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Q.1
Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
Heavy water
Graphite
Carbon dioxide
No moderator is needed
Q.2
A fission chain reaction in uranium can be developed by
Slowing down fast neutrons so that Uz fission continues by slow motion neutrons
Accelerating fast neutrons
Absorbing all neutrons
Using moderator
Q.3
The total energy released in fission of U is
5 MeV
10 MeV
199 MeV
168 MeV
Q.4
Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal
Centrifugal
Axial
Reciprocation
Electromagnetic
Q.5
Artificial radioactive isotopes find application in
Power generation
Nucleonic devices
Nuclear fission
Medical field
Q.6
Solid fuel for nuclear reactions may be fabricated into various small shapes such as
Plates
Pallets
Pins
Any one of the above
Q.7
The fast breeder reactor uses the following moderator
Demineralised water
Carbon dioxide
Heavy water
No moderator is used
Q.8
The nuclear energy is measured as
MeV
Curie
Farads
MW
Q.9
In a fission process, maximum percentage of energy is released as
Kinetic energy of neutrons
Kinetic energy of fission products
Instantaneous release of gamma rays
Gradual radioactive decay of fission products
Q.10
In nuclear fission
The original elements change into completely different elements
The electrons of the element change
The molecules rearrange themselves to form other molecules
None of the above
Q.11
The energy required to be applied to a radioactive nucleus for the emission of a neutron is
1 MeV
2.4 MeV
4.3 MeV
7.8 MeV
Q.12
U
235
will undergo fission by
High energy (fast) neutrons alone
Low energy (slow) neutrons alone
Either fast or slow neutrons
Medium energy neutrons
Q.13
Electron volt is the unit of
Atomic power
Energy
Voltage
Radio activity
Q.14
Which of the following can be used as a coolant in nuclear plant?
Light or heavy water
Molten lead
Carbon dioxide
Freon
Q.15
Natural uranium is made up of
99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄
99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅
99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈
Q.16
U
238
will undergo fission by
High energy (fast) neutrons alone
Low energy (slow) neutrons alone
Either fast or slow neutrons
Medium energy neutrons
Q.17
A nuclear unit becoming critical means
It is generating power to rated capacity
It is capable of generating much more than rated capacity
There is danger of nuclear spread
Chain reaction that causes automatic splitting of the fuel nuclei has been established
Q.18
Which is not identical for an atom and an isotope?
Mass number
Atomic number
Chemical properties
Position in periodic table
Q.19
The function of control rods in nuclear plants is to
Control temperature
Control radioactive pollution
Control absorption of neutron
Control fuel consumption
Q.20
Enriched uranium is one in which
Percentage of U₂₃₅ has been artificially increased
Percentage of U has been artificially increased
Percentage of U₂₃₄ has been artificially increased
Extra energy is pumped from outside
Q.21
The mass number of a substance represents the sum of total number of
Protons and neutrons in an atom
Protons and electrons in an atom
Neutrons and electrons in an atom
Protons and neutrons in a nucleus
Q.22
A boiling water reactor uses following as fuel
Enriched uranium
Plutonium
Thorium
U
Q.23
A fast breeder reactor uses following as fuel
Enriched uranium
Plutonium
Thorium
U₂₃₅
Q.24
Superheated steam is generated in following reactor
Boiling water
Gas cooled
Pressurised water
All of the above
Q.25
Which of the following nuclear reactor does not need a heat exchanger for generation of steam?
Gas cooled
Liquid metal cooled
Pressurised water
Boiling water
Q.26
Which of the following is more appropriate for a moderator? One which
Does not absorb neutrons
Absorbs neutrons
Accelerates neutrons
Eats up neutrons
Q.27
The risk of radioactive hazard is greatest in the turbine with following reactor
Pressurised water
Boiling water
Gas cooled
Liquid metal cooled
Q.28
Isotopes of same elements have
Same atomic number and different masses
Same chemical properties but different atomic numbers
Different masses and different atomic numbers
Different chemical properties and same atomic numbers
Q.29
Boiling water reactor uses the following as moderator, coolant and working fluid
Ordinary fluid
Heavy water
Molten lead
Hydrogen gas
Q.30
Which of the following are ferrite materials?
U₂₃₃ and Pu₂₃₉
U
U₂₃₈ and Pu₂₃₉
U₂₃₈ and Th₂₃₉
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