In a fission reaction average neutrons emitted are: A. 2 B. 3 C. 2.47 D. 3.47 20

A. 2 B. 3

C. 2.47 D. 3.47
20. In controlled fission reaction number of neutrons used is

A. 3 B. 2

C. 1 D. 1.5


21. Moderation in a reactor

A. absorbs thermal energy B. absorbs neutrons

C. accelerates neutrons D. slows down neutrons.
2 2. Equation 4 ₁¹H ₂⁴He + 2e⁺ + 26 M eV represents

A. fission B. β-decay

C. γ-decay D. fusion
23. Reaction in the sun is fusion reaction. In one reaction called P-P cycle how many protons combine to form a helium nuclei and two protons.

A. 4 B. 2

C. 6 D. 5
24. In reaction ₁²H+₁²H ₁³H+₁¹H+Q. what is value of Q

A . 3.3 Mev B. 4.0 Mev

C. 4.5Mev D. 3.0 Mev
25. The S.I unit of absorbed dose is

A. rad B. Gy

C. rem D. Sv
26. A man of 100 kg absorbs energy 1000J from radiations for which RBE factor is 10. The equivalent dose in rem will be.

A. 0.01 rem B. 10000 rem

C. 100 rem D. 0.1 rem