Q.1

Liquid metal (e.g, . molten sodium) is preferred as a coolant in case of a/an __________ reactor.

  • homogeneous
  • graphite moderated
  • fast breeder
  • enriched uranium (3% U-235) fuelled
Q.2

Coolant used in a boiling water reactor is

  • hydrogen gas
  • water
  • steam
  • a mixture of water & steam
Q.3

Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage.

  • fuel elements
  • operating personnels
  • walls of the reactor
  • none of these
Q.4

of a radioactive element decays in 6 hours. Its half life period is __________ hours.

  • 3/4
  • 1/6
  • 3
  • 4
Q.5

Nuclear power plant is not located at

  • Talcher (Orissa)
  • Rawatbhata (Rajasthan)
  • Kalpakkam (Tamilnadu)
  • Kaiga (Karnataka)
Q.6

Pick out the wrong statement.

  • The disintegration rate of a radioactive substance can not be increased by heating it.
  • Electrons have negligible mass and unit negative change.
  • Deuterium atom has one proton and two neutrons in its nucleus.
  • Cadmium is capable of absorbing neutrons.
Q.7

Out of the following places, heavy water plant is not located at

  • Baroda
  • Ramagundam
  • Talcher
  • Tuticorin
Q.8

Pick out the correct statement.

  • Positron is the antiparticle of electron.
  • In α-decay, the ratio of neutron to proton decreases.
  • Ionising power of β-rays is higher than that of α-rays.
  • Speed of α-rays is more than that of γ-rays.
Q.9

Quantity of fissionable material (i.e. U-in natural uranium is __________ percent.

  • 0.71
  • 6.31
  • 99.29
  • 12.73
Q.10

A thermal nuclear reactor compared to a fast breeder reactor

  • uses slower neutrons for fission.
  • uses faster neutrons for fission.
  • gives higher power density.
  • requires less fuel to run at the same power level.
Q.11

The atomic mass of an element is fractional, because

  • of uncertainty principle.
  • it may have isobars.
  • it contains neutrons.
  • it may have isotopes.
Q.12

Heavy water is used as a moderator in a

  • pressurised water reactor (PWR).
  • boiling water reactor (BWR).
  • Candu reactor.
  • molten sodium cooled reactor.
Q.13

Water is a better coolant than a gas (like CO2, He, N2 etc.), because it

  • is a better neutron moderator as well.
  • requires comparatively smaller pumps and heat exchanger for a given heat transfer rate.
  • has a better heat transfer characteristics, and it can be pressurised to attain a high temperature.
  • all (a), (b) and (c).
Q.14

Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor ?

  • Molten sodium cooled
  • CO2 gas cooled
  • Pressurised water
  • Boiling water
Q.15

Pick out the correct statement.

  • Loss of electrons from neutral atoms produces negative ions.
  • The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively.
  • Gain of electrons by neutral atoms form cations.
  • Proton to neutron ratio in a stable nucleus is 2 : 1.
Q.16

A heterogeneous reactor is the one, in which the moderator and the

  • coolant are different materials.
  • coolant are present in different phases (e.g., heavy water and graphite).
  • fuel are present in different phases (e.g. uranium and heavy water).
  • none of these.
Q.17

Which of the following is a fuel for a fusion reactor (thermonuclear reactor) ?

  • Deuterium and tritium
  • U-233
  • Thorium
  • Heavy water
Q.18

Net efficiency of ordinary light water cooled nuclear reactor is about __________ percent.

  • 32
  • 52
  • 72
  • 88
Q.19

Unit of radioactivity is

  • barn
  • Fermi
  • Angstrom
  • Curie
Q.20

One 'amu' is equivalent to

  • 9.31 Mev
  • 931 eV
  • 931 MeV
  • 931 J
Q.21

Uranium ore is mined & concentrated in India at

  • Jadugoda(Jharkhand)
  • Kota (Rajasthan)
  • Tuticorin (Tamilnadu)
  • Talchar (Orissa)
Q.22

Nuclear power generation capacity in India is

  • 3000 MW.
  • 10000 MW.
  • more than hydroelectric power generation capacity.
  • more than thermal power generation capacity.
Q.23

__________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section.

  • Nitrogen
  • Hydrogen
  • Helium
  • Carbon dioxide
Q.24

Radioactivity of an isotope is expressed in

  • barn
  • MeV
  • Curie
  • Ergs
Q.25

The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is

  • less
  • more
  • same
  • much more
Q.26

Which of the following reactors is operated at high neutron flux and low power level ?

  • Breeder reactor.
  • Research reactor.
  • Heterogeneous reactor.
  • Liquid metal (e.g., molten sodium) cooled reactor.
Q.27

Which of the following undergoes fission reaction easily ?

  • U-235
  • U-238
  • Th-232
  • none of these
Q.28

Which of the following factors is the most important in the site selection for a nuclear power plant ?

  • Absence of earthquake prone zone in nearby areas.
  • Abundant availability of water.
  • Remotely located from residential areas.
  • Proximity to fuel source.
Q.29

Heavy water plant is not located at

  • Kota and Baroda
  • Talcher (Orissa)
  • Tuticorin(Tamilnadu)
  • Korba
Q.30

Uranium percentage in monazite sand is about

  • 0.01
  • 0.25
  • 1.2
  • 7
0 h : 0 m : 1 s