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Quiz 8
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Q.1
The half life period of a radiactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm.
1/4
1/8
1/2
1/16
Q.2
Neutrons have mass approximately equal to that of __________ atoms.
Hydrogen
Helium
Deuterium
None of these
Q.3
A nuclear reactor can't be used for
The production of radioisotopes
Supplying intense fields or beams of neutron for scientific experiments
Marine ship propulsion
None of these
Q.4
Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.
Equal to
Less than
More than
Either more or less
Q.5
The ratio of atomic radius to its nuclear radius is about
10⁵
10⁸
10¹²
10¹⁵
Q.6
Both tritium and deuterium have the same number of
Neutrons
Electrons
Protons
Nucleons
Q.7
The second underground nuclear test was conducted by India at
Jaisalmer
Pokhran
Kalpakkan
Narora
Q.8
The first underground nuclear test was conducted by India at
Jaisalmer
Pokharan
Kalpakkam
Narora
Q.9
Solar energy results from __________ reaction.
Fission
Combustion
Thermonuclear
None of these
Q.10
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 ?-particle has mass number less by 4 units than the parent nuclide
Q.11
Coolant present in the primary circuit of a pressurised water reactor is high pressure
Sub cooled water
Saturated water
Superheated steam
Saturated steam
Q.12
The atomic number of a radioactive element is not changed, when it emits __________ rays.
α
β
γ
α & β
Q.13
Thorium can be converted into U-233 in a __________ reactor.
Liquid metal cooled
Fast breeder
Thermal
Swimming pool
Q.14
Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).
15
45
65
85
Q.15
In a nuclear explosion, the energy is released primarily in the form of __________ energy.
Potential
Thermal
Kinetic
Electrical
Q.16
The largest stable nucleus is
U-235
U-238
Pb-206
Bi-209
Q.17
Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is
0.1
1
3
12
Q.18
Unit of radioactivity is
Barn
Fermi
Angstrom
Curie
Q.19
Which of the following is the best nuclear fuel?
N
p
- 239
U-234
P
u
-239
Th-236
Q.20
The main ore of thorium is
Pitchblende
Monazite sand
Limonite
Galena
Q.21
The main ore of uranium is
Pitchblende
Monazite sand
Cassiterite
Chalcopyrite
Q.22
Fast breeder Test Reactor (FBTR) is located at
Kalpakkam (near Madras)
Kota (in Rajasthan)
BARC (Trombay)
Tarapur (in Maharashtra)
Q.23
Pick out the wrong statement.
The nucleus of a hydrogen atom is identical with a proton
A, β-ray particle is identical with an electron
Mass of an electron is about 1/1800
th
of the lightest nucleus
Positron is heavier than a proton
Q.24
Uranium percentage in monazite sand is about
0.01
0.25
1.2
7
Q.25
The number of neutrons in the nucleus of Uranium⁻²33 (
92
U
233
) is
141
92
233
325
Q.26
A fast breeder reactor employs
Graphite as moderator
Water as coolant
Molten sodium as coolant as well as moderator
U-235 as fuel
Q.27
In β-decay of radioactive material, the ratio of neutron to proton
Increases
Remains same
Decreases
Is unpredictable; may increase or decrease
Q.28
Thorium metal
Resembles steel in appearance
Is less hard (in the range of silver)
Is highly ductile
All of the above
Q.29
A radioactive isotope undergoes decay with respect to time following __________ law.
Logarithmic
Exponential
Linear
Inverse square
Q.30
Tarapur atomic power station
Has two boiling water reactors of American design
Has an installed capacity of 400 MW
Is the first power reactor in India, which became critical in 1969
All of the above
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