Q.1
Which of the following is not a good moderating material?
Q.2
The mass number of an element is not changed, when it emits __________ radiations.
Q.3
Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.
Q.4
__________ moderator is used in a fast breeder reactor.
Q.5
Critical mass is the minimum mass of nuclear fissile material required for the
Q.6
An ideal coolant for a nuclear reactor should
Q.7
Which of the following isotopes is not present in natural uranium?
Q.8
Mass of a positron is same as that of a/an
Q.9
__________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.
Q.10
Which is not a fissile nuclear material?
Q.11
The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.
Q.12
A boiling water reactor is the one, in which the
Q.13
A fast breeder reactor
Q.14
Heat is generated in a nuclear reactor (thermal) by
Q.15
Fuel for a nuclear reactor (thermal) is
Q.16
A homogeneous reactor is the one, in which the
Q.17
The phenomenon of radioactivity was discovered by
Q.18
Fast breeder test reactor at Kalpakkam is designed for using
Q.19
β-rays emission in radioactive disintegration is always accompanied by the emission of
Q.20
A radioactive substance does not emit
Q.21
Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec.
Q.22
Atoms of U-238 and U-235 differ in structure by three
Q.23
Percentage of U-238 in natural uranium is around
Q.24
Candu reactor is a __________ nuclcear reactor.
Q.25
A control rod
Q.26
In a homogeneous nuclear reactor, the __________ are mixed together.
Q.27
An electron has a mass that is approximately __________ that of the proton.
Q.28
Nucleus of 92U235 contains __________ protons.
Q.29
Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.
Q.30
Primary purpose of a __________ nuclear reactor is to supply a high neutron flux of the order of 10¹³ to 10¹⁴ neutrons/cm² second.
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