Practice Test: Question Set - 04
1. Isotopes of an element have the same
- (A) Number of neutrons
- (B) Mass number
- (C) Electronic configuration
- (D) Atomic weight
2. Which of the following factors is the most important in the site selection for a nuclear power plant?
- (A) Absence of earthquake prone zone in nearby areas
- (B) Abundant availability of water
- (C) Remotely located from residential areas
- (D) Proximity to fuel source
3. Use of molten metal as a coolant in fast breeder reactor helps in
- (A) Rapid heat transfer from the core
- (B) Accelerating the reaction rate in the core
- (C) Breeding neutrons
- (D) Accelerating the neutrons
4. Graphite is used in nuclear reactor as
- (A) Insulation lining of the reactor
- (B) Fuel
- (C) Lubricant
- (D) Retarder of neutron velocity
5. A nuclear reactor can't be used for
- (A) The production of radioisotopes
- (B) Supplying intense fields or beams of neutron for
scientific experiments
- (C) Marine ship propulsion
- (D) None of these
6. Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor?
- (A) Molten sodium cooled
- (B) CO2 gas cooled
- (C) Pressurized water
- (D) Boiling water
7. Pick out the wrong statement.
- (A) Isotopes have the same number of protons &
electrons, but different number of neutrons
- (B) Hydrogen has two isotopes
- (C) In ordinary hydrogen, 1H1 and 1H2 are
present in the ratio 6400:1
- (D) None of these
8. Which of the following is the most harmful for the human being?
- (A) β-rays
- (B) X-rays
- (C) γ-rays
- (D) Ultra violet rays
9. Emission of β-particles during radioactive decay of a substance is from
- (A) Innermost shell
- (B) Nucleus
- (C) Outermost shell
- (D) None of these
10. Energy equivalent to one atomic mass unit (amu) is __________ MeV.
- (A) 9.31
- (B) 93.1
- (C) 931
- (D) 9310
11. Solar energy results from __________ reaction.
- (A) Fission
- (B) Combustion
- (C) Thermonuclear
- (D) None of these
12. The critical mass of a fissionable material can be reduced by
- (A) Heating it
- (B) Cooling it
- (C) Surrounding it by neutron reflecting material
- (D) Surrounding it by neutron absorbing material
13. Heavy water used in the nuclear reactors to slow down the speed of neutrons is
- (A) Highly purified water
- (B) A compound of oxygen and deuterium
- (C) Water having dissolved salts of heavy metals
- (D) None of these
14. If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be __________ days.
- (A) 5
- (B) 10
- (C) 20
- (D) 30
15. The ratio of volume of an atom to that of its nucleus is
- (A) 1012
- (B) 10-12
- (C) 10-8
- (D) 108
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