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Quiz 5
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Q.1
Thorium⁻²32 is converted into uranium⁻²33 in a/an __________ nuclear reactor.
Thermal
Fast breeder
Heavy water moderated
Enriched uranium
Q.2
The size of an atom is of the order of one
°Angstrom
Fermi
Micron
Mm
Q.3
The decrease in the atomic number is not observed in case of
Electron capture
Β-emission
Α-emission
Positron emission
Q.4
Gas cooling as compared to water cooling of nuclear reactors
Can not attain a high temperature
Is more efficient as gas has a higher specific heat
Can produce only saturated steam for feeding to power turbine
None of these
Q.5
Percentage of heavy water in ordinary water is around
0.015
7.54
0.71
32.97
Q.6
Pressure of CO₂ gas (which is a coolant) in the Calder-Hall nuclear reactor is __________ kgf/cm² .
0.2
7
35
50
Q.7
Research reactors are normally meant for
Producing high neutron flux 10¹²-10¹³ neutrons/cm², sec and studying the effect of neutron bombardment on dif ferent materials
Accelerating the neutrons
Power generation
None of these
Q.8
The half life period of a radioactive element depends upon the
Temperature
Pressure
Amount of element present
None of these
Q.9
Which of the following is a fuel for a fusion reactor (thermonuclear reactor)?
Deuterium and tritium
U-233
Thorium
Heavy water
Q.10
The molecular weight of heavy water is
10
18
20
36
Q.11
Pressure in a Pressurised Water Reactor (PWR) is used for
Maintaining constant pressure in the primary cooling circuit under varying loads
Superheating the steam
Pressurising the water in the primary coolant circuit
None of these
Q.12
The ratio of volume of an atom to that of its nucleus is
10¹²
10⁻¹²
10⁻⁸
10⁸
Q.13
Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay)?
Power reactor
Research reactor
Fast breeder reactor
Heavy water plant
Q.14
Nuclides having the same atomic numbers are termed as
Isotopes
Isomers
Isotones
Isobars
Q.15
Isotopes of an element have the same
Number of neutrons
Mass number
Electronic configuration
Atomic weight
Q.16
Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor?
Molten sodium cooled
CO₂ gas cooled
Pressurised water
Boiling water
Q.17
A thermal nuclear reactor compared to a fast breeder reactor
Uses slower neutrons for fission
Uses faster neutrons for fission
Gives higher power density
Requires less fuel to run at the same power level
Q.18
Which of the following may be used to measure the rate of nuclear disintegration?
Geiger-Muller Counter
Cyclotron
Cold chamber
Mass spectrograph
Q.19
The critical mass of a fissionable material can be reduced by
Heating it
Cooling it
Surrounding it by neutron reflecting material
Surrounding it by neutron absorbing material
Q.20
Nuclear fuel usually used in a Boiling Water Reactor (BWR) is
Plutonium
Enriched uranium
Natural uranium
Thorium
Q.21
The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.
1100
2200
3300
4400
Q.22
Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) has
Five operating research reactors (namely Apsara, Cirus Zerelina, Purnima and Dhurva)
A 420 MW nuclear power plant
A very large capacity (100 tons/yr) heavy water plant
All of the above
Q.23
The function of moderators in nuclear reactor is to
Slow down the secondary neutrons
Absorb the secondary neutrons
Control the chain reaction
None of these
Q.24
Which of the following ores contains maximum percentage of uranium?
Carnotite
Thorium
Rescolite
Pitchblende
Q.25
Fission of U-235 on slow neutron bombardment can be represented by
92
U
235
+
0
n
1
→
56
Ba
143
+
36
Kr
90
92
U
235
+
0
n
1
→
56
Ba
143
+
36
Kr
90
+ 3
0
n
1
92
U
235
+
0
n
1
→
56
Ba
143
+
36
Kr
90
+ 3
0
n
1
+ Q (energy)
92
U
235
+
0
n
1
→
92
U
236
+ 3
0
n
1
+ Q (energy)
Q.26
Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of
High carbon steel
Molybdenum
Zircalloy
Boron or cadmium
Q.27
Which is a fertile nuclear fuel?
U-233
U-235
Pu-239
Th-232
Q.28
Which of the following is not used as a nuclear fuel cladding material?
Zircalloy
Cadmium
Ceramics
Stainless steel
Q.29
Heavy water is preferred over ordinary water as a coolant, because it.
Acts both as an efficient coolant as well as a moderator
Can be heated to a higher temperature without pressurizing
Is less prone to radiation damage
All of the above
Q.30
Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is
3
235
200
92
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