Nuclear Power Engineering MCQs

Option A: α-particle emission from a radioactive element makes it electrically negative

Option B: β-particle emission from a radioactive element makes it electrically positive

Option C: A radioactive element having a half life period of 20 years will completely disintegrated in 40 years

Option D: The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration

Correct Answer: A radioactive element having a half life period of 20 years will completely disintegrated in 40 years ✔

Option A: Atoms with same number of nucleons but different number of protons are called isobars

Option B: Atoms with same number of protons but different number of nucleons are called isoters

Option C: Out of α, β, and γ-rays, the one having maximum penetration power are γ-rays

Option D: The product formed by emission of α-particle has mass number less by 4 units than the parent nuclide

Correct Answer: Atoms with same number of protons but different number of nucleons are called isoters ✔

Option A: The nucleus of a hydrogen atom is identical with a proton

Option B: A, β-ray particle is identical with an electron

Option C: Mass of an electron is about 1/1800th of the lightest nucleus

Option D: Positron is heavier than a proton

Correct Answer: Positron is heavier than a proton ✔

Option A: The ratio of the density of the ‘nucleus’ to that of the ‘atom’ is 1012

Option B: α-particle is identical with a doubly charged helium ion

Option C: The mass of deuterium atom is half that of helium atom

Option D: Gamma rays are high energy electrons

Correct Answer: Gamma rays are high energy electrons ✔

Option A: Positron is the antiparticle of electron

Option B: In α-decay, the ratio of neutron to proton decreases

Option C: Ionising power of β-rays is higher than that of α-rays

Option D: Speed of α-rays is more than that of γ-rays

Correct Answer: Positron is the antiparticle of electron ✔

Option A: Loss of electrons from neutral atoms produces negative ions

Option B: The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively

Option C: Gain of electrons by neutral atoms form cations

Option D: Proton to neutron ratio in a stable nucleus is 2 : 1

Correct Answer: The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively ✔

Option A: The disintegration rate of a radioactive substance cannot be increased by heating it

Option B: Electrons have negligible mass and unit negative change

Option C: Deuterium atom has one proton and two neutrons in its nucleus

Option D: Cadmium is capable of absorbing neutrons

Correct Answer: Deuterium atom has one proton and two neutrons in its nucleus ✔

Option A: Deuterium

Option B: Ortho-hydrogen

Option C: Tritium

Option D: None of these

Correct Answer: Tritium ✔

Option A: Natural uranium fuelled heavy water cooled & moderated

Option B: Highly enriched uranium (85% U-235) fuelled

Option C: Homogeneous

Option D: Fast breeder

Correct Answer: Natural uranium fuelled heavy water cooled & moderated ✔

Option A: Pressurised water reactor (PWR)

Option B: Boiling water reactor (BWR)

Option C: Candu reactor

Option D: Molten sodium cooled reactor

Correct Answer: Candu reactor ✔

Option A: U-233

Option B: U-235

Option C: Pu-239

Option D: Th-232

Correct Answer: Th-232 ✔

Option A: More than 0.71% of U-235

Option B: Only fertile material

Option C: Only fissile material

Option D: No impurities

Correct Answer: More than 0.71% of U-235 ✔

Option A: Lithium

Option B: Helium

Option C: Deuterium

Option D: Hydrogen

Correct Answer: Helium ✔

Option A: Logarithmic

Option B: Exponential

Option C: Linear

Option D: Inverse square

Correct Answer: Exponential ✔

Option A: Ordinary water

Option B: Mildly acidic (pH = 6) water

Option C: Mildly alkaline (pH = 8) water

Option D: None of these

Correct Answer: Ordinary water ✔

Option A: 2 × 1023

Option B: 6 × 1023

Option C: 6 × 1032

Option D: 5 × 105

Correct Answer: 6 × 1023 ✔

Option A: Deuterium and tritium

Option B: U-233

Option C: Thorium

Option D: Heavy water

Correct Answer: Deuterium and tritium ✔

Option A: Manufacture of nuclear fuel elements/assemblies

Option B: Processing of uranium ore

Option C: Treatment of spent fuel

Option D: None of these

Correct Answer: Manufacture of nuclear fuel elements/assemblies ✔

Option A: Th-232

Option B: U-238

Option C: U-233

Option D: None of these

Correct Answer: U-233 ✔

Option A: Plutonium-239

Option B: Uranium-235

Option C: Uranium-233

Option D: Thorium-232

Correct Answer: Thorium-232 ✔

Option A: Less atomic number

Option B: Less atomic weight

Option C: More atomic number

Option D: More atomic weight

Correct Answer: Less atomic number ✔

Option A: 5

Option B: 10

Option C: 20

Option D: 30

Correct Answer: 10 ✔

Option A: Heating it

Option B: Cooling it

Option C: Surrounding it by neutron reflecting material

Option D: Surrounding it by neutron absorbing material

Correct Answer: Surrounding it by neutron reflecting material ✔

Option A: 9.31

Option B: 93.1

Option C: 931

Option D: 9310

Correct Answer: 931 ✔

Option A: β-rays

Option B: X-rays

Option C: γ-rays

Option D: Ultra violet rays

Correct Answer: γ-rays ✔

Option A: Graphite as moderator

Option B: Water as coolant

Option C: Molten sodium as coolant as well as moderator

Option D: U-235 as fuel

Correct Answer: U-235 as fuel ✔

Option A: Neutrons

Option B: Electrons

Option C: Protons

Option D: Nucleons

Correct Answer: Neutrons ✔

Option A: Uranium

Option B: Polonium

Option C: Hafnium

Option D: Thorium

Correct Answer: Thorium ✔

Option A: Producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron

Option B: Accelerating the neutrons

Option C: Power generation

Option D: None of these

Correct Answer: A. Producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron
bombardment on different materials ✔

Option A: Power generation

Option B: Treatment of certain diseases

Option C: Initiating nuclear fission and fusion

Option D: All A., B. and C.

Correct Answer: Treatment of certain diseases ✔

Option A: Atomic weights

Option B: Atomic numbers

Option C: Number of protons

Option D: Number of electrons

Correct Answer: Atomic weights ✔

Option A: Froth floatation technique

Option B: Leaching with sulphuric acid

Option C: Smelting in a furnace

Option D: Dissolving in water

Correct Answer: Leaching with sulphuric acid ✔

Option A: Pitchblende

Option B: Kyanite

Option C: Carnotite

Option D: Rescolite

Correct Answer: Kyanite ✔

Option A: Sustainment of chain reaction

Option B: Power generation on commercial scale

Option C: Economic power generation

Option D: None of these

Correct Answer: Sustainment of chain reaction ✔

Option A: Isomers

Option B: Isotopes

Option C: Isobars

Option D: Isotones

Correct Answer: Isotones ✔

Option A: Melting point, hence can be subjected to higher temperature

Option B: Density; hence core volume for a given power output would be smaller

Option C: Resistance to effects of irradiation

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Barn

Option B: MeV

Option C: Curie

Option D: Ergs

Correct Answer: Curie ✔

Option A: 1/4

Option B: 1/8

Option C: 1/2

Option D: 1/16

Correct Answer: 1/16 ✔

Option A: α & β

Option B: β & γ

Option C: γ & α

Option D: α, β, & γ

Correct Answer: β & γ ✔

Option A: Temperature

Option B: Pressure

Option C: Amount of element present

Option D: None of these

Correct Answer: None of these ✔

Option A: Temperature

Option B: Pressure

Option C: Amount

Option D: None of these

Correct Answer: None of these ✔

Option A: Fuel elements

Option B: Operating personnels

Option C: Walls of the reactor

Option D: None of these

Correct Answer: Operating personnels ✔

Option A: Lower density

Option B: Higher specific heat

Option C: Non-reactivity to uranium

Option D: Lower neutron capture cross-section

Correct Answer: Higher specific heat ✔

Option A: Kinetic energy of fission products

Option B: Radioactive decay of fission products

Option C: Instantaneous release of γ-rays

Option D: Kinetic energy of neutrons

Correct Answer: Kinetic energy of fission products ✔

Option A: 159

Option B: 1837

Option C: 2537

Option D: 10000

Correct Answer: 1837 ✔

Option A: Uranium oxide

Option B: Uranium hexafluoride

Option C: Uranium carbide

Option D: Uranium sulphate

Correct Answer: Uranium hexafluoride ✔

Option A: U-238

Option B: U-233

Option C: U-235

Option D: Pu-239

Correct Answer: U-235 ✔

Option A: Coolant

Option B: Working fluid in power turbine

Option C: Moderator

Option D: None of these

Correct Answer: Coolant ✔

Option A: Equal to

Option B: Less than

Option C: More than

Option D: Either more or less

Correct Answer: More than ✔

Option A: No

Option B: One

Option C: Two

Option D: Three

Correct Answer: Three ✔

Option A: Molten sodium

Option B: Light water

Option C: Beryllium

Option D: Boron hydride

Correct Answer: Molten sodium ✔

Option A: U-233

Option B: U-235

Option C: U-238

Option D: Pu-239

Correct Answer: U-238 ✔

Option A: Thorium

Option B: Plutonium

Option C: Uranium

Option D: None of these

Correct Answer: Thorium ✔

Option A: 1836 (approximately)

Option B: 1/1836 (approximately)

Option C: 1

Option D: ∞

Correct Answer: 1836 (approximately) ✔

Option A: Breeder reactor

Option B: Research reactor

Option C: Heterogeneous reactor

Option D: Liquid metal (e.g., molten sodium) cooled reactor

Correct Answer: Research reactor ✔

Option A: 10-24 cm2

Option B: 10-12 cm

Option C: 1 Angstrom

Option D: 10-24 cm

Correct Answer: 10-24 cm2 ✔

Option A: Mass number

Option B: Electronic configuration

Option C: Nuclear charge

Option D: Chemical properties

Correct Answer: Mass number ✔

Option A: Resembles steel in appearance

Option B: Is less hard (in the range of silver)

Option C: Is highly ductile

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: U-238

Option B: U-234

Option C: U-235

Option D: U-232

Correct Answer: U-232 ✔

Option A: 85

Option B: 50

Option C: 3

Option D: 97

Correct Answer: 3 ✔

Option A: Thermal

Option B: Fast breeder

Option C: Heavy water moderated

Option D: Enriched uranium

Correct Answer: Fast breeder ✔

Option A: Isotopes

Option B: Isomers

Option C: Isotones

Option D: Isobars

Correct Answer: Isomers ✔

Option A: °Angstrom

Option B: Fermi

Option C: Micron

Option D: mm

Correct Answer: °Angstrom ✔

Option A: Of uncertainty principle

Option B: It may have isobars

Option C: It contains neutrons

Option D: It may have isotopes

Correct Answer: It may have isotopes ✔

Option A: Sustainment of chain reaction

Option B: Power generation on commercial scale

Option C: Economic power generation

Option D: None of these

Correct Answer: Sustainment of chain reaction ✔

Option A: Neutrons

Option B: Electrons

Option C: Protons

Option D: Either B. or C.

Correct Answer: D. Either B. or C. ✔

Option A: Chemical

Option B: Nuclear

Option C: Physical

Option D: None of these

Correct Answer: Nuclear ✔

Option A: Electrons

Option B: Neutrons

Option C: Protons

Option D: Neutrons plus protons (i.e., nucleons)

Correct Answer: Neutrons ✔

Option A: Isotopes

Option B: Isobars

Option C: Isotones

Option D: None of these

Correct Answer: Isobars ✔

Option A: 20

Option B: 200

Option C: 1000

Option D: 2000

Correct Answer: 20 ✔

Option A: Calcium

Option B: Sodium

Option C: Mercury

Option D: Zinc

Correct Answer: Sodium ✔

Option A: 0.015

Option B: 7.54

Option C: 0.71

Option D: 32.97

Correct Answer: 0.015 ✔

Option A: 90U234

Option B: 90U238

Option C: 90U236

Option D: 92U236

Correct Answer: 90U234 ✔

Option A: Hydrogen gas

Option B: Water

Option C: Steam

Option D: A mixture of water & steam

Correct Answer: A mixture of water & steam ✔

Option A: 1

Option B: 0.5

Option C: 2

Option D: 4

Correct Answer: 1 ✔

Option A: α-ray

Option B: Proton

Option C: Position

Option D: β-ray

Correct Answer: Proton ✔

Option A: Protect the walls of the reactor from radiation damage

Option B: Absorb the fast neutrons

Option C: Slow down the secondary neutrons

Option D: Protect the fuel element from coming in contact with the coolant

Correct Answer: Protect the walls of the reactor from radiation damage ✔

Option A: It is difficult to control nuclear fusion reaction

Option B: The fuel required (i.e., deuterium & tritium) is scarce

Option C: It is difficult to initiate fusion reaction

Option D: Quantity of fuel required for initiating fusion reaction is prohibitively high

Correct Answer: It is difficult to control nuclear fusion reaction ✔

Option A: Can’t attain high temperature at normal pressure

Option B: Is not at all corrosive, even at a higher temperature

Option C: Is highly radioactive at elevated temperatures and can cause explosion, when it comes in

Option D: None of these

Correct Answer: C. Is highly radioactive at elevated temperatures and can cause explosion, when it comes in
contact with air or water ✔

Option A: U-235

Option B: U-238

Option C: U-239

Option D: Pu-239

Correct Answer: U-239 ✔

Option A: 3.125

Option B: 6.25

Option C: 12.50

Option D: 25

Correct Answer: 6.25 ✔

Option A: X

Option B: α and β

Option C: Neutrons & gamma

Option D: Infrared

Correct Answer: Neutrons & gamma ✔

Option A: Graphite

Option B: Cadmium

Option C: Zircaloy (an alloy of zirconium and aluminium)

Option D: Stainless steel

Correct Answer: Graphite ✔

Option A: 0.01

Option B: 0.25

Option C: 1.2

Option D: 7

Correct Answer: 0.25 ✔

Option A: Pitchblende

Option B: Monazite sand

Option C: Limonite

Option D: Galena

Correct Answer: Monazite sand ✔

Option A: Plutonium

Option B: Uranium

Option C: Radium

Option D: Neptunium

Correct Answer: Plutonium ✔

Option A: Use Th-232 as fissile fuel

Option B: Convert fertile material to fissile material

Option C: Use fast neutrons for fission

Option D: Use molten sodium as coolant

Correct Answer: Use Th-232 as fissile fuel ✔

Option A: 0.71

Option B: 6.31

Option C: 99.29

Option D: 12.73

Correct Answer: 0.71 ✔

Option A: Electrometallurgical

Option B: Pyrometallurgical

Option C: Chemical

Option D: Physical beneficiation

Correct Answer: Chemical ✔

Option A: 1100

Option B: 2200

Option C: 3300

Option D: 4400

Correct Answer: 2200 ✔

Option A: Barn

Option B: Fermi

Option C: Angstrom

Option D: Curie

Correct Answer: Curie ✔

Option A: Cannot attain a high temperature

Option B: Is more efficient as gas has a higher specific heat

Option C: Can produce only saturated steam for feeding to power turbine

Option D: None of these

Correct Answer: None of these ✔

Option A: Uranium-238

Option B: Thorium-232

Option C: Plutonium-239

Option D: None of these

Correct Answer: Plutonium-239 ✔

Option A: 105

Option B: 108

Option C: 1012

Option D: 1015

Correct Answer: 105 ✔

Option A: Mass number

Option B: Electronic configuration

Option C: Nuclear charge

Option D: Chemical properties

Correct Answer: Mass number ✔

Option A: Slows down

Option B: Absorbs

Option C: Accelerates

Option D: Reflects

Correct Answer: Slows down ✔

Option A: α

Option B: β

Option C: γ

Option D: α & β

Correct Answer: γ ✔

Option A: Chemical

Option B: Pyrometallurgical

Option C: Physical beneficiation

Option D: Electrometallurgical

Correct Answer: Chemical ✔

Option A: 92U238

Option B: 92U235

Option C: 92U234

Option D: None of these

Correct Answer: 92U238 ✔

Option A: Coolant water is allowed to boil in the core of the reactor

Option B: Coolant water, after being heated in the reactor core, generates steam in a boiler

Option C: Pressurised water is pumped into the core

Option D: Fuel and the coolant are thoroughly mixed to form a homogeneous solution

Correct Answer: Coolant water is allowed to boil in the core of the reactor ✔