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6 . Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor.
A. thermal
B. fast breeder
C. enriched uranium
D. heavy water moderated

7 . The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.
A. 1/2 B. 1/4
C. 1/8 D. 1/16

8 . Fast breeder reactors do not
A. use Th-232 as fissile fuel.
B. use fast neutrons for fission.
C. use molten sodium as coolant.
D. convert fertile material to fissile material.

9 . The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years.
A. 6 B. 18
C. 24 D. 48

10 . A boiling water reactor is the one, in which the
A. pressurised water is pumped into the core.
B. coolant water is allowed to boil in the core of the reactor.
C. fuel and the coolant are thoroughly mixed to form a homogeneous solution.
D. coolant water, after being heated in the reactor core, generates steam in a boiler.