Q.1
Nuclear power reactor located at Tarapur is of __________ type.
Q.2

Hydrogen has __________ isotopes.

  • no
  • one
  • two
  • three
Q.3

Hydrogen bomb employs the nuclear fusion of

  • hydrogen
  • deuterium
  • tritium
  • helium
Q.4

Fast breeder reactors do not

  • use Th-232 as fissile fuel.
  • convert fertile material to fissile material.
  • use fast neutrons for fission.
  • use molten sodium as coolant.
Q.5

Spent fuel from the nuclear thermal reactor contains

  • fission products
  • plutonium
  • unused fuel
  • all (a), (b) & (c)
Q.6

MeV is the unit of

  • radioactivity
  • energy
  • potential difference
  • none of these
Q.7

Sodium melts (at atmospheric pressure) at a temperature of __________ °C.

  • 58
  • 98
  • 348
  • 588
Q.8

The ratio of volume of an atom to that of its nucleus is

  • 1012
  • 10-12
  • 10-8
  • 108
Q.9

Thorium-is converted into uranium-in a/an __________ nuclear reactor.

  • thermal
  • fast breeder
  • heavy water moderated
  • enriched uranium
Q.10

Which of the following is not, a fertile material ?

  • Th-232
  • U-238
  • U-233
  • none of these
Q.11

A boiling water reactor is the one, in which the

  • coolant water is allowed to boil in the core of the reactor.
  • coolant water, after being heated in the reactor core, generates steam in a boiler.
  • pressurised water is pumped into the core.
  • fuel and the coolant are thoroughly mixed to form a homogeneous solution.
Q.12

Which is used as a coolant in nuclear reactor due to its high capture cross-section ?

  • H2
  • N2
  • He
  • CO2
Q.13

The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump.

  • electromagnetic
  • reciprocating
  • centrifugal
  • volute
Q.14

Which is the most commonly used molten metal for cooling of nuclear reactors ?

  • Calcium
  • Sodium
  • Mercury
  • Zinc
Q.15

The atomic number of a radioactive element is not changed, when it emits __________ rays.

  • α
  • β
  • γ
  • α & β
Q.16

The decay product of tritium (a beta emitter) is

  • lithium
  • helium
  • deuterium
  • hydrogen
Q.17

Which of the following may be used to measure the rate of nuclear disintegration?

  • Geiger-Muller Counter
  • Cyclotron
  • Cold chamber
  • Mass spectrograph
Q.18

Velocity of the thermal neutron (< 0.eV) used for fission of U-is around __________ m/sec.

  • 1
  • 2200
  • 3 x 1011
  • 9 x 1021
Q.19

Energy equivlant to one atomic mass unit (amu) is __________ MeV.

  • 9.31
  • 93.1
  • 931
  • 9310
Q.20

Research reactors are normally meant for

  • producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron bombardment on dif ferent materials.
  • accelerating the neutrons.
  • power generation.
  • none of these
Q.21

Which of the following may not need a control rod ?

  • Liquid metal cooled reactor.
  • Fast breeder reactor.
  • Candu reactor.
  • None of these.
Q.22

One 'amu' is equivalent to

  • 9.31 MeV
  • 931 eV
  • 931 Mev
  • 931J
Q.23

Molten sodium (as a coolant in fast breeder reactor)

  • can't attain high temperature at normal pressure.
  • is not at all corrosive, even at a higher temperature.
  • is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water.
  • none of these
Q.24

Moderating material used in a thermal-reactor should be a

  • good absorber of neutrons.
  • solid substance.
  • poor absorber of neutrons.
  • none of these.
Q.25

Ordinary water is not used as a moderator because, it

  • has a low absorption cross-section.
  • has a low scattering cross-section.
  • absorbs neutrons.
  • does not absorb neutrons.
Q.26

Fast breeder Test Reactor (FBTR) is located at

  • Kalpakkam (near Madras).
  • Kota (in Rajasthan).
  • BARC (Trombay).
  • Tarapur (in Maharashtra).
Q.27

The amount of a radioactive material (having a half life ofyears) remaining afteryears will be __________ of its original weight.

  • 1/2
  • 1/4
  • 1/8
  • 1/16
Q.28

Heat is generated in a nuclear reactor (thermal) by

  • combustion of a nuclear fuel e.g. uranium.
  • fusion of atoms of uranium.
  • absorption of neutrons in uranium atoms.
  • fission of U-235 by neutrons.
Q.29

The decrease in the atomic number is not observed in case of

  • electron capture
  • β-emission
  • α-emission
  • positron emission
Q.30

"Critical mass" is the minimum mass of nuclear fissile material required for the

  • sustainment of chain reaction.
  • power generation on commercial scale.
  • economic power generation.
  • none of these.
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