81. The atomic number of a radioactive element is not changed, when it emits __________ rays.
α
β
γ
α & β
✅ The correct answer is option C.
Nuclear Power Engineering MCQs
82. __________ 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
✅ The correct answer is option A.
83. Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.
< 0.025
> 1
Jan-25
> 200.
✅ The correct answer is option A.
84. Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is
0.1
1
3
12
✅ The correct answer is option A.
86. 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
✅ The correct answer is option D.
87. Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is __________ kgf/cm2 .
0.2
7
35
50
✅ The correct answer is option B.
88. The half life period of a radioactive element depends on its
temperature
pressure
amount
none of these
✅ The correct answer is option D.
89. Nuclear power plant is not located at
Talcher (Orissa)
Rawatbhata (Rajasthan)
Kalpakkam (Tamilnadu)
Kaiga (Karnataka)
✅ The correct answer is option A.
90. Percentage of heavy water in ordinary water is around
0.015
7.54
0.71
32.97
✅ The correct answer is option A.