Pick out the wrong statement.
A. Atoms with the same number of nucleons but different number of protons are called isobars
B. Atoms with same number of protons but different number of nucleons are called isobars
C. Out of α, β & γ - rays, the one having maximum penetration power are y-rays
D. The product formed by emission of an α particle has mass number less by 4 units than the parent nuclide
Answer: Option B
An ideal coolant for a nuclear reactor should be
A. a good absorber of neutrons
B. capable of attaining high temperature, only when it is pressurised
C. of high density, but of low heat transfer coefficient
D. free from radiation damage & non-corrosive
Decay product of tritium which is a Beta emitter is
A. hydrogen
B. helium
C. deuterium
D. none of these
The function of moderators in nuclear reactor is to
A. slow down the secondary neutrons
B. absorb the secondary neutrons
C. control the chain reaction
D. none of these

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