Nuclear Engineering Interview Questions And Answers Guide. · Nuclear Engineering Interview Questions And Answers Global Guideline . COM Gas cooling as compared to water cooling of

Nuclear Engineering InterviewQuestions And Answers Guide.

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Nuclear Engineering Interview Questions And Answers

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Nuclear Engineering Job Interview Preparation Guide.

Question # 1Do you know what is Nuclear Engineering?

Answer:-Nuclear engineering is the branch of engineering concerned with the application of the breakdown (fission) as well as the fusion of atomic nuclei and/or theapplication of other sub-atomic physics, based on the principles of nuclear physics.Read More Answers.

Question # 2Do you know what does a nuclear engineer do?

Answer:-Developing nuclear equipment, such as reactor cores and radiation shieldingMonitoring nuclear plant design, construction and operations to ensure that the plants meet safety standardsWriting instructions for the handling and disposal of nuclear wasteTesting whether methods of using nuclear material, reclaiming nuclear fuel or disposing of nuclear waste are acceptableTaking corrective action or ordering plant shutdowns in emergenciesExamining nuclear accidents and gathering data that can be used to prevent future accidentsRead More Answers.

Question # 3What is the history of Nuclear Engineering?

Answer:-Nuclear engineering was born in the 20th century with the announcement in 1939 of the discovery of nuclear fission by the German chemists.Read More Answers.

Question # 4Which of the following may be used to measure the rate of nuclear disintegration?A. Geiger-Muller CounterB. CyclotronC. Cold chamberD. Mass spectrograph?

Answer:-Option ARead More Answers.

Question # 5The decrease in the atomic number is not observed in case ofA. electron captureB. ?-emissionC. ?-emissionD. positron emission?

Answer:-Option BRead More Answers.

Question # 6The mass number of an element is not changed, when it emits __________ radiations.A. a & ßB. ß & Y

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C. Y & aD. a, ß, & Y


Question # 7Which of the following is not a naturally occurring nuclear fuelA. Uranium-238B. Thorium-233C. Plutonium-239D. None of these

Answer:-Option CRead More Answers.

Question # 8An electron has a mass that is approximately __________ that of the proton.A. 1836 (approximately)B. 1/1836 (approximately)C. 1D. âˆž?


Question # 9Which is the most commonly used molten metal for cooling of nuclear reactors ?A. CalciumB. SodiumC. MercuryD. Zinc


Question # 10The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.A. 1/2B. 1/4C. 1/8D. 1/16

Answer:-Option DRead More Answers.

Question # 11The second underground nuclear test was conducted by India atA. JaisalmerB. PokhranC. KalpakkanD. Narora


Question # 12Which of the following is artificially produced as it does not occur in nature ?A. Uranium-235B. Uranium-233C. Plutonium-239D. Both (b) and (c)


Question # 13




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Gas cooling as compared to water cooling of nuclear reactorsA. can not 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 these.


Question # 14The decay product of tritium (a beta emitter) isA. lithiumB. heliumC. deuteriumD. hydrogen?


Question # 15Heat is generated in a nuclear reactor (thermal) byA. combustion of a nuclear fuel e.g. uranium.B. fusion of atoms of uranium.C. absorption of neutrons in uranium atoms.D. fission of U-235 by neutrons.?


Question # 16The 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. 24B. 18C. 6D. 36


Question # 17Which of the following may not need a moderator?A. Candu reactorB. Fast breeder reactorC. Homogeneous reactorD. Pressurised water reactor


Question # 18The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent.A. 3.125B. 6.25C. 12.50D. 25


Question # 19Commercial power generation from fusion reactor is not yet possible, becauseA. 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.

Answer:-Option A




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Question # 20One 'amu' is equivalent toA. 9.31 MeVB. 931 eVC. 931 MevD. 931J


Question # 21Fast breeder reactors do notA. use Th-232 as fissile fuel.B. convert fertile material to fissile material.C. use fast neutrons for fission.D. use molten sodium as coolant.


Question # 22Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor.A. thermalB. fast breederC. heavy water moderatedD. enriched uranium


Question # 23Which of the following may not need a control rod ?A. Liquid metal cooled reactor.B. Fast breeder reactor.C. Candu reactor.D. None of these.


Question # 24Spent fuel from the nuclear thermal reactor containsA. fission productsB. plutoniumC. unused fuelD. all (a), (b) & (c)


Question # 25A boiling water reactor is the one, in which theA. coolant water is allowed to boil in the core of the reactor.B. coolant water, after being heated in the reactor core, generates steam in a boiler.C. pressurised water is pumped into the core.D. fuel and the coolant are thoroughly mixed to form a homogeneous solution.


Question # 26Which is used as a coolant in nuclear reactor due to its high capture cross-section ?A. H2B. N2C. He




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D. CO2


Question # 27Moderating material used in a thermal-reactor should be aA. good absorber of neutrons.B. solid substance.C. poor absorber of neutrons.D. none of these.


Question # 28Ordinary water is not used as a moderator because, itA. has a low absorption cross-section.B. has a low scattering cross-section.C. absorbs neutrons.D. does not absorb neutrons.


Question # 29The atomic number of a radioactive element is not changed, when it emits __________ rays.A. aB. ßC. YD. a & ß


Question # 30Fission of U-235 on slow neutron bombardment can be represented byA. 92U235 + 3 Y1 56Ba143 + 36Kr90B. 92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1C. 92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1 + Q (energy)D. 92U235 + 0n1 92U236 + 30n1+ Q (energy)


Question # 31A nuclear reactor can't be used forA. the production of radioisotopes.B. supplying intense fields or beams of neutron for scientific experiments.C. marine ship propulsion.D. none of these.


Question # 32Which of the following is a moderating material used in nuclear reactor ?A. Graphite.B. Cadmium.C. Zircalloy (an alloy of zirconium and aluminium).D. Stainless steel.


Question # 33




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The atomic number of an element is equal to the number of __________ present in its atom.A. neutronsB. electronsC. protonsD. either (b) or (c)


Question # 34Which of the following is not, a fertile material?A. Th-232B. U-238C. U-233D. none of these


Question # 35Molten sodium (as a coolant in fast breeder reactor)A. can't attain high temperature at normal pressure.B. is not at all corrosive, even at a higher temperature.C. is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water.D. none of these


Question # 36Final product of uranium extraction plant at Jadugoda (Bihar) isA. uraniumB. uranium oxideC. uranium carbideD. magnesium diuranate


Question # 37Which one is the radioactive isotope of hydrogen?A. DeuteriumB. Ortho-hydrogenC. TritiumD. None of these


Question # 38A homogeneous reactor is the one, in which theA. fissile atoms are evenly distributed throughout the mass of nuclear reactor.B. same substance (e.g. heavy water) is used as moderator & coolant.C. the fuel and the moderator is mixed to form a homogeneous material.D. all (a), (b) and (c).


Question # 39Hydrogen has __________ isotopes.A. noB. oneC. twoD. three

Answer:-Option D




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Question # 40MeV is the unit ofA. radioactivityB. energyC. potential differenceD. none of these


Question # 41Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec.A. 1B. 2200C. 3 x 1011D. 9 x 1021


Question # 42Energy equivlant to one atomic mass unit (amu) is __________ MeV.A. 9.31B. 93.1C. 931D. 9310


Question # 43"Critical mass" is the minimum mass of nuclear fissile material required for theA. sustainment of chain reaction.B. power generation on commercial scale.C. economic power generation.D. none of these.


Question # 44The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.A. electromagneticB. reciprocatingC. centrifugalD. volute


Question # 45Fast breeder Test Reactor (FBTR) is located atA. Kalpakkam (near Madras).B. Kota (in Rajasthan).C. BARC (Trombay).D. Tarapur (in Maharashtra).


Question # 46Tarapur atomic power stationA. has two boiling water reactors of American design.B. has an installed capacity of 400 MW.C. is the first power reactor in India, which became critical in 1969.




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D. all (a), (b) and (c).


Question # 47In a nuclear explosion, the energy is released primarily in the form of __________ energy-A. potentialB. thermalC. kineticD. electrical


Question # 48The largest stable nucleus isA. U-235B. U-238C. Pb-206D. Bi-209


Question # 49Hydrogen bomb employs the nuclear fusion ofA. hydrogenB. deuteriumC. tritiumD. helium


Question # 50Sodium melts (at atmospheric pressure) at a temperature of __________ .C.A. 58B. 98C. 348D. 588


Question # 51The ratio of volume of an atom to that of its nucleus isA. 1012B. 10-12C. 10-8D. 108


Question # 52Research reactors are normally meant forA. producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron bombardment on dif ferent materials.B. accelerating the neutrons.C. power generation.D. none of these


Question # 53




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Out of the following places, a nuclear power plant is not located atA. Talcher (Orissa)B. Kaiga (Karnataka)C. Rawatbhata (Rajsthan)D. Kalpakkam (Tamilnadu)


Question # 54Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.A. < 0.025B. > 1C. 1-25D. > 200.


Question # 55Which of the following types of nuclear reactors is most prone to radioactive hazards?A. Pressurised water reactorB. Gas cooled reactorC. Molten sodium cooled reactorD. Boiling water reactor


Question # 56Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.A. 1B. 2C. 3D. 7


Question # 57The 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. A+ZB. A- ZC. AD. Z


Question # 58Which of the following is not used as a nuclear fuel cladding material?A. ZircalloyB. CadmiumC. CeramicsD. Stainless steel


Question # 59The function of moderators in nuclear reactor is toA. slow down the secondary neutrons.B. absorb the secondary neutrons.C. control the chain reaction.D. none of these.

Answer:-Option A




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Question # 60Specific gravity of uranium and plutonium is aboutA. 9B. 13C. 19D. 27


Question # 61Pick out the wrong statement.A. The nucleus of a hydrogen atom is identical with a proton.B. A, ß-ray particle is identical with an electron.C. Mass of an electron is about 1/1800th of the lightest nucleus.D. Positron is heavier than a proton.


Question # 62If 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. 5B. 10C. 20D. 30


Question # 63__________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.A. Molten sodium cooledB. Helium cooledC. Boiling waterD. Pressurised water


Question # 64Radioactive decay is a __________ change.A. chemicalB. nuclearC. physicalD. none of these


Question # 65Nuclear fuel complex, Hyderabad is engaged in the job ofA. manufacture of nuclear fuel elements/assemblies .B. processing of uranium ore.C. treatment of spent fuel.D. none of these.


Question # 66A moderator __________ the neutrons.A. slows downB. absorbsC. accelerates




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D. reflects


Question # 67Thorium can be converted into U-233 in a __________ reactor.A. liquid metal cooledB. fast breederC. thermalD. swimming pool


Question # 68Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higherA. melting point, hence can be subjected to higher temperature.B. density ; hence core volume for a given power output would be smaller.C. resistance to effects of irradiation.D. all (a), (b) and (c).


Question # 69Which is a fertile nuclear fuel?A. U-233B. U-235C. Pu-239D. Th-232


Question # 70The time required for half of the __________ of a radioactive isotope to decay is called its half life.A. nucleiB. electronsC. protonsD. neutrons


Question # 71The ratio of atomic radius to its nuclear radius is aboutA. 105B. 108C. 1012D. 1015


Question # 72Which one is different for the neutral atoms of the isotopes of an element?A. Atomic weightsB. Atomic numbersC. Number of protonsD. Number of electrons


Question # 73




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_________ moderator is used in a fast breeder reactor.A. GraphiteB. Heavy waterC. BerylliumD. No


Question # 74The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.A. 1100B. 2200C. 3300D. 4400


Question # 75Thermal shield is used in high powered nuclear reactors toA. protect the walls of the reactor from radiation damage.B. absorb the fast neutrons.C. slow down the secondary neutrons.D. protect the fuel element from coming in contact with the coolant.


Question # 76The 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 itsknown quantity. If the half life period of a radioactive substance is one month, thenA. 3/4th of it will disintegrate in two months.B. it will completely disintegrate in two months.C. it will completely disintegrate in four months.D. l/8th of it will remain intact at the end of four months.


Question # 77Graphite is used in nuclear reactor asA. insulation lining of the reactor.B. fuel.C. lubricant.D. retarder of neutron velocity.


Question # 78The half life period of a radioactive element depends on itsA. temperatureB. pressureC. amountD. none of these


Question # 79__________ have the same mass number, but different nuclear charge.A. IsotopesB. IsobarsC. IsotonesD. none of these

Answer:-Option B




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Question # 80Which one is radioactive in nature?A. HeliumB. DeuteriumC. Heavy hydrogenD. Tritium


Question # 81The most commonly used nuclear fuel in boiling water reactor isA. enriched uraniumB. natural uraniumC. plutoniumD. monazite sand


Question # 82Nuclides having the same atomic numbers are termed asA. isotopesB. isomersC. isotonesD. isobars


Question # 83A fertile material is the one, which can beA. converted into fissile material on absorption of neutron.B. fissioned by slow (thermal) neutrons.C. fissioned by fast neutrons.D. fissioned by either slow or fast neutrons.


Question # 84Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).A. 15B. 45C. 65D. 85


Question # 85Thorium metalA. resembles steel in appearance.B. is less hard (in the range of silver).C. is highly ductile.D. all (a), (b) and (c).


Question # 86Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.A. U-238B. U-233C. U-235




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D. Pu-239


Question # 87Atoms with same number of neutrons, but different number of nucleons are calledA. isotonesB. isobarsC. isotopesD. isoters


Question # 88Which of the following ores contains maximum percentage of uranium?A. CarnotiteB. Thorium.C. RescoliteD. Pitchblende


Question # 89Uranium ore is currently mined & concentrated atA. JadugodaB. GhatsilaC. KhetriD. Alwaye


Question # 90How many atoms are present in one gm-atom of an element?A. 2 x 10 23B. 6 x 10 23C. 6 x 10 32D. 5 x 10 5


Question # 91Emission of ß-particles during radioactive decay of a substance is fromA. innermost shellB. nucleusC. outermost shellD. none of these


Question # 92Percentage of U-238 in natural uranium is aroundA. 0.71B. 99.29C. 0.015D. 29.71


Question # 93




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Fuel for a nuclear reactor (thermal) isA. uraniumB. plutoniumC. radiumD. none of these


Question # 94A fast breeder reactor employsA. graphite as moderator.B. water as coolant.C. molten sodium as coolant as well as moderator.D. U-235 as fuel.


Question # 95PlutoniumA. is recovered from spent fuel from thermal nuclear reactor.B. has much lower melting point (640.C ) compared to thorium (1690.C).C. both (a) and (b).D. neither (a) nor (b).


Question # 96A control rodA. should have small absorption cross-section.B. is generally made of boron, hafnium or cadmium.C. should have large absorption cross-section.D. both (b) and (c).


Question # 97Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment isA. 3B. 235C. 200D. 92


Question # 98Fuel for a fast breeder reactor isA. plutoniumB. uraniumC. radiumD. neptunium


Question # 99Fast breeder test reactor at Kalpakkam is designed for usingA. thorium as a fertile material.B. U-238 as a fertile material.C. helium as a coolant.D. uranium ore directly as a fuel.

Answer:-Option A




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Question # 100In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseousA. uranium oxideB. uranium hexaflourideC. uranium carbideD. uranium sulphate


Question # 101The mass number of an element is equal to the number of __________ in the nucleus.A. electronsB. neutronsC. protonsD. neutrons plus protons (i.e., nucleons)


Question # 102Mass of a positron is same as that of a/anA. electronB. a-particleC. protonD. neutron


Question # 103Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.A. fuel elementsB. operating personnelsC. walls of the reactorD. none of these


Question # 104Isotopes of an element have differentA. mass numberB. electronic configurationC. nuclear chargeD. chemical properties


Question # 105Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays.A. XB. a and ßC. neutrons & gammaD. infrared


Question # 106Radioactive decay of a material involves a __________ order reaction.A. thirdB. secondC. first




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D. zero


Question # 107Which 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.


Question # 108A fast breeder reactorA. uses natural uranium as fuel.B. does not require a moderator.C. both (a) and (b).D. neither (a) nor (b).


Question # 109Heavy water has maximum density at __________ .C.A. 4B. 11.6C. 0D. 18.6


Question # 110Ceramic nuclear metals compared to solid nuclear metals haveA. higher melting points.B. low strength at high temperature.C. more chances of radiation damage.D. poorer corrosion resistance.


Question # 111Uranium ore is mined & concentrated in India atA. Jadugoda(Jharkhand)B. Kota (Rajasthan)C. Tuticorin (Tamilnadu)D. Talchar (Orissa)


Question # 112Which of the following reactors is operated at high neutron flux and low power level?A. Breeder reactor.B. Research reactor.C. Heterogeneous reactor.D. Liquid metal (e.g., molten sodium) cooled reactor.


Question # 113




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Uranium percentage in monazite sand is aboutA. 0.01B. 0.25C. 1.2D. 7


Question # 114Artificially produced radioactive isotopes are used forA. power generation.B. treatment of certain diseases.C. initiating nuclear fission and fusion.D. all (a), (b) and (c).


Question # 115In a homogeneous nuclear reactor, the __________ are mixed together.A. fuel & coolantB. fuel & moderatorC. coolant & moderatorD. none of these


Question # 116Enriched uranium means that, it containsA. more than 0.71% of U-235.B. only fertile material.C. only fissile material.D. no impurities.


Question # 117The radioisotope used to study the thyroid gland isA. iodineB. cobaltC. ironD. carbon


Question # 118Which of the following radiations is the least penetrating?A. a-raysB. ß-raysC. Y-raysD. X-rays


Question # 119Hydrogen differs from deuterium in __________ properties.A. radioactiveB. physicalC. chemicalD. all (a), (b) and (c)

Answer:-Option B




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Question # 120Both tritium and deuterium have the same number ofA. neutronsB. electronsC. protonsD. nucleons


Question # 121Nuclear power generation capacity in India isA. 3000 MW.B. 10000 MW.C. more than hydroelectric power generation capacity.D. more than thermal power generation capacity.


Question # 122Heavy water plant is not located atA. Kota and BarodaB. Talcher (Orissa)C. Tuticorin(Tamilnadu)D. Korba


Question # 123ß-rays emission in radioactive disintegration is always accompanied by the emission ofA. Y-raysB. a-raysC. neutronsD. none of these


Question # 124Out of the following, nucleus of __________ atom contains the largest number of neutrons.A. U-235B. U-238C. U-239D. Pu-239


Question # 125A radioactive substance does not emitA. a-rayB. protonC. positionD. ß-ray


Question # 126Indian monazite sand contains __________ percent thorium.A. 10B. 25C. 60




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D. 90


Question # 127The half life period of a radioactive element depends upon theA. temperatureB. pressureC. amount of element presentD. none of these


Question # 128Unit of radioactivity isA. barnB. FermiC. AngstromD. Curie


Question # 129One 'amu' is equivalent toA. 9.31 MevB. 931 eVC. 931 MeVD. 931 J


Question # 130Pick out the wrong statement.A. a-particle emission from a radioactive element makes it electrically negative.B. ß-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.


Question # 131Which of the following undergoes fission reaction easily?A. U-235B. U-238C. Th-232D. none of these


Question # 132Percentage of heavy water in ordinary water is aroundA. 0.015B. 7.54C. 0.71D. 32.97


Question # 133




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Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made ofA. high carbon steel.B. molybdenum.C. zircalloy.D. boron or cadmium.


Question # 134Nucleus of 92U235 contains __________ protons.A. 92B. 235C. 143D. 325


Question # 135Pick 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.


Question # 136Thorium-232 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material.A. thorium-233B. uranium-235C. uranium-233D. plutonium-239


Question # 137The critical mass of a fissionable material can be reduced byA. heating it.B. cooling it.C. surrounding it by neutron reflecting material.D. surrounding it by neutron absorbing material.


Question # 138Primary purpose of a __________ nuclear reactor is to supply a high neutron flux of the order of 1013 to 1014 neutrons/cm2 second.A. researchB. powerC. breederD. homogeneous


Question # 139Heavy water plant is not located atA. TalcherB. TuticorinC. RamagundamD. Kota

Answer:-Option C




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Question # 140Which is not a fissile nuclear material?A. U-233B. U-235C. U-238D. Pu-239


Question # 141Nuclear fuel usually used in a Boiling Water Reactor (BWR) isA. plutoniumB. enriched uraniumC. natural uraniumD. thorium


Question # 142In ß-decay of radioactive material, the ratio of neutron to protonA. increases.B. remains same.C. decreases.D. is unpredictable; may increase or decrease.


Question # 143Energy produced in the nuclear fission is of the order of __________ MeV.A. 20B. 200C. 1000D. 2000


Question # 144Pressure in a Pressurised Water Reactor (PWR) is used forA. maintaining constant pressure in the primary cooling circuit under varying loads.B. superheating the steam.C. pressurising the water in the primary coolant circuit.D. none of these.


Question # 145Pick out the wrong statement.A. The disintegration rate of a radioactive substance can not be increased by heating it.B. Electrons have negligible mass and unit negative change.C. Deuterium atom has one proton and two neutrons in its nucleus.D. Cadmium is capable of absorbing neutrons.


Question # 146Water is a better coolant than a gas (like CO2, He, N2 etc.), because itA. is a better neutron moderator as well.B. requires comparatively smaller pumps and heat exchanger for a given heat transfer rate.C. has a better heat transfer characteristics, and it can be pressurised to attain a high temperature.




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D. all (a), (b) and (c).


Question # 147Percentage of the heavy water in ordi water is aroundA. 0.015B. 7.54C. 0.71D. 32.97


Question # 148Which of the following is not used as a moderator in nuclear reactor?A. Molten sodiumB. Light waterC. BerylliumD. Boron hydride


Question # 149Which of the following isotopes is not present in natural uranium?A. U-238B. U-234C. U-235D. U-232


Question # 150Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay)?A. Power reactorB. Research reactorC. Fast breeder reactorD. Heavy water plant


Question # 151Quantity of fissionable material (i.e. U-235) in natural uranium is __________ percent.A. 0.71B. 6.31C. 99.29D. 12.73


Question # 152Pick out the correct statement.A. Loss of electrons from neutral atoms produces negative ions.B. The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively.C. Gain of electrons by neutral atoms form cations.D. Proton to neutron ratio in a stable nucleus is 2 : 1.


Question # 153




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__________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section.A. NitrogenB. HydrogenC. HeliumD. Carbon dioxide


Question # 154Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located atA. Alwaye (in Kerala)B. Jadugoda (in Jharkhand)C. Kalpakkam (in Tamilnadu)D. Gopalpur coast (in Orissa)


Question # 155'Heavy water' is termed as 'heavy' because it isA. denser than water.B. an oxide of deuterium.C. a heavy liquid.D. an oxide of heavier isotope of oxygen.


Question # 156When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed asA. isomersB. isotopesC. isobarsD. isotones


Question # 157The new nucleus formed after ß-decay of a radioactive element hasA. less atomic numberB. less atomic weightC. more atomic numberD. more atomic weight


Question # 158The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus isA. lessB. moreC. sameD. much more


Question # 159Net efficiency of ordinary light water cooled nuclear reactor is about __________ percent.A. 32B. 52C. 72D. 88

Answer:-Option A




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Question # 160The atomic mass of an element is fractional, becauseA. of uncertainty principle.B. it may have isobars.C. it contains neutrons.D. it may have isotopes.


Question # 161A heterogeneous reactor is the one, in which the moderator and theA. coolant are different materials.B. coolant are present in different phases (e.g., heavy water and graphite).C. fuel are present in different phases (e.g. uranium and heavy water).D. none of these.


Question # 162Radioactivity of an isotope is expressed inA. barnB. MeVC. CurieD. Ergs=


Question # 163Extraction of uranium from its ore is done by __________ method.A. chemicalB. pyrometallurgicalC. physical beneficiationD. electrometallurgical


Question # 164Isotopes of an element have the sameA. number of neutronsB. mass numberC. electronic configurationD. atomic weight


Question # 165Nuclear power plant is not located atA. Talcher (Orissa)B. Rawatbhata (Rajasthan)C. Kalpakkam (Tamilnadu)D. Kaiga (Karnataka)


Question # 166Heavy water is used as a moderator in aA. pressurised water reactor (PWR).B. boiling water reactor (BWR).C. Candu reactor.




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D. molten sodium cooled reactor.


Question # 167Which of the following is a fuel for a fusion reactor (thermonuclear reactor)?A. Deuterium and tritiumB. U-233C. ThoriumD. Heavy water


Question # 168Positron is a/anA. nucleus having two protons.B. helium nucleus.C. electron with positive charge.D. nucleus with one proton and one neutron.


Question # 169Uranium is recovered from its ore (pitchblende) byA. froth floatation technique.B. leaching with sulphuric acid.C. smelting in a furnace.D. dissolving in water.


Question # 170Which of the following is the best nuclear fuel?A. Np- 239B. U-234C. Pu-239D. Th-236


Question # 171Pick out the correct statement.A. Positron is the antiparticle of electron.B. In a-decay, the ratio of neutron to proton decreases.C. Ionising power of ß-rays is higher than that of a-rays.D. Speed of a-rays is more than that of Y-rays.


Question # 172A pressurised water reactor (PWR) uses pressurised water as aA. coolant.B. working fluid in power turbine.C. moderator.D. none of these.


Question # 173




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Out of the following places, heavy water plant is not located atA. BarodaB. RamagundamC. TalcherD. Tuticorin


Question # 174The phenomenon of radioactivity was discovered byA. Madam CurieB. BacquerrelC. RoentgenD. J.J. Thomson


Question # 17575% of a radioactive element decays in 6 hours. Its half life period is __________ hours.A. 3/4B. 1/6C. 3D. 4


Question # 176Which 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 cooledB. CO2 gas cooledC. Pressurised waterD. Boiling water


Question # 177Which of the following accounts for the maximum energy release in the nuclear fission process?A. Kinetic energy of fission productsB. Radioactive decay of fission productsC. Instantaneous release of Y-raysD. Kinetic energy of neutrons


Question # 178In a pressurised water reactor (PWR), theA. fuel is natural uranium and heavy water acts both as moderator & coolant.B. coolant water boils in the core of the reactor.C. coolant water is pressurised to prevent bulk boiling of water in the core.D. use of moderator is not required.


Question # 179Liquid metal (e.g, . molten sodium) is preferred as a coolant in case of a/an __________ reactor.A. homogeneousB. graphite moderatedC. fast breederD. enriched uranium (3% U-235) fuelled

Answer:-Option C




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Question # 180Coolant used in a boiling water reactor isA. hydrogen gasB. waterC. steamD. a mixture of water & steam


Question # 181A thermal nuclear reactor compared to a fast breeder reactorA. uses slower neutrons for fission.B. uses faster neutrons for fission.C. gives higher power density.D. requires less fuel to run at the same power level.


Question # 182The phenomenon of nuclear fission is opposite to that ofA. radioactive decayB. thermionic emissionC. nuclear fusionD. combustion


Question # 183An ideal coolant for a nuclear reactor shouldA. be a good absorber of neutrons.B. be capable of attaining high temperature, only when it is pressurised.C. have high density, but low heat transfer co-efficient.D. be free from radiation damage and non-corrosive.


Question # 184The size of an atom is of the order of oneA. .AngstromB. fermiC. micronD. mm


Question # 185The molecular weight of heavy water isA. 10B. 18C. 20D. 36


Question # 186Which of the following is not a good moderating material?A. ConcreteB. BoronC. 18/8 stainless steel




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D. All (a), (b) and (c)


Question # 187The first underground nuclear test was conducted by India atA. JaisalmerB. PokharanC. KalpakkamD. Narora


Question # 188Main source of __________ is monazite sand.A. uraniumB. poloniumC. hafniumD. thorium


Question # 189A radioactive isotope undergoes decay with respect to time following __________ law.A. logarithmicB. exponentialC. linearD. inverse square


Question # 190Atoms of U-238 and U-235 differ in structure by threeA. electrons and three protonsB. protonsC. neutronsD. electrons


Question # 191Heavy water (D2O) in a nuclear reactor serves as aA. coolantB. moderatorC. both (a) & (b)D. neutron absorber


Question # 192Solar energy results from __________ reaction.A. fissionB. combustionC. thermonuclearD. none of these


Question # 193




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Which of the following nuclear materials is fissile?A. Uranium-238B. Thorium-232C. Plutonium-239D. None of these


Question # 194The main ore of uranium isA. pitchblendeB. monazite sandC. cassiteriteD. chalcopyrite


Question # 195Function of control rod in a nuclear reactor is to controlA. temperatureB. pressureC. fuel consumptionD. absorption of neutrons


Question # 196The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively isA. 1B. 0.5C. 2D. 4


Question # 197In nuclear reactions, __________ number is conserved.A. massB. atomicC. both (a) & (b)D. neither (a) nor (b)


Question # 198Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.A. equal toB. less thanC. more thanD. either more or less==


Question # 199The main ore of thorium isA. pitchblendeB. monazite sandC. limoniteD. galena

Answer:-Option B




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Question # 200Fast breeder reactors are most usable in India, because of our largest __________ deposits.A. thoriumB. plutoniumC. uraniumD. none of these


Question # 201'Light water' used as a coolant in nuclear reactor is nothing butA. ordinary water.B. mildly acidic (pH = 6) water.C. mildly alkaline (pH = 8) water.D. none of these.


Question # 202The emission of an a-particle causes the resultant nucleus to haveA. more atomic weight and less atomic number.B. less atomic weight and less atomic number.C. less atomic weight and more atomic number.D. none of these.


Question # 203Extraction of uranium from its ore is done using __________ methods.A. electrometallurgicalB. pyrometallurgicalC. chemicalD. physical beneficiation


Question # 204Coolant present in the primary circuit of a pressurised water reactor is high pressureA. sub cooled waterB. saturated waterC. superheated steamD. saturated steam


Question # 205First experimental observation of nuclear fission was done byA. PlaneB. RutherfordC. FermiD. Hahn and Strassman


Question # 206The half life period of a radiactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm.A. 1/4B. 1/8C. 1/2




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D. 1/16


Question # 207H2 is a better coolant than CO2, due to its relativelyA. lower density.B. higher specific heat.C. non-reactivity to uranium.D. lower neutron capture cross-section.


Question # 208A fast breeder reactorA. utilises fast neutrons for causing fission.B. converts fertile material (e.g., U-238) into fissile material (Pu-239).C. normally employs molten sodium as coolant.D. all (a), (b) and (c).


Question # 209U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent.A. 85B. 50C. 3D. 97


Question # 210Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) hasA. five operating research reactors (namely Apsara, Cirus Zerelina, Purnima and Dhurva).B. a 420 MW nuclear power plant.C. a very large capacity (100 tons/yr) heavy water plant.D. all (a), (b) and (c).


Question # 211Nucleus of tritium has __________ neutrons.A. 1B. 2C. 3D. 5


Question # 212Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) isA. 0.1B. 1C. 3D. 12


Question # 213




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Candu reactor is a __________ nuclcear reactor.A. natural uranium fuelled heavy water cooled & moderatedB. highly enriched uranium (85% U-235) fuelledC. homogeneousD. fast breeder


Question # 214Which of the following is a non-fissile material?A. Plutonium-239B. Uranium-235C. Uranium-233D. Thorium-232


Question # 215Use of molten metal as a coolant in fast breeder reactor helps inA. rapid heat transfer from the core.B. accelerating the reaction rate in the core.C. breeding neutrons.D. accelerating the neutrons.


Question # 216What is the average life of a radioactive atom having a 'half life period' of T?A. 1.44 TB. 0.144 TC. 14.4 TD. 2T


Question # 217Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor forA. achieving high degree of superheat in the steam.B. faster heat removal rate from the core.C. lowering the coolant circulation pressure.D. avoiding the mixing of water with radioactive sodium, as it may cause explosion.


Question # 218The main purpose of control rod in a nuclear reactor is to control theA. chain reaction and hence the power output by regulating the number of secondary neutrons causing fission.B. emission of hazardous radiation.C. conversion of fissile material into fertile material.D. velocity of the secondary neutrons.


Question # 219Which of the following is not an ore of uranium?A. PitchblendeB. KyaniteC. CarnotiteD. Rescolite

Answer:-Option B




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Question # 220Nuclear power reactor located at Tarapur is of __________ type.A. fast breederB. pressurised waterC. boiling waterD. gas cooled


Question # 221Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?A. N2B. HeC. CO2D. H2


Question # 222The number of neutrons in the nucleus of Uranium-233 (92U233) isA. 141B. 92C. 233D. 325


Question # 223The 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. 159B. 1837C. 2537D. 10000


Question # 224Heavy water is preferred over ordinary water as a coolant, because it.A. acts both as an efficient coolant as well as a moderator.B. can be heated to a higher temperature without pressurizing.C. is less prone to radiation damage.D. all (a), (b) and (c).


Question # 225An element having large number of __________ is most easily subjected to nuclear fission.A. protonsB. electronsC. neutronsD. nucleons


Question # 226Coolant used in a fast breeder reactor isA. molten sodiumB. heavy waterC. ordinary water




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D. helium


Question # 227Which of the following is the most harmful for the human being?A. ß-raysB. X-raysC. Y-raysD. ultra violet rays


Question # 228Molten sodium is used as a coolant in a fast breeder reactor, because of itsA. excellent moderating properties.B. neutron breeding capability.C. faster heat removal capability from the core.D. capability to increase the reaction rate in the core.


Question # 229Pick out the wrong statement.A. Atoms with same number of nucleons but different number of protons are called isobars.B. Atoms with same number of protons but different number of nucleons are called isoters.C. Out of a, ß, and Y-rays, the one having maximum penetration power are Y-rays.D. The product formed by emission of a-particle has mass number less by 4 units than the parent nuclide.


Question # 230The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because theA. fuel cost per unit power generated is less.B. thermal efficiency of the former is higher.C. maintenance cost of the former is less.D. none of these.


Question # 231Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is __________ kgf/cm2 .A. 0.2B. 7C. 35D. 50


Question # 232Heavy water used in the nuclear reactors to slow down the speed of neutrons isA. highly purified water.B. a compound of oxygen and deuterium.C. water having dissolved salts of heavy metals.D. none of these.


Question # 233




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The disintegration rate of a radioactive elementA. progressively increases.B. progressively decreases.C. remains constant throughout.D. may increase or decrease depending on the material.


Question # 234Pick out the wrong statement.A. The ratio of the density of the 'nucleus' to that of the 'atom' is 1012 .B. a-particle is identical with a doubly charged helium ion.C. The mass of deuterium atom is half that of helium atom.D. Gamma rays are high energy electrons.


Question # 235Neutrons have mass approximately equal to that of __________ atoms.A. hydrogenB. heliumC. deuteriumD. none of these





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