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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
31.
have the same mass number, but different nuclear charge.

a
Isobars
b
Isotopes
c
Isotones
d
none of these
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32.
Which of the following is not used as a nuclear fuel cladding material?

a
Ceramics
b
Zircalloy
c
Cadmium
d
Stainless steel
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33.
The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be percent.

a
2.25
b
4.25
c
6.25
d
8.25
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34.
The Chernobyl nuclear disaster occurred in a power plant at Ukraine was in

a
April 1970
b
April 1979
c
April 1983
d
April 1986
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35.
moderator is used in a fast breeder reactor.

a
No
b
Graphite
c
Beryllium
d
Heavy water
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36.
Energy given to nucleus to dismantle it increases the

a
kinetic energy of individual nucleons
b
potential energy of individual nucleons
c
chemical energy of individual nucleons
d
mechanical energy of individual nucleons
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37.
Main source of is monazite sand.

a
uranium
b
hafnium
c
thorium
d
polonium
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38.
Fast breeder reactors are most usable in India, because of our largest deposits.

a
uranium
b
thorium
c
plutonium
d
none of these
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39.
Which of the following rays are more penetrating?

a
X-rays
b
Beta rays
c
Alpha rays
d
Gamma rays
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40.
The decrease in the atomic number is not observed in case of

a
a-emission
b
b-emission
c
electron capture
d
positron emission
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41.
Activity of one decay per second is equal to

a
1 Bq
b
1 Cd
c
1 atm
d
1 mol
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42.
Two atoms are said to be isotopes if -

a
They have the same atomic number but different mass numbers
b
They have the same number of neutrons but different mass numbers.
c
They have the same number of neutrons but different modes of radioactive decay.
d
The sum of the number of protons and neutrons is the same, but the number of protons is different.
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43.
Nuclear fusion reaction occurs in the

a
Sun
b
Stars
c
Hydrogen bomb
d
All of these
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44.
Thermal shield is used in high powered nuclear reactors to

a
absorb the fast neutrons.
b
slow down the secondary neutrons.
c
protect the walls of the reactor from radiation damage.
d
protect the fuel element from coming in contact with the coolant.
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45.
The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element?

a
A
b
Z
c
A+Z
d
A- Z
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