Recently Asked Nuclear Engineering Objective Questions In Competitive’s Part – 3
Q – 201 Molten 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
Ans- Option C
Q – 202 Which of the following is not, a fertile material?
A. Th-232
B. U-238
C. U-233
D. none of these
Ans- Option C
Q – 203 The atomic number of an element is equal to the number of __________ present in its atom.
A. neutrons
B. electrons
C. protons
D. either (b) or (c)
Ans- Option D
Q – 204 Which 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.
Ans- Option A
Q – 205 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.
Ans- Option D
Q – 206 Fission of U-235 on slow neutron bombardment can be represented by
A. 92U235 + 3 γ1 56Ba143 + 36Kr90
B. 92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1
C. 92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1 + Q (energy)
D. 92U235 + 0n1 92U236 + 30n1+ Q (energy)
Ans- Option C
Q – 207 The atomic number of a radioactive element is not changed, when it emits __________ rays.
A. α
B. β
C. γ
D. α & β
Ans- Option C
Q – 208 Ordinary water is not used as a moderator because, it
A. has a low absorption cross-section.
B. has a low scattering cross-section.
C. absorbs neutrons.
D. does not absorb neutrons.
Ans- Option C
Q – 209 Moderating material used in a thermal-reactor should be a
A. good absorber of neutrons.
B. solid substance.
C. poor absorber of neutrons.
D. none of these.
Ans- Option C
Q – 210 Which is used as a coolant in nuclear reactor due to its high capture cross-section ?
A. H2
B. N2
C. He
D. CO2
Ans- Option A
Q – 211 A boiling water reactor is the one, in which the
A. 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.
Ans- Option A
Q – 212 Spent fuel from the nuclear thermal reactor contains
A. fission products
B. plutonium
C. unused fuel
D. all (a), (b) & (c)
Ans- Option D
Q – 213 Which 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.
Ans- Option D
Q – 214 Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor.
A. thermal
B. fast breeder
C. heavy water moderated
D. enriched uranium
Ans- Option B
Q – 215 Fast breeder reactors do not
A. 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.
Ans- Option A
Q – 216 One ‘amu’ is equivalent to
A. 9.31 MeV
B. 931 eV
C. 931 Mev
D. 931J
Ans- Option C
Q – 217 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.
Ans- Option A
Q – 218 The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent.
A. 3.125
B. 6.25
C. 12.50
D. 25
Ans- Option B
Q – 219 Which of the following may not need a moderator?
A. Candu reactor
B. Fast breeder reactor
C. Homogeneous reactor
D. Pressurised water reactor
Ans- Option B
Q – 220 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. 18
C. 6
D. 36
Ans- Option B
Q – 221 Heat is generated in a nuclear reactor (thermal) by
A. 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.?
Ans- Option D
Q – 222 The decay product of tritium (a beta emitter) is
A. lithium
B. helium
C. deuterium
D. hydrogen?
Ans- Option B
Q – 223 Gas cooling as compared to water cooling of nuclear reactors
A. 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.
Ans- Option D
Q – 224 Which of the following is artificially produced as it does not occur in nature ?
A. Uranium-235
B. Uranium-233
C. Plutonium-239
D. Both (b) and (c)
Ans- Option D
Q – 225 The second underground nuclear test was conducted by India at
A. Jaisalmer
B. Pokhran
C. Kalpakkan
D. Narora
Ans- Option B
Q – 226 The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight.
A. 1/2
B. 1/4
C. 1/8
D. 1/16
Ans- Option D
Q – 227 Which is the most commonly used molten metal for cooling of nuclear reactors ?
A. Calcium
B. Sodium
C. Mercury
D. Zinc
Ans- Option B
Q – 228 An electron has a mass that is approximately __________ that of the proton.
A. 1836 (approximately)
B. 1/1836 (approximately)
C. 1
D. ∞?
Ans- Option B
Q – 229 Which of the following is not a naturally occurring nuclear fuel
A. Uranium-238
B. Thorium-233
C. Plutonium-239
D. None of these
Ans- Option C
Q – 230 The mass number of an element is not changed, when it emits __________ radiations.
A. α & β
B. β & γ
C. γ & α
D. α, β, & γ?
Ans- Option B
Q – 231 The decrease in the atomic number is not observed in case of
A. electron capture
B. β-emission
C. α-emission
D. positron emission?
Ans- Option B
Q – 232 Which of the following may be used to measure the rate of nuclear disintegration?
A. Geiger-Muller Counter
B. Cyclotron
C. Cold chamber
D. Mass spectrograph?
Ans- Option A
Q – 233 What is the history of Nuclear Engineering?
Ans- Nuclear engineering was born in the 20th century with the announcement in 1939 of the discovery of nuclear fission by the German chemists.
Q – 234 Do you know what does a nuclear engineer do?
Ans- Developing nuclear equipment, such as reactor cores and radiation shielding
Monitoring nuclear plant design, construction and operations to ensure that the plants meet safety standards
Writing instructions for the handling and disposal of nuclear waste
Testing whether methods of using nuclear material, reclaiming nuclear fuel or disposing of nuclear waste are acceptable
Taking corrective action or ordering plant shutdowns in emergencies
Examining nuclear accidents and gathering data that can be used to prevent future accidents
Q – 235 Do you know what is Nuclear Engineering?
Ans- 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 the application of other sub-atomic physics, based on the principles of nuclear physics.