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.Management Sciences
Category: Nuclear Power Engineering
Pick out the correct statement?
0
A. Positron is the antiparticle of electron
B. In α-decay, the ratio of neutron to proton decreases
C. Ionising power of β-rays is higher than that of α-rays
D. Speed of α-rays is more than that of γ-rays
Out of the following, nucleus of _____________ atom contains the largest number of neutrons?
A. U-235
B. U-238
C. U-239
D. Pu-239
The atomic number of a radioactive element is not changed, when it emits _____________ rays?
A. α
B. β
C. γ
D. α & β
The ratio of volume of an atom to that of its nucleus is__________________?
A. 1012
B. 10-12
C. 10-8
D. 108
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?
A. 3/4th of it will disintegrate in two months
B. It will completely disintegrate in two months
C. It will completely disintegrate in four months
D. 1/8th of it will remain intact at the end of four months
“Critical mass” is the minimum mass of nuclear fissile material required for the__________________?
A. Sustainment of chain reaction
B. Power generation on commercial scale
C. Economic power generation
D. None of these
The 92U238 emits an a-particle. The product is____________________?
A. 90U234
B. 90U238
C. 90U236
D. 92U236
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