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101. The fast breeder reactor uses the following moderator__________________?
A. demineralised water
B. carbon dioxide
C. heavy water
D. graphite
E. no moderator is used
102. The mass number of a substance represents the sum of total number of___________________?
A. protons and neutrons in an atom
B. protons and electrons in an atom
C. neutrons and electrons in an atom
D. protons and neutrons in a nucleus
E. protons and electrons in a nucleus
103. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?
A. same
B. more
C. less
D. there is no such criterion
E. none of the above
104. Gas cooled reactor uses following materials as moderator, and coolant____________________?
A. graphite, C02
B. graphite, air
C. heavy water, C02
D. lead, H2
E. concrete, N2
105. In nuclear fission each neutron that causes fission releases_______________?
A. no new neutron
B. at least one new neutron
C. one new neutron
D. more than one new neutrons
E. many-fold neutrons
106. Which of the following particles is the lightest__________________?
A. nucleus
B. electron
C. proton
D. meson
E. neutron
107. In fast breeder reactors___________________?
A. any type of moderator can be used
B. graphite is used as the moderator
C. heavy water is used as the moderator
D. moderator may or may not be used
E. moderator is dispensed with
108. Ferrite material is____________________?
A. the most fissionable material
B. the basic fuel for nuclear paints
C. basic raw material for nuclear plants
D. the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
E. none of the above
109. The energy required to be applied to a radioactive nucleus for the emission of a neutron is________________?
A. 1 MeV
B. 2.4 MeV
C. 4.3 MeV
D. 7.8 MeV
E. 20 MeV
110. The commonly used material for shielding is__________________?
A. lead or concrete
B. lead and tin
C. graphite or cadmium
D. thick galvanised sheets
E. black carbon papers