Mechanical Engineering MCQs – Nuclear Power Plants ( Power Plant Engineering ) MCQs
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Mechanical Engineering MCQs – Nuclear Power Plants ( Power Plant Engineering ) MCQs
The most occurred mcqs of ( ) in past papers. Past papers of Nuclear Power Plants ( Power Plant Engineering ) Mcqs. Past papers of Nuclear Power Plants ( Power Plant Engineering ) Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Nuclear Power Plants ( Power Plant Engineering ) Mcqs. The Important series of Nuclear Power Plants ( Power Plant Engineering ) Mcqs are given below:
Chemical & Nuclear Reactions – I
1. 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: d
Explanation: In a nuclear reactor, heat is generated by the fission of U-235 by neutrons.
2. 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: b
Explanation: The conversion of Thorium-232 into Uranium-233 is done in a fast breeder.
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: a
Explanation: The mass of an electron is approx. 1/1836 times that of the mass of proton.
4. 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: d
Explanation: None of the reactors mentioned above require a control rod.
5. 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: d
Explanation: The amount of a radioactive material (having a half-life of 100 years) remaining after 400 years will be 1/16 of its original weight [by using radioactive decay formula].
6. 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: b
Explanation: The amount of a radioisotope remaining un-decayed after a time equal to four times its half-life will be 6.25 percent.
7. 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: c
Explanation: As per the radioactive decay rule, the required time will be 18 years.
8. 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: d
Explanation: None of the mentioned effects are produced by Gas cooling in comparison to water cooling.
9. What is the decay product of tritium?
a) Hydrogen
b) Deuterium
c) Lithium
d) Helium
Answer: b
Explanation: Tritium decays into a Deuterium & a hydrogen atom.
Chemical & Nuclear Reactions – II
1. 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: a
Explanation: Geiger-Muller Counter is used to measure the rate of nuclear disintegration.
2. The second underground nuclear test was conducted by India at __________
a) Pokhran
b) Narora
c) Jaisalmer
d) Kalpakkam
Answer: a
Explanation: Pokhran was the place where the second underground nuclear test was conducted by India.
3. 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: b
Explanation: Fast Breeder Reactor may not need a moderator.
4. 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: d
Explanation: The mass number of an element is not changed when it emits β & γ radiations.
5. 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: c
Explanation: Plutonium-239 is an artificial nuclear fuel.
6. Which is the most commonly used molten metal for cooling of nuclear reactors?
a) Zinc
b) Sulphur
c) Sodium
d) Manganese
Answer: c
Explanation: Sodium is the most commonly used molten metal for cooling of nuclear reactors.
7. One amu is equivalent to?
a) 931 MeV
b) 93.1 eV
c) 9.31 eV
d) 931 J
Answer: a
Explanation: 91 MeV constitutes one amu.
8. 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: c
Explanation: Fast breeder reactors do not use Thorium-232 as fuel.
9. 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: d
Explanation: A boiling water reactor is the one, in which the coolant water is allowed to boil in the core of the reactor.
10. 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: c
Explanation: As fission reactions are hard to be controlled, the commercial power generation is not yet possible.
11. Which is a fertile nuclear fuel?
a) U-233
b) U-235
c) Pu-239
d) Th-232
Answer: d
Explanation: Th-232 is the only fertile nuclear fuel amongst all the mentioned nuclear fuel.
12. 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: b
Explanation: Thermal shield is used in high powered nuclear reactors to protect the walls of the reactor from radiation damage.
Nuclear Fission
1. 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: b
Explanation: The function of moderators in nuclear reactor is to slow down the secondary neutrons.
2. Which of the following is not used as a nuclear fuel cladding material?
a) Cadmium
b) Zircalloy
c) Ceramics
d) Stainless Steel
Answer: a
Explanation: Cadmium is not used as a nuclear fuel cladding material.
3. 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: b
Explanation: The Hyderabad complex is involved in the manufacturing of nuclear fuel elements.
4. 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: b
Explanation: The isotopes are atoms of the same element but with a different atomic weight.
5. 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: a
Explanation: Fast breed reactors are used to convert Thorium into U-233.
6. A moderator ______ the neutrons.
a) accelerates
b) slows down
c) blocks
d) stops
Answer: b
Explanation: The function of a moderator is to slow down fast moving neutrons thus controlling the extent of fission reaction.
7. __________ 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: b
Explanation: Boiling water nuclear reactor does not require a heat exchanger to supply steam to power turbine.
8. 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: a
Explanation: Applying Radioactive Decay law.
9. 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: b
Explanation: Thermal neutrons which are used to cause the fission of U-235 have energy < 0.025 eV.
10. 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: a
Explanation: Positron is lighter than a proton.
11. Specific gravity of uranium and plutonium is about __________
a) 13
b) 9
c) 19
d) 27
Answer: c
Explanation: Specific gravity of Uranium & Plutonium is about 19.
12. 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: c
Explanation: Boiling water reactor is the most prone to radioactive hazards.
13. 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: b
Explanation: The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about 2200 m/sec.
14. Radioactive decay is a ________ change.
a) Physical
b) Chemical
c) Nuclear
d) None of the mentioned
Answer: c
Explanation: Radioactive decay is a nuclear phenomenon.
Chain Reaction and Nuclear Reactors
1. 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: d
Explanation: Number of neutrons = Atomic weight – Atomic number.
2. 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: d
Explanation: The time required for half of the nuclei of a radioactive isotope to decay is called its half life.
3. 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: c
Explanation: Thermal nuclear reactors using enriched uranium as fuel contains a maximum of 6 percent fissile material i.e. U-235.
4. __________ moderator is used in a fast breeder reactor.
a) Heavy water
b) Graphite
c) No
d) Beryllium
Answer: c
Explanation: A fast breeder reactor doesn’t employ any moderator.
5. Nuclides having the same atomic number are termed as?
a) Isobars
b) Isotones
c) Isotopes
d) Isomers
Answer: d
Explanation: Isomers are nuclides having the same atomic number.
6. Main source of __________ is monazite sand.
a) Uranium
b) Polonium
c) Halfnium
d) Thorium
Answer: d
Explanation: Thorium is the main source of Monazite Sand.
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: a
Explanation: Emission of β-particles during radioactive decay of a substance is from the nucleus as all emissions are nuclear phenomenon.
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: a
Explanation: A fertile material is the one, which can be converted into fissile material on absorption of neutron.
9. The half-life period of a radioactive element depends on its __________
a) temperature
b) pressure
c) amount
d) none of the mentioned
Answer: d
Explanation: The half-life is independent of the mentioned factors.
10. Which is radioactive in nature?
a) Helium
b) Deuterium
c) Tritium
d) Heavy Hydrogen
Answer: c
Explanation: Tritium is a radioactive element.
11. Which is the most commonly used nuclear fuel in boiling water reactor?
a) enriched uranium
b) plutonium
c) natural uranium
d) monazite sand
Answer: a
Explanation: Enriched uranium is the most commonly used nuclear fuel in boiling water reactor.
12. 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: a
Explanation: Enrichment of uranium is done to increase the concentration of U-235 in the natural uranium.
13. Fuel for a nuclear reactor (thermal) is _____________
a) Uranium
b) Plutonium
c) Radium
d) None of the mentioned
Answer: a
Explanation: Uranium is the fuel for a thermal reactor.
14. The first underground nuclear test was conducted by India at _____________
a) Pokhran
b) Kalpakkam
c) Jaisalmer
d) Narora
Answer: a
Explanation: Pokhran had the very first underground nuclear test.
Radioactive Decay & Half Life – I
1. 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: d
Explanation: Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of 85 percent of U-235 (i.e. fissile material).
2. __________ have the same mass number, but different nuclear charge.
a) Isotones
b) Isobars
c) Isotopes
d) Isoemtropic
Answer: b
Explanation: Isobars have the same mass number, but different nuclear charge.
3. Atoms with same number of neutrons, but different number of nucleons are called __________
a) Isobars
b) Isotones
c) Isotopes
d) Isoters
Answer: b
Explanation: Atoms with same number of neutrons, but different number of nucleons are called Isotones.
4. 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: a
Explanation: 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 it will completely disintegrate in two months.
5. Which of the following ores contains maximum percentage of uranium?
a) Rescolite
b) Thorium
c) Pitchblende
d) Carnotite
Answer: c
Explanation: Pitchblende contains the maximum percentage of Uranium.
Combined Cycle Power Generation MCQs
6. Percentage of U-238 in natural uranium is around __________
a) 29.71
b) 99.29
c) 0.015
d) 0.71
Answer: c
Explanation: Natural Uranium contains around 0.015% of U-238.
7. Uranium ore is currently mined & concentrated at __________
a) Khetri
b) Alwaye
c) Ghatsilla
d) Jadugoda
Answer: d
Explanation: Uranium ore is currently mined & concentrated at Jadugoda.
8. Graphite is used in nuclear reactor as __________
a) lubricant
b) fuel
c) retarder of neutron velocity
d) insulation lining of the reactor
Answer: c
Explanation: Graphite is used in nuclear reactor as retarder of neutron velocity.
9. 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: a
Explanation: U-235 is used as a fuel in a fast breeder reactor.
10. A radioactive isotope undergoes decay with respect to time following __________ law.
a) logarithmic
b) exponential
c) inverse square
d) linear
Answer: b
Explanation: A radioactive isotope undergoes decay with respect to time following exponential law.
11. 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: b
Explanation: U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about 3 percent.
12. 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: d
Explanation: The half-life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to1/16 gm.
13. Which of the following is a non-fissile material?
a) Pu-239
b) U-235
c) U-232
d) Th-232
Answer: d
Explanation: Of the mentioned fuels, only Th-232 is the fissile nuclear fuel.
14. 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: c
Explanation: Fast breeder reactors are most usable in India, because of our largest Thorium deposits.
15. Which is the main ore of thorium?
a) Magnetite
b) Monazite Sand
c) Pitchblende
d) None of the mentioned
Answer: b
Explanation: Monazite Sand is the main ore of Thorium.
Radioactive Decay & Half Life – II
1. 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: a
Explanation: The inability of controlled fission makes it tough to enable commercial power generation.
2. First experimental observation of nuclear fission was done by __________
a) Rutherford
b) Hahn & Strassman
c) Plane
d) Fermi
Answer: d
Explanation: Fermi made the first experimental observation of nuclear fission.
3. Function of control rod in a nuclear reactor is to control __________
a) pressure
b) temperature
c) fuel consumption
d) absorption of neutrons
Answer: d
Explanation: Control rods control the absorption of neutrons.
4. “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: a
Explanation: “Critical mass” is the minimum mass of nuclear fissile material required for the sustainment of chain reaction.
5. Which of the following nuclear materials is fissile?
a) U-239
b) U-235
c) U-232
d) Pu-239
Answer: d
Explanation: Pu-239 is a fissile nuclear material.
6. Unit of Radioactivity is?
a) Curie
b) Angstrom
c) Fermi
d) Barn
Answer: a
Explanation: Curie is the unit of Radioactivity.
7. 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: d
Explanation: Number of neutrons = Atomic weight – Atomic number.
8. 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: d
Explanation: Critical energy should be more than the neutron binding energy of the atom in order to initiate a nuclear fission.
9. Which is the main ore of uranium?
a) cassiterite
b) chalcopyrite
c) pitchblende
d) monazite sand
Answer: c
Explanation: Uranium comes from its main ore Pitchblende.
10. Nucleus of tritium has how many neutrons?
a) 1
b) 2
c) 3
d) 4
Answer: b
Explanation: There are 2 neutrons in tritium.
11. Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is?
a) 2
b) 1
c) 0.1
d) 12
Answer: c
Explanation: Percentage of Uranium present in Jadugoda is 0.01%.
12. 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: c
Explanation: Coolant present in the primary circuit of a pressurised water reactor is high pressure saturated water.
13. 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: a
Explanation: Candu reactor is a natural uranium fuelled heavy water cooled & moderated nuclear reactor.
14. Extraction of uranium from its ore is done using __________ methods.
a) chemical
b) pyrometallurgical
c) electrometallurgical
d) physical benefaction
Answer: a
Explanation: Extraction of uranium from its ore is done using chemical methods.
15. Atoms of U-238 and U-235 differ in structure by three __________
a) electrons
b) protons
c) neutrons
d) electrons & three protons
Answer: c
Explanation: The two atoms differ in the structure only in the number of neutrons.
Fission Analysis – I
1. The immediate products of fission are called?
a) fission splits
b) fission fragments
c) fission products
d) fission scatters
Answer: b
Explanation: The immediate outputs of a fission reaction are called fission fragments while the same when combined with the various by-products are called fission products.
2. Each neutron produces _________ neutron(s) per fission.
a) 1
b) 2
c) 3
d) 4
Answer: c
Explanation: Per fission of one neutron, there is a release of 3 neutrons & hence, fission reactions are hard to control once started.
3. 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: a
Explanation: The unit of radioactivity, Curie is given as,
1 Curie = 3.615 x 1010 dis/s
4. The nuclear activity occurring in the radioisotope H3 is?
a) Alpha emission
b) Gamma Emission
c) Beta emission
d) None of the mentioned
Answer: c
Explanation: The nuclear activity occurring in the radioisotope H3 is Beta Emission.
5. 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: c
Explanation: The nuclear activity occurring in the radioisotope Carbon 14 is Beta Emission.
6. 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: c
Explanation: The nuclear activity occurring in the radioisotope Krypton 87 is Beta Emission.
7. 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: b
Explanation: The nuclear activity occurring in the radioisotope Xenon 135 is Gamma & Beta Emission.
8. 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: c
Explanation: The nuclear activity occurring in the radioisotope Strontium 90 is Beta Emission.
9. 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: b
Explanation: The nuclear activity occurring in the radioisotope Barium 139 is Gamma & Beta Emission.
10. 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: a
Explanation: The nuclear activity occurring in the radioisotope Radium 223 is Alpha & Gamma Emission.
Fission Analysis – II
1. The half-life of H3 radioisotope is?
a) 12.26 yr
b) 5730 yr
c) 76 min
d) 28.1 yr
Answer: a
Explanation: The Half-life of tritium radioisotope is 12.26 years.
2. Readily fissile isotopes have ___________ half-lives.
a) short
b) long
c) short & long
d) none of the mentioned
Answer: b
Explanation: As the isotopes are fissile, naturally they will have more half-life.
3. The unit superseding Curie as the unit of Radioactivity is?
a) Decibel
b) Hectare
c) Becquerel
d) None of the mentioned
Answer: c
Explanation: Becquerel signifies number of disintegrations per second, much similar to the unit Curie.
4. A series of radioactive fissions is called a _____________
a) Fission Row
b) Fission Chain
c) Fission Column
d) None of the mentioned
Answer: b
Explanation: A series of radioactive fission reactions is called a Fission Chain.
5. Beta decay is usually accompanied by?
a) alpha decay
b) beta decay
c) gamma decay
d) gamma radiation
Answer: d
Explanation: The entire beta decay process involves the release of gamma radiation apart from various factors.
6. 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: b
Explanation: Fuel burnup is the amount of energy in MW-days produced of each metric tonne of fuel.
7. The number of newly born neutrons in an uncontrolled fission reaction is?
a) 2
b) 2.5
c) 2.47
d) 2.38
Answer: c
Explanation: The number of newly born neutrons in an uncontrolled fission reaction is 2.47.
8. 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: d
Explanation: The process of losing speed of newly born neutrons on collision with other freshly produced neutrons & other obstacles in the way is called Scattering.
9. In terms of speed, the newly produced neutrons are classed into how many types?
a) 2
b) 3
c) 4
d) 5
Answer: b
Explanation: In terms of speed, the newly produced neutrons are classed in many types which are Fast, Slow & Intermediate moving neutrons.
10. 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: d
Explanation: The velocity of the newly produced fast moving neutron is 4.4 x 106 m/s.