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Quiz 4
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Q.1
The number of neutrons accompanying the formation of
54
Xe
139
and
38
Sr
94
from the absorption of a slow neutron by
92
U
235
, followed by nuclear fission is
1
2
3
4
Q.2
Thermal shield is used in high powered nuclear reactors to
Protect the walls of the reactor from radiation damage
Absorb the fast neutrons
Slow down the secondary neutrons
Protect the fuel element from coming in contact with the coolant
Q.3
Which of the following undergoes fission reaction easily?
U-235
U-238
Th-232
None of these
Q.4
The most commonly used nuclear fuel in boiling water reactor is
Enriched uranium
Natural uranium
Plutonium
Monazite sand
Q.5
Emission of β-particles during radioactive decay of a substance is from
Innermost shell
Nucleus
Outermost shell
None of these
Q.6
Artificially produced radioactive isotopes are used for
Power generation
Treatment of certain diseases
Initiating nuclear fission and fusion
All of the above
Q.7
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
Q.8
How many atoms are present in one gm-atom of an element?
2 x 10²³
6 x 10²³
6 x 10³²
5 x 10?
5 x 10⁵
Q.9
A heterogeneous reactor is the one, in which the moderator and the
Coolant are different materials
Coolant are present in different phases (e.g., heavy water and graphite)
Fuel are present in different phases (e.g. uranium and heavy water)
None of these
Q.10
Which one is different for the neutral atoms of the isotopes of an element?
Atomic weights
Atomic numbers
Number of protons
Number of electrons
Q.11
Which one is different for the neutral atoms of the isotopes of an element?
Atomic weights
Atomic numbers
Number of protons
Number of electrons
Q.12
Which of the following is not, a fertile material?
Th-232
U-238
U-233
None of these
Q.13
Which of the following may not need a control rod?
Liquid metal cooled reactor
Fast breeder reactor
Candu reactor
None of these
Q.14
Coolant used in a fast breeder reactor is
Molten sodium
Heavy water
Ordinary water
Helium
Q.15
Ceramic nuclear metals compared to solid nuclear metals have
Higher melting points
Low strength at high temperature
More chances of radiation damage
Poorer corrosion resistance
Q.16
Heavy water is used as a moderator in a
Pressurised water reactor (PWR)
Boiling water reactor (BWR)
Candu reactor
Molten sodium cooled reactor
Q.17
H₂ is a better coolant than CO₂, due to its relatively
Lower density
Higher specific heat
Non-reactivity to uranium
Lower neutron capture cross-section
Q.18
Out of the following, nucleus of __________ atom contains the largest number of neutrons.
U-235
U-238
U-239
Pu-239
Q.19
The atomic mass of an element is fractional, because
Of uncertainty principle
It may have isobars
It contains neutrons
It may have isotopes
Q.20
Nuclear power generation capacity in India is
3000 MW
10000 MW
More than hydroelectric power generation capacity
More than thermal power generation capacity
Q.21
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
3/4
th
of it will disintegrate in two months
It will completely disintegrate in two months
It will completely disintegrate in four months
L/8
th
of it will remain intact at the end of four months
Q.22
The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent.
3.125
6.25
12.50
25
Q.23
Energy produced in the nuclear fission is of the order of __________ MeV.
20
200
1000
2000
Q.24
Fast breeder reactors do not
Use Th-232 as fissile fuel
Convert fertile material to fissile material
Use fast neutrons for fission
Use molten sodium as coolant
Q.25
Spent fuel from the nuclear thermal reactor contains
Fission products
Plutonium
Unused fuel
All of the above
Q.26
Pick out the correct statement.
Positron is the antiparticle of electron
In α-decay, the ratio of neutron to proton decreases
Ionising power of β-rays is higher than that of α-rays
Speed of α-rays is more than that of γ-rays
Q.27
The time required for half of the __________ of a radioactive isotope to decay is called its half life.
Nuclei
Electrons
Protons
Neutrons
Q.28
Extraction of uranium from its ore is done using __________ methods.
Electrometallurgical
Pyrometallurgical
Chemical
Physical beneficiation
Q.29
A fertile material is the one, which can be
Converted into fissile material on absorption of neutron
Fissioned by slow (thermal) neutrons
Fissioned by fast neutrons
Fissioned by either slow or fast neutrons
Q.30
'Heavy water' is termed as 'heavy' because it is
Denser than water
An oxide of deuterium
A heavy liquid
An oxide of heavier isotope of oxygen
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