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121.

Heavy water used in nuclear reactors is

A.	a product of oxygen and deuterium	B.	an ordinary water containing dissolved salts of heavy metals
C.	water of mineral springs	D.	water produced by repeated distillation and condensation

122.

Heavy water is used in nuclear reactors to

A.	cool the reactor	B.	facilitate the release of neutrons
C.	control fission	D.	slow down the speed of neutrons

123.

The molecular weight of heavy water is

A.	10	B.	12
C.	18	D.	20

124.

The substance used as neutron moderator in nuclear reactors is

A.	ordinary water	B.	heavy water
C.	liquid hydrogen	D.	liquid ammonia

125.

Maximum density of heavy water is at

A.	0?C	B.	4?C
C.	11.6?C	D.	3.8?C

126.

Heavy water is qualified as heavy because it is

A.	a heavy liquid	B.	an oxide of a heavier isotope of oxygen
C.	denser than water	D.	an oxide of deuterium

127.

The material used for absorbing neutrons in a nuclear reactor is

A.	lead	B.	uranium
C.	zinc	D.	cadmium

128.

Graphite is used in nuclear reactors

A.	as a lubricant	B.	as a fuel
C.	for lining the inside of the reactor	D.	for reducing the velocity of neutrons

129.

In slowing down neutrons in a reactor protons are most effective because

A.	the mass of a proton is almost equal to that of a neutron	B.	the proton has a change+e
C.	the proton is a constituent of all nuclei	D.	none of the above

130.

The critical mass of a fissionable material can be reduced by

A.	cooling the material	B.	heating the material
C.	surrounding it by neutron reflecting material	D.	surrounding it by neutron absorbing material