Q.1

Nuclear fuel usually used in a Boiling Water Reactor (BWR) is

  • plutonium
  • enriched uranium
  • natural uranium
  • thorium
Q.2

β-rays emission in radioactive disintegration is always accompanied by the emission of

  • γ-rays
  • α-rays
  • neutrons
  • none of these
Q.3

Indian monazite sand contains __________ percent thorium.

  • 10
  • 25
  • 60
  • 90
Q.4

Pick out the wrong statement.

  • α-particle emission from a radioactive element makes it electrically negative.
  • β-particle emission from a radioactive element makes it electrically positive.
  • A radioactive element having a half life period of 20 years will completely disintegrated in 40 years.
  • The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration.
Q.5

The molecular weight of heavy water is

  • 10
  • 18
  • 20
  • 36
Q.6

Which of the following is not a good moderating material ?

  • Concrete
  • Boron
  • 18/8 stainless steel
  • All (a), (b) and (c)
Q.7

The new nucleus formed after β-decay of a radioactive element has

  • less atomic number
  • less atomic weight
  • more atomic number
  • more atomic weight
Q.8

Hydrogen differs from deuterium in __________ properties.

  • radioactive
  • physical
  • chemical
  • all (a), (b) and (c)
Q.9

Percentage of the heavy water in ordi water is around

  • 0.015
  • 7.54
  • 0.71
  • 32.97
Q.10

Energy produced in the nuclear fission is of the order of __________ MeV.

  • 20
  • 200
  • 1000
  • 2000
Q.11

Both tritium and deuterium have the same number of

  • neutrons
  • electrons
  • protons
  • nucleons
Q.12

The phenomenon of nuclear fission is opposite to that of

  • radioactive decay
  • thermionic emission
  • nuclear fusion
  • combustion
Q.13

An ideal coolant for a nuclear reactor should

  • be a good absorber of neutrons.
  • be capable of attaining high temperature, only when it is pressurised.
  • have high density, but low heat transfer co-efficient.
  • be free from radiation damage and non-corrosive.
Q.14

The size of an atom is of the order of one

  • °Angstrom
  • fermi
  • micron
  • mm
Q.15

'Light water' used as a coolant in nuclear reactor is nothing but

  • ordinary water.
  • mildly acidic (pH = 6) water.
  • mildly alkaline (pH = 8) water.
  • none of these.
Q.16

Isotopes of an element have different

  • mass number
  • electronic configuration
  • nuclear charge
  • chemical properties
Q.17

Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at

  • Alwaye (in Kerala)
  • Jadugoda (in Jharkhand)
  • Kalpakkam (in Tamilnadu)
  • Gopalpur coast (in Orissa)
Q.18

Positron is a/an

  • nucleus having two protons.
  • helium nucleus.
  • electron with positive charge.
  • nucleus with one proton and one neutron.
Q.19

Which of the following accounts for the maximum energy release in the nuclear fission process ?

  • Kinetic energy of fission products
  • Radioactive decay of fission products
  • Instantaneous release of γ-rays
  • Kinetic energy of neutrons
Q.20

'Heavy water' is termed as 'heavy' because it is

  • denser than water.
  • an oxide of deuterium.
  • a heavy liquid.
  • an oxide of heavier isotope of oxygen.
Q.21

A pressurised water reactor (PWR) uses pressurised water as a

  • coolant.
  • working fluid in power turbine.
  • moderator.
  • none of these.
Q.22

Uranium is recovered from its ore (pitchblende) by

  • froth floatation technique.
  • leaching with sulphuric acid.
  • smelting in a furnace.
  • dissolving in water.
Q.23

Which of the following isotopes is not present in natural uranium ?

  • U-238
  • U-234
  • U-235
  • U-232
Q.24

In a pressurised water reactor (PWR), the

  • fuel is natural uranium and heavy water acts both as moderator & coolant.
  • coolant water boils in the core of the reactor.
  • coolant water is pressurised to prevent bulk boiling of water in the core.
  • use of moderator is not required.
Q.25

Isotopes of an element have the same

  • number of neutrons
  • mass number
  • electronic configuration
  • atomic weight
Q.26

Extraction of uranium from its ore is done by __________ method.

  • chemical
  • pyrometallurgical
  • physical beneficiation
  • electrometallurgical
Q.27

Pressure in a Pressurised Water Reactor (PWR) is used for

  • maintaining constant pressure in the primary cooling circuit under varying loads.
  • superheating the steam.
  • pressurising the water in the primary coolant circuit.
  • none of these.
Q.28

The phenomenon of radioactivity was discovered by

  • Madam Curie
  • Bacquerrel
  • Roentgen
  • J.J. Thomson
Q.29

Which of the following is the best nuclear fuel?

  • Np- 239
  • U-234
  • Pu-239
  • Th-236
Q.30

Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay) ?

  • Power reactor
  • Research reactor
  • Fast breeder reactor
  • Heavy water plant
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