Practice Nuclear Power Engineering Multiple Choice Questions with Answers Quiz-13

Q.1.

Thorium-(a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material.

thorium-233
uranium-235
uranium-233
plutonium-239

Q.2.

A fast breeder reactor

uses natural uranium as fuel.
does not require a moderator.
both (a) and (b).
neither (a) nor (b).

Q.3.

Heavy water has maximum density at __________ °C.

4
11.6
0
18.6

Q.4.

Pick out the wrong statement.

Isotopes have the same number of protons & electrons, but different number of neutrons.
Hydrogen has two isotopes.
In ordinary hydrogen, ₁H¹ and ₁H² are present in the ratio 6400:1.
none of these.

Q.5.

Artificially produced radioactive isotopes are used for

power generation.
treatment of certain diseases.
initiating nuclear fission and fusion.
all (a), (b) and (c).

Q.6.

In a homogeneous nuclear reactor, the __________ are mixed together.

fuel & coolant
fuel & moderator
coolant & moderator
none of these

Q.7.

Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays.

X
α and β
neutrons & gamma
infrared

Q.8.

Percentage of heavy water in ordinary water is around

0.015
7.54
0.71
32.97

Q.9.

Ceramic nuclear metals compared to solid nuclear metals have

higher melting points.
low strength at high temperature.
more chances of radiation damage.
poorer corrosion resistance.

Q.10.

The most abundant isotope of natural uranium is

₉₂U²³⁸
₉₂U²³⁵
₉₂U²³⁴
none of these

Q.11.

Out of the following, nucleus of __________ atom contains the largest number of neutrons.

U-235
U-238
U-239
Pu-239

Q.12.

Mass of a positron is same as that of a/an

electron
α-particle
proton
neutron

Q.13.

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.14.

Which of the following is not used as a moderator in nuclear reactor ?

Molten sodium
Light water
Beryllium
Boron hydride

Q.15.

The mass number of an element is equal to the number of __________ in the nucleus.

electrons
neutrons
protons
neutrons plus protons (i.e., nucleons)

Q.16.

Plutonium

is recovered from spent fuel from thermal nuclear reactor.
has much lower melting point (640°C ) compared to thorium (1690°C).
both (a) and (b).
neither (a) nor (b).

Q.17.

Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for

achieving high degree of superheat in the steam.
faster heat removal rate from the core.
lowering the coolant circulation pressure.
avoiding the mixing of water with radioactive sodium, as it may cause explosion.

Q.18.

H₂ is a better coolant than CO₂, due to its relatively

lower density.
higher specific heat.
non-reactivity to uranium.
lower neutron capture cross-section.

Q.19.

Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of

high carbon steel.
molybdenum.
zircalloy.
boron or cadmium.

Q.20.

Pick out the wrong statement.

Atoms with same number of nucleons but different number of protons are called isobars.
Atoms with same number of protons but different number of nucleons are called isoters.
Out of α, β, and γ-rays, the one having maximum penetration power are γ-rays.
The product formed by emission of α-particle has mass number less by 4 units than the parent nuclide.

Q.21.

Commercial power generation from fusion reactor is not yet possible, because

it is difficult to control nuclear fusion reaction.
the fuel required (i.e., deuterium & tritium) is scarce.
it is difficult to initiate fusion reaction.
quantity of fuel required for initiating fusion reaction is prohibitively high.

Q.22.

Fast breeder reactors are most usable in India, because of our largest __________ deposits.

thorium
plutonium
uranium
none of these

Q.23.

Isotopes of an element have different

mass number
electronic configuration
nuclear charge
chemical properties

Q.24.

Radioactive decay of a material involves a __________ order reaction.

third
second
first
zero

Q.25.

In β-decay of radioactive material, the ratio of neutron to proton

increases.
remains same.
decreases.
is unpredictable; may increase or decrease.

Q.26.

The half life period of a radioactive element depends upon the

temperature
pressure
amount of element present
none of these

Q.27.

A control rod

should have small absorption cross-section.
is generally made of boron, hafnium or cadmium.
should have large absorption cross-section.
both (b) and (c).

Q.28.

Number of secondary neutron emitted on fission of an atom of U-by slow neutron bombardment is

3
235
200
92

Q.29.

The main purpose of control rod in a nuclear reactor is to control the

chain reaction and hence the power output by regulating the number of secondary neutrons causing fission.
emission of hazardous radiation.
conversion of fissile material into fertile material.
velocity of the secondary neutrons.

Q.30.

The half life period of a radiactive element isdays. Afterdays, one gm of the element will be reduced to __________ gm.

1/4
1/8
1/2
1/16

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