Chlorine
Iron
Boron
Carbon
✅ The correct answer is option D.
Chemical Engineering MCQs
75% of a radioactive element decays in 6 hours. Its half life period is __________ hours.
3-Apr
1-Jun
3
4
✅ The correct answer is option C.
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.
__________ 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.
Coolant used in a fast breeder reactor is
molten sodium
heavy water
ordinary water
helium
✅ The correct answer is option A.
Which of the following may not need a control rod ?
Liquid metal cooled reactor.
Fast breeder reactor.
Candu reactor.
None of these.
✅ The correct answer is option D.
A fast breeder reactor employs
graphite as moderator.
water as coolant.
molten sodium as coolant as well as moderator.
U-235 as fuel.
✅ The correct answer is option D.
Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is
0.1
1
3
12
✅ The correct answer is option A.
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.
The disintegration rate of a radioactive element
progressively increases.
progressively decreases.
remains constant throughout.
may increase or decrease depending on the material.
✅ The correct answer is option B.