Practice Test: Question Set - 11
1. Which is not a fissile nuclear material?
- (A) U-233
- (B) U-235
- (C) U-238
- (D) Pu-239
2. The radioisotope used to study the thyroid gland is
- (A) Iodine
- (B) Cobalt
- (C) Iron
- (D) Carbon
3. Fast breeder reactors are most usable in India, because of our largest __________ deposits.
- (A) Thorium
- (B) Plutonium
- (C) Uranium
- (D) None of these
4. Which of the following is not used as a nuclear fuel cladding material?
- (A) Zircaloy
- (B) Cadmium
- (C) Ceramics
- (D) Stainless steel
5. An electron has a mass that is approximately __________ that of the proton.
- (A) 1836 (approximately)
- (B) 1/1836 (approximately)
- (C) 1
- (D) ∞
6. 75% of a radioactive element decays in 6 hours. Its half life period is __________ hours.
- (A) 3/4
- (B) 1/6
- (C) 3
- (D) 4
7. Which of the following reactors is operated at high neutron flux and low power level?
- (A) Breeder reactor
- (B) Research reactor
- (C) Heterogeneous reactor
- (D) Liquid metal (e.g., molten sodium) cooled reactor
8. Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for
- (A) Achieving high degree of superheat in the steam
- (B) Faster heat removal rate from the core
- (C) Lowering the coolant circulation pressure
- (D) Avoiding the mixing of water with radioactive
sodium, as it may cause explosion
9. Absorption/scattering cross-section of an element is expressed in "barn", which is equivalent to
- (A) 10-24 cm2
- (B) 10-12 cm
- (C) 1 Angstrom
- (D) 10-24 cm
10. One 'amu' is equivalent to
- (A) 9.31 MeV
- (B) 931 eV
- (C) 931 Mev
- (D) 931 J
11. Isotopes of an element have different
- (A) Mass number
- (B) Electronic configuration
- (C) Nuclear charge
- (D) Chemical properties
12. Indian monazite sand contains __________ percent thorium.
- (A) 10
- (B) 25
- (C) 60
- (D) 90
13. An element having large number of __________ is most easily subjected to nuclear fission.
- (A) Protons
- (B) Electrons
- (C) Neutrons
- (D) Nucleons
14. Thorium metal
- (A) Resembles steel in appearance
- (B) Is less hard (in the range of silver)
- (C) Is highly ductile
- (D) All (a), (b) and (c)
15. 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
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