Nuclear Engineering Question:
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Which is the most commonly used molten metal for cooling of nuclear reactors ?

A. Calcium
B. Sodium
C. Mercury
D. Zinc

Answer:

Option B

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An electron has a mass that is approximately __________ that of the proton.

A. 1836 (approximately)
B. 1/1836 (approximately)
C. 1
D. ∞?
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