The ratio of volume of an atom to that of its nucleus is__________________?
The ratio of volume of an atom to that of its nucleus is__________________?
A. 1012
B. 10-12
C. 10-8
D. 108
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Heavy water is used as a moderator in a _____________________?
Heavy water is used as a moderator in a _____________________?A. Pressurised water reactor (PWR)
B. Boiling water reactor (BWR)
C. Candu reactor
D. Molten sodium cooled reactorThe ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is ___________________?
The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is ___________________?A. 1
B. 0.5
C. 2
D. 4Net efficiency of ordinary light water cooled nuclear reactor is about _____________ percent?
Net efficiency of ordinary light water cooled nuclear reactor is about _____________ percent?A. 32
B. 52
C. 72
D. 88The critical mass of a fissionable material can be reduced by__________________?
The critical mass of a fissionable material can be reduced by__________________?A. Heating it
B. Cooling it
C. Surrounding it by neutron reflecting material
D. Surrounding it by neutron absorbing materialModerating material used in a thermal-reactor should be a ____________________?
Moderating material used in a thermal-reactor should be a ____________________?A. Good absorber of neutrons
B. Solid substance
C. Poor absorber of neutrons
D. None of theseβ-rays emission in radioactive disintegration is always accompanied by the emission of____________________?
β-rays emission in radioactive disintegration is always accompanied by the emission of____________________?A. γ-rays
B. α-rays
C. Neutrons
D. None of these