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25.

hich of the following particles is the lightest

A.	nucleus	B.	electron
C.	proton	D.	meson

26.

ich of the following is the heaviest

A.	neutron	B.	proton
C.	atom	D.	electron

27.

n 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

28.

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

29.

e breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is

A.	same	B.	lower
C.	higher	D.	unity

30.

s cooled reactor uses following materials as moderator, and coolant

A.	graphite, C02	B.	graphite, air
C.	heavy water, C02	D.	lead, H2

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