Practice Test: Question Set - 06
1. 'Light water' used as a coolant in nuclear reactor is nothing but
- (A) Ordinary water
- (B) Mildly acidic (pH = 6) water
- (C) Mildly alkaline (pH = 8) water
- (D) None of these
2. Which of the following undergoes fission reaction easily?
- (A) U-235
- (B) U-238
- (C) Th-232
- (D) None of these
3. A radioactive isotope undergoes decay with respect to time following __________ law.
- (A) Logarithmic
- (B) Exponential
- (C) Linear
- (D) Inverse square
4. The function of moderators in nuclear reactor is to
- (A) Slow down the secondary neutrons
- (B) Absorb the secondary neutrons
- (C) Control the chain reaction
- (D) None of these
5. The decay product of tritium (a beta emitter) is
- (A) Lithium
- (B) Helium
- (C) Deuterium
- (D) Hydrogen
6. The molecular weight of heavy water is
- (A) 10
- (B) 18
- (C) 20
- (D) 36
7. Enriched uranium means that, it contains
- (A) More than 0.71% of U-235
- (B) Only fertile material
- (C) Only fissile material
- (D) No impurities
8. In the nuclear reaction, 93N239→ 94Pu239 + ?; the missing particle is a/an
- (A) Electron
- (B) Proton
- (C) Neutron
- (D) Positron
9. Which is a fertile nuclear fuel?
- (A) U-233
- (B) U-235
- (C) Pu-239
- (D) Th-232
10. Spent fuel from the nuclear thermal reactor contains
- (A) Fission products
- (B) Plutonium
- (C) Unused fuel
- (D) All (a), (b) & (c)
11. Heavy water is used as a moderator in a
- (A) Pressurized water reactor (PWR)
- (B) Boiling water reactor (BWR)
- (C) Candu reactor
- (D) Molten sodium cooled reactor
12. Heavy water has maximum density at __________ °C.
- (A) 4
- (B) 11.6
- (C) 0
- (D) 18.6
13. Candu reactor is a __________ nuclear reactor.
- (A) Natural uranium fuelled heavy water cooled &
moderated
- (B) Highly enriched uranium (85% U-235) fuelled
- (C) Homogeneous
- (D) Fast breeder
14. The most commonly used nuclear fuel in boiling water reactor is
- (A) Enriched uranium
- (B) Natural uranium
- (C) Plutonium
- (D) Monazite sand
15. Which one is the radioactive isotope of hydrogen?
- (A) Deuterium
- (B) Ortho-hydrogen
- (C) Tritium
- (D) None of these
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