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Q.1
Use of molten metal as a coolant in fast breeder reactor helps in
Rapid heat transfer from the core
Accelerating the reaction rate in the core
Breeding neutrons
Accelerating the neutrons
Q.2
Fuel for a fast breeder reactor is
Plutonium
Uranium
Radium
Neptunium
Q.3
Which of the following is the most harmful for the human being?
Β-rays
X-rays
Γ-rays
Ultra violet rays
Q.4
Coolant used in a boiling water reactor is
Hydrogen gas
Water
Steam
A mixture of water & steam
Q.5
The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element?
A+Z
A- Z
A
Z
Q.6
__________ have the same mass number, but different nuclear charge.
Isotopes
Isobars
Isotones
None of these
Q.7
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it
Is a better neutron moderator as well
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate
Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
All of the above
Q.8
Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?
N₂
He
CO₂
H₂
Q.9
When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as
Isomers
Isotopes
Isobars
Isotones
Q.10
Uranium is recovered from its ore (pitchblende) by
Froth floatation technique
Leaching with sulphuric acid
Smelting in a furnace
Dissolving in water
Q.11
The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years.
24
18
6
36
Q.12
Extraction of uranium from its ore is done by __________ method.
Chemical
Pyrometallurgical
Physical beneficiation
Electrometallurgical
Q.13
Graphite is used in nuclear reactor as
Insulation lining of the reactor
Fuel
Lubricant
Retarder of neutron velocity
Q.14
Which is the most commonly used molten metal for cooling of nuclear reactors?
Calcium
Sodium
Mercury
Zinc
Q.15
Radioactive decay is a __________ change.
Chemical
Nuclear
Physical
None of these
Q.16
Heavy water (D₂O) in a nuclear reactor serves as a
Coolant
Moderator
Both A & B
Neutron absorber
Q.17
Moderating material used in a thermal-reactor should be a
Good absorber of neutrons
Solid substance
Poor absorber of neutrons
None of these
Q.18
Which of the following is not an ore of uranium?
Pitchblende
Kyanite
Carnotite
Rescolite
Q.19
Heavy water used in the nuclear reactors to slow down the speed of neutrons is
Highly purified water
A compound of oxygen and deuterium
Water having dissolved salts of heavy metals
None of these
Q.20
The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is
Less
More
Same
Much more
Q.21
75% of a radioactive element decays in 6 hours. Its half life period is __________ hours.
3/4
1/6
3
4
Q.22
Pick out the wrong statement.
Isotopes have the same number of protons & electrons, but different number of neutrons
Hydrogen has two isotopes
In ordinary hydrogen,
1
H
1
and
1
H
2
are present in the ratio 6400:1
None of these
Q.23
The
92
U
238
emits an a-particle. The product is
90
U
234
90
U
238
90
U
236
92
U
236
Q.24
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher
Melting point, hence can be subjected to higher temperature
Density ; hence core volume for a given power output would be smaller
Resistance to effects of irradiation
All of the above
Q.25
Which of the following may not need a moderator?
Candu reactor
Fast breeder reactor
Homogeneous reactor
Pressurised water reactor
Q.26
Which one is the radioactive isotope of hydrogen?
Deuterium
Ortho-hydrogen
Tritium
None of these
Q.27
Pick out the correct statement.
Loss of electrons from neutral atoms produces negative ions
The radius of nucleus & atomic size are of the order of 10⁻¹² cm & 10⁻⁸ cm respectively
Gain of electrons by neutral atoms form cations
Proton to neutron ratio in a stable nucleus is 2 : 1
Q.28
Heavy water has maximum density at __________ °C.
4
11.6
0
18.6
Q.29
Main source of __________ is monazite sand.
Uranium
Polonium
Hafnium
Thorium
Q.30
The phenomenon of nuclear fission is opposite to that of
Radioactive decay
Thermionic emission
Nuclear fusion
Combustion
0 h : 0 m : 1 s
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