12th class (Fsc) Physics unit 10 MCQs
76. Which of the following are hadrons:
a. Protons
b. Muons
c. Neutrons
d. Meson
77. Cobalt-60 is the source for:
a. α-rays
b. β-rays
c. γ-rays
d. neutron
78. The mass of beta particle is equal to mass of:
a. Neutron
b. Protons
c. Boron
d. Electrons
79. Which pair belongs to hadrons?
a. Photons and electrons
b. Protons and Neutrons
c. Positrons and electrons
d. Neutrons and electrons
80. Which of the following has no charge?
a. Gamma rays
b. Alpha rays
c. Cathode rays
d. Beta rays
81. Speed of B particles is nearly equal to:
a. 3×108m/s
b. 1×108m/s
c. 1016m/s
d. 1×107m/s
82. The charge number of 
is
a. 85
b. 197
c. 56
d. 141
83. The bombardment of nitrogen with a particle will produce:
a. Electron
b. Neutron
c. Positron
d. Proton
84. Hydrogen bomb is an example of:
a. Chain reaction
b. Nuclear fission
c. Chemical reaction
d. Nuclear fusion
85. Various types of cancer are treated by:
a. Cobalt-60
b. Carbon-14
c. Strontium-90
d. Nickel-63
86. The number of neutron present in a nucleus is given by:
a. N = Z – A
b. N – A + Z
c. N = A X Z
d. N = A – Z
87. Amount of energy released due to complete conversion of 1 kg mass into energy is:
a. 9×1020J
b. 9×1016J
c. 3×108J
d. 9×109J
88. Slow neutrons can cause fission in:
a. Neptunium
b. Uranium-235
c. Lithium
d. Uranium-238
89. What is different in isotopes?
a. Number of electrons
b. Number of protons
c. Charge number
d. Number of neutrons
90. The Curi temperature of iron is:
a. 750 K
b. 125o C
c. 750o C
d. 163o C
91. If we have No number of atoms of any radioactive element, then after four half lives, the number of atoms left behind is:
a. 1/16No
b. 1/4No
c. 1/2No
d. 1/8No
92. In liquid metal fast breeder reactor, the type of Uranium used is:
93. Which one of the following is typical source of α particle ?
a. Cobalt-60
b. Strontium-94
c. Zinc sulphide
d. Radon-222
94. The best place for storing the nuclear wastes is:
a. Damping in desert
b. Ocean
c. Bottom of old salt mines
d. Damping in earth
95. The number of Neutron in 
is:
a. 146
b. 92
c. 330
d. 238
96. One gray (gy) is equal to:
a. 95rad
b. 100rad
c. 97rad
d. 105rad
97. Which of the following are not hadrons?
a. Protons
b. Muons
c. Neutrons
d. Mesons
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