Practice Test: Question Set - 16
1. Extraction of uranium from its ore is done using __________ methods.
- (A) Electrometallurgical
- (B) Pyrometallurgical
- (C) Chemical
- (D) Physical
beneficiation
2. Which of the following is a moderating material used in nuclear reactor?
- (A) Graphite
- (B) Cadmium
- (C) Zircaloy (an alloy of
zirconium and aluminium)
- (D) Stainless steel
3. Pick out the correct statement.
- (A) Positron is the
antiparticle of electron
- (B) In
α-decay, the ratio of neutron to proton decreases
- (C) Ionizing
power of β-rays is higher than that of α-rays
- (D) Speed of α-rays is
more than that of γ-rays
4. Uranium percentage in monazite sand is about
- (A) 0.01
- (B) 0.25
- (C) 1.2
- (D) 7
5. Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand, India) is
- (A) 0.1
- (B) 1
- (C) 2
- (D) 12
6. Fast breeder reactors do not
- (A) Use Th-232 as fissile
fuel
- (B) Convert fertile
material to fissile material
- (C) Use fast neutrons for
fission
- (D) Use molten sodium as
coolant
7. Pick out the correct statement.
- (A) Loss of electrons
from neutral atoms produces negative ions
- (B) The radius of nucleus
& atomic size are of the order of 10-12 cm & 10-8 cm
respectively
- (C) Gain of electrons by
neutral atoms form cations
- (D) Proton to neutron
ratio in a stable nucleus is 2 : 1
8. Fuel for a fast breeder reactor is
- (A) Plutonium
- (B) Uranium
- (C) Radium
- (D) Neptunium
9. The main ore of thorium is
- (A) Pitchblende
- (B) Monazite sand
- (C) Limonite
- (D) Galena
10. MeV is the unit of
- (A) Radioactivity
- (B) Energy
- (C) Potential
difference
- (D) None of these
11. __________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section.
- (A) Nitrogen
- (B) Hydrogen
- (C) Helium
- (D) Carbon dioxide
12. Nucleus of 92U235 contains __________ protons.
- (A) 92
- (B) 235
- (C) 143
- (D) 325
13. Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?
- (A) N2
- (B) He
- (C) CO2
- (D) H2
14. Nucleus of tritium has __________ neutrons.
- (A) 1
- (B) 2
- (C) 3
- (D) 5
15. Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.
- (A) Fuel
elements
- (B) Operating
personnels
- (C) Walls
of the reactor
- (D) None
of these
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