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Nuclear Science mcq questions and answers for competitive exams

Ramya_naidu

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Nuclear Science mcq questions and answers for competitive exams UPSC SSC , SSC CGL, SSC CHSL, upsc Civils , Entrance exams Online test practice online free Quiz, mock practice online
46.
Nucleus of tritium has neutrons.

a
1
b
2
c
3
d
4
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47.
A boiling water reactor is the one, in which the

a
pressurised water is pumped into the core.
b
coolant water is allowed to boil in the core of the reactor.
c
fuel and the coolant are thoroughly mixed to form a homogeneous solution.
d
coolant water, after being heated in the reactor core, generates steam in a boiler.
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48.
Which of the following types of nuclear reactors is most prone to radioactive hazards?

a
Gas cooled reactor
b
Boiling water reactor
c
Pressurised water reactor
d
Molten sodium cooled reactor
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49.
nuclear reactor does not require a heat exchanger to supply steam to power turbine.

a
Boiling water
b
Helium cooled
c
Pressurised water
d
Molten sodium cooled
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50.
Fuel for a nuclear reactor (thermal) is

a
radium
b
uranium
c
plutonium
d
none of these
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51.
Process by which energy is released in sun is

a
fusion
b
fission
c
radioactivity
d
Haber's process
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52.
The function of moderators in nuclear reactor is to

a
control the chain reaction.
b
absorb the secondary neutrons.
c
slow down the secondary neutrons.
d
none of these.
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53.
Isotopes are separated by

a
Filtration
b
Distillation
c
Sublimation
d
Crystallization
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54.
Thermal neutrons which are used to cause the fission of U-235 have energy_eV.

a
< 0.025
b
>1
c
1-25
d
> 200
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55.
Function of control rod in a nuclear reactor is to control

a
pressure
b
temperature
c
fuel consumption
d
absorption of neutrons
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56.
Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of percent of U-235 (i.e. fissile material).

a
15
b
45
c
65
d
85
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57.
The most commonly used nuclear fuel in boiling water reactor is

a
plutonium
b
monazite sand
c
natural uranium
d
enriched uranium
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58.
The energy released by the decay of one U-235 atom will be of the order of

a
10 MeV
b
100 MeV
c
1000 MeV
d
10000 MeV
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59.
A fast breeder reactor employs

a
U-235 as fuel.
b
water as coolant.
c
graphite as moderator.
d
molten sodium as coolant as well as moderator.
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60.
Which one is radioactive in nature?

a
Helium
b
Tritium
c
Deuterium
d
Heavy hydrogen
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