The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about . . . . . . . . metres/second.

Which of the following is not an ore of uranium?

A. Kyanite

B. Pitchblende

C. Carnotite

D. Rescolite

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