The mass of an electron is :

1. 1.6725 x 10^-27
2. 1.6725 x 10^-31
3. 1.6748 x 10^-31
4. 9.1 x 10^-31

The particle used in nuclear fission for bombardment is:

1. α particle
2. proton
3. β particle
4. neutron

In each fission reaction, the …………… remains conserved.

1. mass number
2. atomic number
3. mass
4. both (1) and (2)

Which of the following is used as moderator(s) in a nuclear reactor ?

1. Cadmium rods
2. Graphite
3. Heavy Water
4. Both (2) and (3)