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Quiz 7
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Q.1
Which one is radioactive in nature?
Helium
Deuterium
Heavy hydrogen
Tritium
Q.2
Which of the following radiations is the least penetrating?
α-rays
β-rays
γ-rays
X-rays
Q.3
The decay product of tritium (a beta emitter) is
Lithium
Helium
Deuterium
Hydrogen
Q.4
Molten sodium (as a coolant in fast breeder reactor)
Can't attain high temperature at normal pressure
Is not at all corrosive, even at a higher temperature
Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
None of these
Q.5
Plutonium
Is recovered from spent fuel from thermal nuclear reactor
Has much lower melting point (640°C ) compared to thorium (1690°C)
Both A & B
Neither A nor B
Q.6
Pick out the wrong statement.
Α-particle emission from a radioactive element makes it electrically negative
Β-particle emission from a radioactive element makes it electrically positive
A radioactive element having a half life period of 20 years will completely disintegrated in 40 years
The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration
Q.7
Positron is a/an
Nucleus having two protons
Helium nucleus
Electron with positive charge
Nucleus with one proton and one neutron
Q.8
'Light water' used as a coolant in nuclear reactor is nothing but
Ordinary water
Mildly acidic (pH = 6) water
Mildly alkaline (pH = 8) water
None of these
Q.9
The specific heats of three gaseous coolants namely H₂, He and CO₂ in the increasing order are
CO₂, He, H₂
CO₂, H₂, He
H₂, He, CO₂
H₂, CO₂, He
Q.10
Which of the following is a non-fissile material?
Plutonium⁻²39
Uranium⁻²35
Uranium⁻²33
Thorium⁻²32
Q.11
In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous
Uranium oxide
Uranium hexaflouride
Uranium carbide
Uranium sulphate
Q.12
MeV is the unit of
Radioactivity
Energy
Potential difference
None of these
Q.13
Which of the following is not used as a moderator in nuclear reactor?
Molten sodium
Light water
Beryllium
Boron hydride
Q.14
Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for
Achieving high degree of superheat in the steam
Faster heat removal rate from the core
Lowering the coolant circulation pressure
Avoiding the mixing of water with radioactive sodium, as it may cause explosion
Q.15
If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same istotope will be __________ days.
5
10
20
30
Q.16
The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the
Fuel cost per unit power generated is less
Thermal efficiency of the former is higher
Maintenance cost of the former is less
None of these
Q.17
Pick out the wrong statement.
Α-particle emission from a radioactive element makes it electrically negative
Β-particle emission from a radioactive element makes it electrically positive
A radioactive element having a half life period of 20 years will completely disintegrated in 40 years
The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration
Q.18
Which of the following factors is the most important in the site selection for a nuclear power plant?
Absence of earthquake prone zone in nearby areas
Abundant availability of water
Remotely located from residential areas
Proximity to fuel source
Q.19
One 'amu' is equivalent to
9.31 MeV
931 eV
931 Mev
931J
Q.20
Which of the following types of nuclear reactors is most prone to radioactive hazards?
Pressurised water reactor
Gas cooled reactor
Molten sodium cooled reactor
Boiling water reactor
Q.21
The half life period of a radioactive element depends on its
Temperature
Pressure
Amount
None of these
Q.22
First experimental observation of nuclear fission was done by
Plane
Rutherford
Fermi
Hahn and Strassman
Q.23
Indian monazite sand contains __________ percent thorium.
10
25
60
90
Q.24
Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at
Alwaye (in Kerala)
Jadugoda (in Jharkhand)
Kalpakkam (in Tamilnadu)
Gopalpur coast (in Orissa)
Q.25
Final product of uranium extraction plant at Jadugoda (Bihar) is
Uranium
Uranium oxide
Uranium carbide
Magnesium diuranate
Q.26
Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays.
X
α and β
Neutrons & gamma
Infrared
Q.27
Nucleus of tritium has __________ neutrons.
1
2
3
5
Q.28
The new nucleus formed after β-decay of a radioactive element has
Less atomic number
Less atomic weight
More atomic number
More atomic weight
Q.29
Specific gravity of uranium and plutonium is about
9
13
19
27
Q.30
Quantity of fissionable material (i.e. U-235) in natural uranium is __________ percent.
0.71
6.31
99.29
12.73
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