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
76.
Which of these is used as moderator in nuclear reactor

a
Uraphite
b
Helium gas
c
Heavy water
d
All of the above

77.
'Critical mass' is the minimum mass of nuclear fissile material required for the

a
economic power generation.
b
sustainment of chain reaction.
c
power generation on commercial scale.
d
none of these

78.
The half life period of a radioactive element depends on its

a
amount
b
pressure
c
temperature
d
none of these

79.
New nucleus after alpha particle decay is called

a
parent nucleus
b
decayed nucleus
c
daughter nucleus
d
undecayed nucleus

80.
As compare to proton, mass of neutron is

a
0.1 % greater
b
1 % greater
c
5 % greater
d
10 % greater

81.
Percentage of U-238 in natural uranium is around

a
0.015
b
0.71
c
29.71
d
99.29

82.
The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to gm.

a
1/2
b
1/4
c
1/8
d
1/16

83.
The time taken for a radioactive element to reduce to 50 % of its original weight is years, if its half life period is 12 years.

a
6
b
18
c
24
d
48

84.
'No two electrons in an atom can have the same set of four quantum numbers' is

a
Bohr's law
b
Newton's law
c
Aufbau principle
d
Pauli's exclusive principle

85.
Thermal nuclear reactors using enriched uranium as fuel contains a maximum of percent fissile material i.e. U-235.

a
1
b
2
c
3
d
4

86.
Most stable isotope in nature is of

a
iron-56
b
carbon-12
c
uranium-235
d
uranium-238

87.
The mass number of an element is not changed, when it emits radiations.

a
a & b
b
g & a
c
b & g
d
a, b, & g

88.
According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called

a
An atom
b
An anion
c
A cation
d
A molecule

89.
Nuclear power plant in Karnataka is located at

a
Kaiga
b
Sandur
c
Raichur
d
Bhadravathi

90.
First experimental observation of nuclear fission was done by

a
Fermi
b
Plane
c
Rutherford
d
Hahn and Strassman

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