The commonly used material for shielding is__________________?

A. Lead or concrete
B. Lead and tin
C. Graphite or cadmium
D. Thick galvanised sheets

The energy required to be applied to a radioactive nucleus for the emission of a neutron is________________?

A. 1 mev
B. 2.4 mev
C. 4.3 mev
D. 7.8 mev

Ferrite material is____________________?

A. The most fissionable material
B. The basic fuel for nuclear paints
C. Basic raw material for nuclear plants
D. The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

In fast breeder reactors___________________?

A. any type of moderator can be used
B. graphite is used as the moderator
C. heavy water is used as the moderator
D. moderator may or may not be used

Which of the following particles is the lightest__________________?

A. Nucleus
B. Electron
C. Proton
D. Meson

In nuclear fission each neutron that causes fission releases_______________?

A. No new neutron
B. At least one new neutron
C. One new neutron
D. More than one new neutrons

Gas cooled reactor uses following materials as moderator, and coolant____________________?

A. Graphite, c02
B. Graphite, air
C. Heavy water, c02
D. Lead, h2

A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?

A. Same
B. More
C. Less
D. There is no such criterion

The mass number of a substance represents the sum of total number of___________________?

A. Protons and neutrons in an atom
B. Protons and electrons in an atom
C. Neutrons and electrons in an atom
D. Protons and neutrons in a nucleus

The fast breeder reactor uses the following moderator__________________?

A. demineralised water
B. carbon dioxide
C. heavy water
D. graphite