The phenomenon of nuclear fission is opposite to that of__________________?

A. Progressively increases
B. Progressively decreases
C. Remains constant throughout
D. May increase or decrease depending on the material

A. Less
B. More
C. Same
D. Much more

A. β-rays
B. X-rays
C. γ-rays
D. Ultra violet rays

A. 1/4
B. 1/8
C. 1/2
D. 1/16

A. Protect the walls of the reactor from radiation damage
B. Absorb the fast neutrons
C. Slow down the secondary neutrons
D. Protect the fuel element from coming in contact with the coolant

A. Fission products
B. Plutonium
C. Unused fuel
D. All A., B. & C.