Nuclear Power Plants Multiple Choice Questions and Answers
Nuclear Power Plants Multiple Choice Questions and Answers
Chemical & Nuclear Reactions Multiple Choice Questions and Answers
1. The time taken for a radioactive element to reduce to 50% of its original weight is __________ years if its half-life period is 12 years.
a) 24
b) 6
c) 18
d) 48
Answer: 18
2. The amount of a radioactive material (having a half-life of 100 years) remaining after 400 years will be __________ of its original weight.
a) 0.5
b) 0.25
c) 1/8
d) 1/16
Answer: 1/16
3. An electron has a mass that is approximately __________ that of the proton.
a) 1/1836
b) 1
c) 1836
d) none of the mentioned
Answer: 1/1836
4. The amount of a radioisotope remaining un-decayed after a time equal to four times its half-life will be __________ percent.
a) 3.125
b) 6.25
c) 12.50
d) 25
Answer: 6.25
5. One amu is equivalent to?
a) 931 MeV
b) 93.1 eV
c) 9.31 eV
d) 931 J
Answer: 931 MeV
6. Which is a fertile nuclear fuel?
a) U-233
b) U-235
c) Pu-239
d) Th-232
Answer: Th-232
7. Which of the following may not need a control rod?
a) Candu Reactor
b) Liquid metal cooled reactor
c) Fast breeder reactor
d) None of the mentioned
Answer: None of the mentioned
8. Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor.
a) heavy water moderated
b) fast breeder
c) thermal
d) enriched uranium
Answer: fast breeder
9. Gas cooling as compared to water cooling of nuclear reactors __________
a) cannot attain a high temperature
b) is more efficient as gas has a higher specific heat
c) can produce only saturated steam for feeding to power turbine
d) none of the mentioned
Answer: none of the mentioned
10. What is the decay product of tritium?
a) Hydrogen
b) Deuterium
c) Lithium
d) Helium
Answer: Deuterium
11. Heat is generated in a nuclear reactor (thermal) by __________
a) fusion of atoms of uranium
b) absorption of neutrons in uranium atoms
c) combustion of nuclear fuel
d) fission of U-235 by neutrons
Answer: fission of U-235 by neutrons
12. Which of the following may be used to measure the rate of nuclear disintegration?
a) Geiger-Muller Counter
b) Cold Chamber
c) Cyclotron
d) Van De Graph Generator
Answer: Geiger-Muller Counter
13. Which of the following may not need a moderator?
a) Candu Reactor
b) Fast Breeder Reactor
c) Homogeneous Reactor
d) none of the mentioned
Answer: Fast Breeder Reactor
14. The mass number of an element is not changed, when it emits __________ radiations.
a) α & γ
b) α, β, & γ
c) α & β
d) β & γ
Answer: β & γ
15. Which of the following is not a naturally occurring nuclear fuel?
a) Uranium-238
b) Thorium-233
c) Plutonium-239
d) None of the mentioned
Answer: Plutonium-239
16. Which is the most commonly used molten metal for cooling of nuclear reactors?
a) Zinc
b) Sulphur
c) Sodium
d) Manganese
Answer: Sodium
17. Thermal shield is used in high powered nuclear reactors to __________
a) absorb the fast neutrons
b) protect the walls of the reactor from radiation damage
c) slow down the secondary neutrons
d) protect the fuel element from coming in contact with the coolant
Answer: protect the walls of the reactor from radiation damage
18. A boiling water reactor is the one, in which the __________
a) pressurised water is pumped into the core.
b) coolant water, after being heated in the reactor core, generates steam in a boiler
c) fuel and the coolant are thoroughly mixed to form a homogeneous solution
d) coolant water is allowed to boil in the core of the reactor
Answer: coolant water is allowed to boil in the core of the reactor
19. Commercial power generation from fusion reactor is not yet possible, because __________
a) it is difficult to initiate fusion reaction
b) the fuel required (e.g. deuterium and tritium) is scarce
c) it is difficult to control fusion reaction
d) quantity of fuel required for initiating fusion reaction is prohibitively high
Answer: it is difficult to control fusion reaction
20. The second underground nuclear test was conducted by India at __________
a) Pokhran
b) Narora
c) Jaisalmer
d) Kalpakkam
Answer: Pokhran
21. Fast breeder reactors do not __________
a) use molten sodium as coolant
b) use fast neutrons for fission
c) use Th-232 as fissile fuel
d) convert fertile material to fissile material
Answer: use Th-232 as fissile fuel
22. Heat is generated in a nuclear reactor (thermal) by fission of U-235 by neutrons
a) True
b) False
Answer: True
23. A boiling water reactor is the one, in which the coolant water is allowed to boil in the core of the reactor
a) True
b) False
Answer: True
24. One amu is equivalent to 9.31 eV
a) True
b) False
Answer: False
25. U-235 is a fertile nuclear fuel
a) True
b) False
Answer: False
Nuclear Fission Multiple Choice Questions and Answers
1. Specific gravity of uranium and plutonium is about __________
a) 13
b) 9
c) 19
d) 27
Answer: 19
2. If 4 gm of a radioisotope has a half-life period of 10 days, the half-life of 2 gm of the same istotope will be __________ days.
a) 10
b) 5
c) 20
d) 30
Answer: 10
3. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.
a) 1100
b) 2200
c) 3300
d) 4400
Answer: 2200
4. Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.
a) >1
b) <0.025
c) >200
d) 1-25
Answer: <0.025
5. What is the function of moderators in nuclear reactor?
a) absorb the secondary neutrons
b) slow down the secondary neutrons
c) control the chain reaction
d) none of the mentioned
Answer: slow down the secondary neutrons
6. Nuclear fuel complex, Hyderabad is engaged in the job of __________
a) processing of uranium ore
b) manufacture of nuclear fuel elements/assemblies
c) treatment of spent fuel
d) none of the mentioned
Answer: manufacture of nuclear fuel elements/assemblies
7. A moderator ______ the neutrons.
a) accelerates
b) slows down
c) blocks
d) stops
Answer: slows down
8. Which one is different for the neutral atoms of the isotopes of an element?
a) Number of electrons
b) Atomic weight
c) Atomic number
d) Number of Protons
Answer: Atomic weight
9. Pick out the wrong statement.
a) Positron is heavier than a proton
b) A, β-ray particle is identical with an electron
c) The nucleus of a hydrogen atom is identical with a proton
d) Mass of an electron is about 1/1800th of the lightest nucleus
Answer: Positron is heavier than a proton
10. Thorium can be converted into U-233 in a __________ reactor.
a) fast breeder
b) liquid metal reactor
c) curtis reactor
d) none of the mentioned
Answer: fast breeder
11. Radioactive decay is a ________ change.
a) Physical
b) Chemical
c) Nuclear
d) None of the mentioned
Answer: Nuclear
12. Which of the following is not used as a nuclear fuel cladding material?
a) Cadmium
b) Zircalloy
c) Ceramics
d) Stainless Steel
Answer: Cadmium
13. Which of the following types of nuclear reactors is most prone to radioactive hazards?
a) Gas cooled reactor
b) Molten Sodium Reactor
c) Boiling water reactor
d) Pressurised water reactor
Answer: Boiling water reactor
14. __________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.
a) pressurised water
b) boiling water
c) helium cooled
d) molten sodium cooled
Answer: boiling water
15. A moderator slows down the neutrons
a) True
b) False
Answer: True
Chain Reaction and Nuclear Reactors Multiple Choice Questions and Answers
1. Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.
a) U-235
b) U-233
c) U-238
d) PU-239
Answer: U-235
2. 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) 6
Answer: 3
3. The time required for half of the __________ of a radioactive isotope to decay is called its half-life.
a) neutron
b) electron
c) proton
d) nuclei
Answer: nuclei
4. __________ moderator is used in a fast breeder reactor.
a) Heavy water
b) Graphite
c) No
d) Beryllium
Answer: No
5. Nuclides having the same atomic number are termed as?
a) Isobars
b) Isotones
c) Isotopes
d) Isomers
Answer: Isomers
6. The first underground nuclear test was conducted by India at _____________
a) Pokhran
b) Kalpakkam
c) Jaisalmer
d) Narora
Answer: Pokhran
7. Emission of β-particles during radioactive decay of a substance is from __________
a) nucleus
b) innermost shell
c) outermost shell
d) none of the mentioned
Answer: nucleus
8. A fertile material is the one, that can be __________
a) converted into fissile material on absorption of neutron
b) fissioned by either slow or fast neutrons
c) fissioned by slow (thermal) neutrons
d) fissioned by fast neutrons
Answer: converted into fissile material on absorption of neutron
9. Which is radioactive in nature?
a) Helium
b) Deuterium
c) Tritium
d) Heavy Hydrogen
Answer: Tritium
10. Which is the most commonly used nuclear fuel in boiling water reactor?
a) enriched uranium
b) plutonium
c) natural uranium
d) monazite sand
Answer: enriched uranium
11. Fuel for a nuclear reactor (thermal) is _____________
a) Uranium
b) Plutonium
c) Radium
d) None of the mentioned
Answer: Uranium
12. The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element?
a) Z
b) A
c) A+Z
d) A-Z
Answer: A-Z
13. The half-life period of a radioactive element depends on its __________
a) temperature
b) pressure
c) amount
d) none of the mentioned
Answer: none of the mentioned
14. Main source of __________ is monazite sand.
a) Uranium
b) Polonium
c) Halfnium
d) Thorium
Answer: Thorium
15. Emission of β-particles during radioactive decay of a substance is from nucleus
a) True
b) False
Answer: True
Radioactive Decay & Half Life Multiple Choice Questions and Answers
1. Which of the following is a non-fissile material?
a) Pu-239
b) U-235
c) U-232
d) Th-232
Answer: Th-232
2. Which of the following nuclear materials is fissile?
a) U-239
b) U-235
c) U-232
d) Pu-239
Answer: Pu-239
3. Percentage of U-238 in natural uranium is around __________
a) 29.71
b) 99.29
c) 0.015
d) 0.71
Answer: 0.015
4. U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent.
a) 50
b) 3
c) 85
d) 97
Answer: 3
5. Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).
a) 15
b) 45
c) 65
d) 85
Answer: 85
6. The half-life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm.
a) 1/2
b) 1/4
c) 1/8
d) 1/16
Answer: 1/16
7. Nucleus of tritium has how many neutrons?
a) 1
b) 2
c) 3
d) 4
Answer: 2
8. The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is?
a) 4
b) 3
c) 2
d) 1
Answer: 1
9. Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is?
a) 2
b) 1
c) 0.1
d) 12
Answer: 0.1
10. Atoms with same number of neutrons, but different number of nucleons are called __________
a) Isobars
b) Isotones
c) Isotopes
d) Isoters
Answer: Isotones
11. A radioactive isotope undergoes decay with respect to time following __________ law.
a) logarithmic
b) exponential
c) inverse square
d) linear
Answer: exponential
12. Which of the following ores contains maximum percentage of uranium?
a) Rescolite
b) Thorium
c) Pitchblende
d) Carnotite
Answer: Pitchblende
13. Fast breeder reactors are most usable in India, because of our largest __________ deposits.
a) Uranium
b) Plutonium
c) Thorium
d) None of the mentioned
Answer: Thorium
14. __________ have the same mass number, but different nuclear charge.
a) Isotones
b) Isobars
c) Isotopes
d) Isoemtropic
Answer: Isobars
15. Uranium ore is currently mined & concentrated at __________
a) Khetri
b) Alwaye
c) Ghatsilla
d) Jadugoda
Answer: Jadugoda
16. A fast breeder reactor employs __________
a) U-235 as a fuel
b) water as a coolant
c) graphite as a moderator
d) none of the mentioned
Answer: U-235 as a fuel
17. The half-life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half-life period of a radioactive substance is one month, then?
a) it will completely disintegrate in two months
b) l/8th of it will remain intact at the end of four months
c) 3/4th of it will disintegrate in two months
d) it will completely disintegrate in four months
Answer: it will completely disintegrate in two months
18. Candu reactor is a __________ nuclear reactor.
a) natural uranium fuelled heavy water cooled & moderated
b) highly enriched uranium (85% U-235) fuelled
c) homogeneous
d) fast breeder
Answer: natural uranium fuelled heavy water cooled & moderated
19. Which is the main ore of thorium?
a) Magnetite
b) Monazite Sand
c) Pitchblende
d) None of the mentioned
Answer: Monazite Sand
20. Which is the main ore of uranium?
a) cassiterite
b) chalcopyrite
c) pitchblende
d) monazite sand
Answer: pitchblende
21. Graphite is used in nuclear reactor as __________
a) lubricant
b) fuel
c) retarder of neutron velocity
d) insulation lining of the reactor
Answer: retarder of neutron velocity
22. First experimental observation of nuclear fission was done by __________
a) Rutherford
b) Hahn & Strassman
c) Plane
d) Fermi
Answer: Fermi
23. “Critical mass” is the minimum mass of nuclear fissile material required for the __________
a) sustainment of chain reaction
b) economic power generation
c) power generation on commercial scale
d) none of the mentioned
Answer: sustainment of chain reaction
24. Unit of Radioactivity is?
a) Curie
b) Angstrom
c) Fermi
d) Barn
Answer: Curie
25. Commercial power generation from fusion reactor is not yet possible, because __________
a) it is hard to control fission
b) it is hard to initiate fission
c) it is a non-periodic process
d) none of the mentioned
Answer: it is hard to control fission
26. Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.
a) less than
b) equal to
c) either more or less
d) more than
Answer: more than
27. Atoms of U-238 and U-235 differ in structure by three __________
a) electrons
b) protons
c) neutrons
d) electrons & three protons
Answer: neutrons
28. Extraction of uranium from its ore is done using __________ methods.
a) chemical
b) pyrometallurgical
c) electrometallurgical
d) physical benefaction
Answer: chemical
29. Coolant present in the primary circuit of a pressurised water reactor is high pressure __________
a) saturated steam
b) superheated steam
c) saturated water
d) sub cooled water
Answer: saturated water
30. Function of control rod in a nuclear reactor is to control __________
a) pressure
b) temperature
c) fuel consumption
d) absorption of neutrons
Answer: absorption of neutrons
Fission Analysis Multiple Choice Questions and Answers
1. The number of newly born neutrons in an uncontrolled fission reaction is?
a) 2
b) 2.5
c) 2.47
d) 2.38
Answer: 2.38
2. In terms of speed, the newly produced neutrons are classed into how many types?
a) 2
b) 3
c) 4
d) 5
Answer: 3
3. Each neutron produces _________ neutron(s) per fission.
a) 1
b) 2
c) 3
d) 4
Answer: 3
4. The half-life of H3 radioisotope is?
a) 12.26 yr
b) 5730 yr
c) 76 min
d) 28.1 yr
Answer: 12.26 yr
5. The velocity of a fast moving neutron is?
a) 2 m/s
b) 2.4 x 1010 m/s
c) 4.4 x 1010 m/s
d) 4.4 x 106 m/s
Answer: 4.4 x 106 m/s
6. 1 Curie = _____________
a) 3.615 x 1010 dis/s
b) 3.615 x 100.7 dis.s
c) 3.615 x 1012 dis
d) 3.615 x 10 dis/s
Answer: 3.615 x 1010 dis/s
7. The nuclear activity occurring in the radioisotope H3 is?
a) Alpha emission
b) Gamma Emission
c) Beta emission
d) None of the mentioned
Answer: Beta emission
8. The immediate products of fission are called?
a) fission splits
b) fission fragments
c) fission products
d) fission scatters
Answer: fission fragments
9. The nuclear activity occurring in the radioisotope Krypton 87 is?
a) Alpha emission
b) Gamma Emission
c) Beta emission
d) None of the mentioned
Answer: Beta emission
10. The nuclear activity occurring in the radioisotope Carbon 14 is?
a) Alpha emission
b) Gamma Emission
c) Beta emission
d) None of the mentioned
Answer: Beta emission
11. The nuclear activity occurring in the radioisotope Barium 139 is?
a) Alpha & Beta emission
b) Gamma & Beta Emission
c) Beta emission
d) None of the mentioned
Answer: Gamma & Beta Emission
12. The unit superseding Curie as the unit of Radioactivity is?
a) Decibel
b) Hectare
c) Becquerel
d) None of the mentioned
Answer: Becquerel
13. The nuclear activity occurring in the radioisotope Strontium 90 is?
a) Alpha emission
b) Gamma Emission
c) Beta emission
d) None of the mentioned
Answer: Beta emission
14. The nuclear activity occurring in the radioisotope Radium 223 is?
a) Alpha & Gamma emission
b) Gamma & Beta Emission
c) Beta emission
d) None of the mentioned
Answer: Alpha & Gamma emission
15. The nuclear activity occurring in the radioisotope Xenon 135 is?
a) Alpha & Beta emission
b) Gamma & Beta Emission
c) Beta emission
d) None of the mentioned
Answer: None of the mentioned
16. Readily fissile isotopes have ___________ half-lives.
a) short
b) long
c) short & long
d) none of the mentioned
Answer: long
17. A series of radioactive fissions is called a _____________
a) Fission Row
b) Fission Chain
c) Fission Column
d) None of the mentioned
Answer: Fission Chain
18. Beta decay is usually accompanied by?
a) alpha decay
b) beta decay
c) gamma decay
d) gamma radiation
Answer: gamma radiation
19. The process of losing speed of newly born neutrons on collision with other freshly produced neutrons & other obstacles in the way is called?
a) Dispersion
b) Diversion
c) Deviation
d) Scattering
Answer: Scattering
20. The amount of energy in MW-days produced of each metric tonne of fuel is?
a) fuel ignition
b) fuel burnup
c) fuel Chain
d) fuel Column
Answer: fuel burnup
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