Number of secondary neutrons emitted on fission of an atom of U-235 on slow neutron bombardment is
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The main ore of thorium is
A. pitchblende
B. monazite
C. limonite
D. galena
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Which is used as a coolant in nuclear reactor due to high neutron capture cross-section?
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Which is not a fissile nuclear material?
A. U-233
B. U-235
C. U-238
D. Pu-239
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Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature & pressure limits of the reactor?
A. Molten sodium cooled reactor
B. CO2 gas cooled reactor
C. Pressurized water reactor
D. Boiling water reactor
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Thorium metal
A. resembles steel in appearance
B. is less hard (in the range of silver)
C. is highly ductile
D. all A, B & C
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Liquid metal (e.g., molten sodium) is preferred as a coolant in case of a/an . . . . . . . . reactor.
A. homogeneous
B. graphite moderated
C. fast breeder
D. enriched uranium (3% U-235) fuelled
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Pick out the wrong statement about a fast breeder reactor. A fast breeder reactor
A. uses molten sodium as moderator
B. converts fertile fuel into fissile fuel
C. requires highly enriched fuel
D. produces more fuel than it consumes
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Which of the following is the best nuclear fuel?
A. Np - 239
B. U - 234
C. Pu - 239
D. Th - 236
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Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactors?
A. Nitrogen
B. Helium
C. Carbon dioxide
D. Hydrogen
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Which of the following factors is the most important in the site selection for a nuclear power plant?
A. Absence of earthquake prone zone in nearby areas
B. Abundant availability of water
C. Remotely located from residential areas
D. Proximity to fuel source
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The main purpose of control rod in a nuclear reactor is to control the
A. chain reaction & hence the power output by regulating the number of secondary neutrons for fission
B. emission of hazardous radiation
C. conversion of fissile material into fertile material
D. velocity of the secondary neutrons
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Extraction of uranium from its ore is done by . . . . . . . . method.
A. chemical
B. physical beneficiation
C. electrometallurgical
D. pyrometallurgical
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Artificially produced radioactive isotopes are used for
A. power generation
B. treatment of certain diseases
C. initiating nuclear fission & fusion
D. all A, B & C
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Light water' used as a coolant in nuclear reactor is nothing but . . . . . . . . water.
A. ordinary
B. mildly acidic (pH = 6)
C. mildly alkaline (pH = 8)
D. none of these
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Radioactive decay is a . . . . . . . . order reaction.
A. zero
B. first
C. second
D. thrid
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Critical energy should be . . . . . . . . the neutron binding energy of the atom in order to initiate a nuclear fission.
A. equal to
B. less than
C. more than
D. either more or less
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A boiling water reactor is the one, in which the
A. coolant water is allowed to boil in the core of the reactor
B. coolant water, after being heated in the reactor core, generates steam in a boiler
C. pressurised water is pumped into the core
D. fuel & the coolant are thoroughly mixed to form a homogeneous solution
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Disintegration rate of a radioactive element
A. progressively increases
B. progressively decreases
C. remains constant throughout
D. may increase or decrease with time
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Which of the following may be used to measure the rate of nuclear disintegration?
A. Geiger-Muller counter
B. Cyclotron
C. Cloud chamber
D. Mass spectrograph
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