Practice Test: Question Set - 09
1. Pressure in a Pressurized Water Reactor (PWR) is used for
- (A) Maintaining constant pressure in the primary
cooling circuit under varying loads
- (B) Superheating the steam
- (C) Pressurizing the water in the primary coolant
circuit
- (D) None of these
2. The half life period of a radioactive element depends upon the
- (A) Temperature
- (B) Pressure
- (C) Amount of element present
- (D) None of these
3. The main ore of uranium is
- (A) Pitchblende
- (B) Monazite sand
- (C) Cassiterite
- (D) Chalcopyrite
4. The half life period of a radioactive element depends on its
- (A) Temperature
- (B) Pressure
- (C) Amount
- (D) None of these
5. Commercial power generation from fusion reactor is not yet possible, because
- (A) It is difficult to control fusion reaction
- (B) The fuel required (e.g. deuterium and tritium)
is scarce
- (C) It is difficult to initiate fusion reaction
- (D) Quantity of fuel required for initiating fusion
reaction is prohibitively high
6. 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
7. A fast breeder reactor
- (A) Uses natural uranium as fuel
- (B) Does not require a moderator
- (C) Both (a) and (b)
- (D) Neither (a) nor (b)
8. H2 is a better coolant than CO2, due to it’s relatively
- (A) Lower density
- (B) Higher specific heat
- (C) Non-reactivity to uranium
- (D) Lower neutron capture cross-section
9. Uranium ore is currently mined & concentrated (in India) at
- (A) Jadugoda
- (B) Ghatshila
- (C) Khetri
- (D) Alwaye
10. Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec.
- (A) 1
- (B) 2200
- (C) 3 × 1011
- (D) 9 × 1021
11. Which of the following accounts for the maximum energy release in the nuclear fission process?
- (A) Kinetic energy of fission products
- (B) Radioactive decay of fission products
- (C) Instantaneous release of γ-rays
- (D) Kinetic energy of neutrons
12. Pick out the wrong statement.
- (A) α-particle emission from a radioactive element makes it electrically
negative
- (B) β-particle emission from a radioactive element
makes it electrically positive
- (C) A radioactive element having a half life period of 20 years will
completely disintegrated in 40 years
- (D) The disintegration constant of a radioactive
isotope is independent of pressure, temperature or concentration
13. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
- (A) 159
- (B) 1837
- (C) 2537
- (D) 10000
14. __________ moderator is used in a fast breeder reactor.
- (A) Graphite
- (B) Heavy water
- (C) Beryllium
- (D) No
15. The second underground nuclear test was conducted by India at
- (A) Jaisalmer
- (B) Pokhran
- (C) Kalpakkam
- (D) Narora
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