Question 71 : Gas cooling as compared to water cooling of nuclear reactors
1. is more efficient as gas has a higher specific heat.
2. can not attain a high temperature.
3. none of these.
4. can produce only saturated steam for feeding to power turbine.
View Answer   Discuss with Members

Question 72 : The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.
1. 1/4
2. 1/2
3. 1/16
4. 1/8
View Answer   Discuss with Members

Question 73 : Fast breeder reactors do not
1. use molten sodium as coolant.
2. use Th-232 as fissile fuel.
3. convert fertile material to fissile material.
4. use fast neutrons for fission.
View Answer   Discuss with Members

Question 74 : Which is the most commonly used molten metal for cooling of nuclear reactors ?
1. Zinc
2. Mercury
3. Calcium
4. Sodium
View Answer   Discuss with Members

Question 75 : An electron has a mass that is approximately __________ that of the proton.
1. 1
2. 1836 (approximately)
3. 1/1836 (approximately)
4. ∞
View Answer   Discuss with Members

Question 76 : Which of the following is not a naturally occurring nuclear fuel ?
1. Plutonium-239
2. None of these
3. Thorium-233
4. Uranium-238
View Answer   Discuss with Members

Question 77 : Which of the following may be used to measure the rate of nuclear disintegration?
1. Cold chamber
2. Geiger-Muller Counter
3. Cyclotron
4. Mass spectrograph
View Answer   Discuss with Members

Question 78 : The decrease in the atomic number is not observed in case of
1. β-emission
2. α-emission
3. electron capture
4. positron emission
View Answer   Discuss with Members

Question 79 : The mass number of an element is not changed, when it emits __________ radiations.
1. γ & α
2. β & γ
3. α, β, & γ
4. α & β
View Answer   Discuss with Members