Practice Test: Question Set - 01
1. Fission of U-235 on slow neutron bombardment can be represented by
- (A) 92U235 +
3 γ1 → 56Ba143 + 36Kr90
- (B) 92U235 + 0n1 → 56Ba143 + 36Kr90 +
3 0n1
- (C) 92U235 + 0n1 → 56Ba143 + 36Kr90 +
3 0n1 + Q (energy)
- (D) 92U235 + 0n1 → 92U236 +
30n1+ Q (energy)
2. 'Heavy water' is termed as 'heavy' because it is
- (A) Denser
than water
- (B) An
oxide of deuterium
- (C) A
heavy liquid
- (D) An
oxide of heavier isotope of oxygen
3. Ceramic nuclear metals compared to solid nuclear metals have
- (A) Higher
melting points
- (B) Low
strength at high temperature
- (C) More
chances of radiation damage
- (D) Poorer
corrosion resistance
4. Coolant present in the primary circuit of a pressurized water reactor is high pressure
- (A) Sub
cooled water
- (B) Saturated
water
- (C) Superheated
steam
- (D) Saturated
steam
5. The time required for half of the __________ of a radioactive isotope to decay is called its half life.
- (A) Nuclei
- (B) Electrons
- (C) Protons
- (D) Neutrons
6. The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.
- (A) Electromagnetic
- (B) Reciprocating
- (C) Centrifugal
- (D) Volute
7. Which of the following is the best nuclear fuel?
- (A) Np-239
- (B) U-234
- (C) Pu-239
- (D) Th-236
8. The specific heats of three gaseous coolants namely H2, He and CO2 in the increasing order are
- (A) CO2,
He, H2
- (B) CO2,
H2, He
- (C) H2,
He, CO2
- (D) H2,
CO2, He
9. Which one is different for the neutral atoms of the isotopes of an element?
- (A) Atomic
weights
- (B) Atomic
numbers
- (C) Number
of protons
- (D) Number
of electrons
10. The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is
- (A) 1
- (B) 2
- (C) 3
- (D) 4
11. Which of the following is not a naturally occurring nuclear fuel?
- (A) Uranium-238
- (B) Thorium-233
- (C) Plutonium-239
- (D) None of
these
12. An ideal coolant for a nuclear reactor should
- (A) Be
a good absorber of neutrons
- (B) Be
capable of attaining high temperature, only when it is pressurized
- (C) Have
high density, but low heat transfer co-efficient
- (D) Be
free from radiation damage and non-corrosive
13. Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of
- (A) High carbon
steel
- (B) Molybdenum
- (C) Zircaloy
- (D) Boron
or cadmium
14. Heavy water is preferred over ordinary water as a coolant, because it.
- (A) Acts
both as an efficient coolant as well as a moderator
- (B) Can
be heated to a higher temperature without pressurizing
- (C) Is
less prone to radiation damage
- (D) All (a), (b)
and (c)
15. Percentage of U-238 in natural uranium is around
- (A) 0.71
- (B) 99.29
- (C) 0.015
- (D) 29.71