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Quiz 6
Solution
Q.1.
Hydrogen differs from deuterium in __________ properties.
Radioactive
Physical
Chemical
All of the above
Q.2.
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.3.
Hydrogen has __________ isotopes.
No
One
Two
Three
Q.4.
Which is used as a coolant in nuclear reactor due to its high capture cross-section?
H₂
N₂
He
CO₂
Q.5.
Isotopes of an element have different
Mass number
Electronic configuration
Nuclear charge
Chemical properties
Q.6.
The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
159
1837
2537
10000
Q.7.
Which of the following reactors is operated at high neutron flux and low power level?
Breeder reactor
Research reactor
Heterogeneous reactor
Liquid metal (e.g., molten sodium) cooled reactor
Q.8.
Radioactive decay of a material involves a __________ order reaction.
Third
Second
First
Zero
Q.9.
A moderator __________ the neutrons.
Slows down
Absorbs
Accelerates
Reflects
Q.10.
Molten sodium is used as a coolant in a fast breeder reactor, because of its
Excellent moderating properties
Neutron breeding capability
Faster heat removal capability from the core
Capability to increase the reaction rate in the core
Q.11.
The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is
1
0.5
2
4
Q.12.
A pressurised water reactor (PWR) uses pressurised water as a
Coolant
Working fluid in power turbine
Moderator
None of these
Q.13.
Nuclear fuel complex, Hyderabad is engaged in the job of
Manufacture of nuclear fuel elements/assemblies
Processing of uranium ore
Treatment of spent fuel
None of these
Q.14.
Liquid metal (e.g, . molten sodium) is preferred as a coolant in case of a/an __________ reactor.
Homogeneous
Graphite moderated
Fast breeder
Enriched uranium (3% U-235) fuelled
Q.15.
Ordinary water is not used as a moderator because, it
Has a low absorption cross-section
Has a low scattering cross-section
Absorbs neutrons
Does not absorb neutrons
Q.16.
Pick out the wrong statement.
Atoms with same number of nucleons but different number of protons are called isobars
Atoms with same number of protons but different number of nucleons are called isoters
Out of α, β, and γ-rays, the one having maximum penetration power are γ-rays
The product formed by emission of α-particle has mass number less by 4 units than the parent nuclide
Q.17.
Net efficiency of ordinary light water cooled nuclear reactor is about __________ percent.
32
52
72
88
Q.18.
Commercial power generation from fusion reactor is not yet possible, because
It is difficult to control fusion reaction
The fuel required (e.g. deuterium and tritium) is scarce
It is difficult to initiate fusion reaction
Quantity of fuel required for initiating fusion reaction is prohibitively high
Q.19.
Fast breeder reactors are most usable in India, because of our largest __________ deposits.
Thorium
Plutonium
Uranium
None of these
Q.20.
Uranium ore is currently mined & concentrated at
Jadugoda
Ghatsila
Khetri
Alwaye
Q.21.
Which of the following is a moderating material used in nuclear reactor?
Graphite
Cadmium
Zircalloy (an alloy of zirconium and aluminium)
Stainless steel
Q.22.
In a pressurised water reactor (PWR), the
Fuel is natural uranium and heavy water acts both as moderator & coolant
Coolant water boils in the core of the reactor
Coolant water is pressurised to prevent bulk boiling of water in the core
Use of moderator is not required
Q.23.
Which of the following is not a naturally occurring nuclear fuel?
Uranium⁻²38
Thorium⁻²33
Plutonium⁻²39
None of these
Q.24.
Enriched uranium means that, it contains
More than 0.71% of U-235
Only fertile material
Only fissile material
No impurities
Q.25.
Pick out the wrong statement.
The disintegration rate of a radioactive substance can not be increased by heating it
Electrons have negligible mass and unit negative change
Deuterium atom has one proton and two neutrons in its nucleus
Cadmium is capable of absorbing neutrons
Q.26.
Which of the following nuclear materials is fissile?
Uranium⁻²38
Thorium⁻²32
Plutonium⁻²39
None of these
Q.27.
__________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section.
Nitrogen
Hydrogen
Helium
Carbon dioxide
Q.28.
What is the average life of a radioactive atom having a 'half life period' of T?
1.44 T
0.144 T
14.4 T
2T
Q.29.
The main purpose of control rod in a nuclear reactor is to control the
Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Emission of hazardous radiation
Conversion of fissile material into fertile material
Velocity of the secondary neutrons
Q.30.
Pick out the wrong statement.
The ratio of the density of the 'nucleus' to that of the 'atom' is 10¹²
Α-particle is identical with a doubly charged helium ion
The mass of deuterium atom is half that of helium atom
Gamma rays are high energy electrons
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