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81.

The fuel used in nuclear reactor is

A.	graphite	B.	heavy water
C.	cadmium	D.	uranium

82.

Atoms of U-235 and U-238 differ in structure by

A.	three electrons	B.	three protons
C.	three neutrons	D.	three electrons and three protons

83.

The atom whose nucleus contains the largest number of neutrons is

A.	92U235	B.	92U238
C.	92U239	D.	94Pu239

84.

If 92U238 emits one alpha particle the remaining nucleus will contain

A.	234N + 90P	B.	236N + 88P
C.	144N + 90P	D.	145N + 93P

85.

In the final disintegration of 92U238 to 82Pb206 the number of ?-particles ejected is

A.	32	B.	10
C.	8	D.	2

86.

The fertile fuels are those

A.	which by nuclear reactions give fission fuels	B.	which can be fissioned by thermal neutrons
C.	which can be fissioned by fast neutrons	D.	which cannot be converted into fission fuels

87.

Which of the following is not a fission fuel?

A.	U-233	B.	U-235
C.	Pu-239	D.	U-238

88.

Which of the following is a fertile fuel?

A.	Th-232	B.	Pu-241
C.	U-233	D.	U-235

89.

Pitchblende is an ore of

A.	radium	B.	thorium
C.	polonium	D.	uranium

90.

Monazite sand is a chief source of

A.	uranium	B.	thorium
C.	radium	D.	polonium