Practice Test: Question Set - 07
1. The phenomenon of nuclear fission is opposite to that of
- (A) Radioactive decay
- (B) Thermionic emission
- (C) Nuclear fusion
- (D) Combustion
2. Both tritium and deuterium have the same number of
- (A) Neutrons
- (B) Electrons
- (C) Protons
- (D) Nucleons
3. The disintegration rate of a radioactive element
- (A) Progressively increases
- (B) Progressively decreases
- (C) Remains constant throughout
- (D) May increase or decrease depending on the
material
4. A fast breeder reactor employs
- (A) Graphite as moderator
- (B) Water as coolant
- (C) Molten sodium as coolant as well as moderator
- (D) U-235 as fuel
5. The largest stable nucleus is
- (A) U-235
- (B) U-238
- (C) Pb-206
- (D) Bi-209
6. Heavy water plant is not located at (INDIA)
- (A) Talcher
- (B) Tuticorin
- (C) Ramagundam
- (D) Kota
7. In β-decay of radioactive material, the ratio of neutron to proton
- (A) Increases
- (B) Remain same
- (C) Decreases
- (D) Is unpredictable; may increase or decrease
8. Main source of __________ is monazite sand.
- (A) Uranium
- (B) Polonium
- (C) Hafnium
- (D) Thorium
9. Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.
- (A) 1
- (B) 2
- (C) 3
- (D) 7
10. Research reactors are normally meant for
- (A) Producing high neutron flux 1012-1013 neutrons/cm2,
sec and studying the effect of neutron bombardment on different materials
- (B) Accelerating the neutrons
- (C) Power generation
- (D) None of these
11. The phenomenon of radioactivity was discovered by
- (A) Madam Curie
- (B) Becquerel
- (C) Roentgen
- (D) J.J. Thomson
12. Artificially produced radioactive isotopes are used for
- (A) Power generation
- (B) Treatment of certain diseases
- (C) Initiating nuclear fission and fusion
- (D) All (a), (b) and (c)
13. First experimental observation of nuclear fission was done by
- (A) Plane
- (B) Rutherford
- (C) Fermi
- (D) Hahn and Strassmann
14. 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
15. Ordinary water is not used as a moderator because, it
- (A) Has a low absorption cross-section
- (B) Has a low scattering cross-section
- (C) Absorbs neutrons
- (D) Does not absorb neutrons
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