activity

d) none of the above

47. 1 becquerel = ------------------disintegration / second

b) 1000

c) 100

48. The activity of a radioactive substance is generally

expressed in -----------------

a) newton

b) henry

c) curie

d) joule

49. Neutron was discovered by ----------------

a) Newton

b) Henry

c) Curie

d) Chadwick

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

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

52. The half life period of an isolated neutron is

----------------- minutes.

a) 10.1

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.

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.

55. Induced radioactivity was discovered by ------------------

in the year1934.

a) Rutherford & Soddy

b) Chadwick

c) Thomson

d) Irene Curie & Joliot

56. Positron is emitted only in ----------------- radioactivity.

a) radioactivity

d) ionisation.

57. The half life period of 7 N 13* is -------------- minutes.

a) 10.1

58. The half life period of 15 P 30* is ---------------- minutes.

a) 10.1

59. Radio-isotopes can be obtained using the particle

accelerator like ---------------

a) GM counter

b) Cyclotron

c) Mass spectrometer

d) Radio

60. Co 60* is used in the treatment of --------------------

a) checking blood circulation

b) cancer

c) anaemia

d) thyroid glands.

61. Na 24* is used in the treatment of ----------------------- .

b) cancer

c) anaemia

d) thyroid glands.

62. I131* is used in the treatment of ------------------

b) cancer

c) anaemia

d) thyroid glands.

63. Fe 59* is used in the treatment of ------------------

b) cancer

c) anaemia

d) thyroid glands.

64. P 32* is used in the treatment of ----------------------

a) skin diseases.

b) cancer

c) anaemia

d) thyroid glands.

65. The ratio of C14 and C12 atoms in atmosphere is ------

a) 1 : 106

b) 106 : 1

c) 1 : 1015

d) 1 : 1016

66. The half life period of the radio – carbon is ---------------

a) 6550 years

b) 7550 years

c) 5570 years

d) 7570 years

67. The genetic damage is caused by --------------- rays.

68. If the radiation exposure is --------- , it may cause

diseases like leukemia.

a) 300 R

b) 600 R

c) 100 R

d) 250 mR

69. If the radiation exposure is -------------- , it causes

death.

a) 300 R

b) 600 R

c) 100 R

d) 250 mR

70. Safe limit of receiving the radiations is --------------- per

a) 300 R

b) 600 R

c) 100 R

d) 250 mR

71. The intensity of the radioactive radiation is measured

by the device -------------- .

a) GM counter

b) Cyclotron

c) Mass spectrometer

d) Radio

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

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

74. Niels Bohr and John A. Wheeler explained the nuclear

fission by ----------------- model.

a) Thomson atom

b) Rutherford atom

c) nuclear

d) liquid drop

75. Natural uranium consists of ----------- of U238 .

a) 0.28 %

b) 0.72 %

c) 99.28 %

d) 9.28 %

76. Atom bombs were exploded over Nagasaki and

Hiroshima in -------------.

a) India

b) USA

c) Russia

d) Japan

77. Synchrocyclotron can accelerate particles to an

energy of the order of ----------------.

a) 106 eV

b) 103 eV

c) 109 eV

d) 108 eV

78. In PHWR , ---------------- oxide is used as fuel.

a) plutonium

b) thorium

c) silver

d) uranium.

79. The energy value of the thermal neutrons is --------------

a) 1000 eV

b) 10 MeV

c) 200 MeV

d) 0.025 eV

80. Cadmium or boron rods are called as ----------------

a) shielding

b) reflector

c) moderator

d) control

81. A mixture of beryllium with plutonium is used as a

source of ----------------.

a) protons

b) electrons

c) neutrons

d) photons.

82. The boiling point of liquid sodium is --------------- .

a) 10C

b) 100 C

c) 1000C

d) 10000 C

83. The name of the nuclear reactor in Kalpakkam is

------------- .

a) Yamini

b) Kamini

c) BARC

d) Minmini.

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

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

86. The principle involved in hydrogen bomb is --------------

a) nuclear fission

b) nuclear force

c) nuclear fusion

d) nuclear reaction

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

88. In sun , hydrogen and helium are in a state called ------

a) photosphere

b) chromosphere

c) thermosphere

d) plasma.

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.

90. The study of cosmic rays started with ---------------

a) cyclotron

b) GM counter

c) gold leaf electroscope

d) capacitor

91. The intensity of cosmic rays is -------------- at the

equator.

a) maximum

b) zero

c) minimum

d) infinity.

92. The intensity of cosmic rays is maximum at the height

of ------------ km.

93. In pair production, the particles produced are -----------

a) electron - proton

b) electron - positron

c) neutron - proton

d) proton - positron

94. The name cosmic rays was given by --------------.

a) Marie Currie

b) Millikan

c) Rutherford

d) Henri Becquerel.

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

96. The quantum of radiation with no charge and no mass

is called ---------------.

a) electron

b) photon

c) proton

d) neutron.

97. The rest mass of ---------------- vary between 250 me

and 1000 me .

a) electron

b) photon

c) proton

d) mesons

98. The rest mass of the ---------------- vary from 2180 me to

3275 me.

a) hyperons

b) photons

c) protons

d) mesons

100100

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

101101

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

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

102. The nuclei 13Al27 and 14Si28 are example of

(a) isotopes

(b) isobars

(c) isotones

(d) isomers

103103

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

104. Nuclear fission can be explained by

(a) shell model

(b) liquid drop model

(c) quark model

(d) Bohr atom model

105105

105. The nucleons in a nucleus are attracted by

(a) gravitational force

(b) electrostatic force

(c) nuclear force

(d) magnetic force

106106

106. The ionisation power is maximum for

(a) neutrons

(b) α – particles

(c) γ – rays

(d) β − particles

107107

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

108. The radio-isotope used in agriculture is

(a) 15P31

(b)15P32

(c) 11Na23

(d) 11Na24109109

109. The average energy released per fission is

(a) 200 eV

(b) 200 MeV

(c) 200 meV

(d) 200 GeV

110110

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

111. Anaemia can be diagnosed by

(a) 15P31

(b)15P32

(c) 26Fe59

(d) 11Na24112112

112. In the nuclear reaction 80Hg198 + X → 79Au198 + 1H1,

X-stands for

(a) proton

(b) electron

(c) neutron

(d) deutron

113113

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

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

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

106. The half life period of N13 is 10.1 minute. Its life time

(a) 5.05 minutes (b) 20.2 minutes

(c) minutes (d) infinity

117117

6931.0

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

118. The binding energy of 26Fe56 nucleus is

(a) 8.8 MeV

(b) 88 MeV

(c) 493 MeV

(d) 41.3 MeV

119119

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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