Nuclear Science mcq questions and answers for competitive exams

Posted : 4 months ago
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
1.
The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be of its original weight.

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

2.
One 'amu' is equivalent to

a
931J
b
931 eV
c
9.31 MeV
d
931 Mev

3.
Which is a fertile nuclear fuel?

a
U-233
b
U-235
c
Pu-239
d
Th-232

4.
The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about metres/second.

a
1100
b
2200
c
3300
d
4400

5.
Atoms of U-238 and U-235 differ in structure by three

a
protons
b
electrons
c
neutrons
d
electrons and three protons

6.
What is the wavelength of visible spectrum?

a
1300 - 3000 angstrom
b
3900 - 7600 angstrom
c
7800 - 8000 angstrom
d
8500 - 9800 angstrom

7.
If energy is released from a system, it's mass

a
zero
b
constant
c
increases
d
decreases

8.
Atoms with same number of neutrons, but different number of nucleons are called

a
isoters
b
isobars
c
isotopes
d
isotones

9.
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life per

a
3/4th of it will disintegrate in two months.
b
it will completely disintegrate in four months.
c
it will completely disintegrate in two months.
d
l/8th of it will remain intact at the end of four months.

10.
Atoms of an element differ from those of all other elements in

a
Atomic number and electronic configuration
b
Atomic number and number of valence electrons
c
Number of neutrons and electronic con- figuration
d
Number of neutrons and number of valence electrons

11.
In gamma emission, change in nucleon number is

a
zero
b
definite
c
increase by 1
d
decreases by 1

12.
A moderator the neutrons.

a
absorbs
b
reflects
c
slows down
d
accelerates

13.
Nuclear power is thermal power.

a
Cheaper than
b
Costlier than
c
Equal in amount
d
They cannot be related

14.
Heat is generated in a nuclear reactor (thermal) by

a
fusion of atoms of uranium.
b
fission of U-235 by neutrons.
c
absorption of neutrons in uranium atoms.
d
combustion of a nuclear fuel(e)g. uranium.

15.
Coolant present in the primary circuit of a pressurised water reactor is high pressure

a
saturated steam
b
saturated water
c
sub cooled water
d
superheated steam

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Nuclear Science mcq questions and answers for competitive exams

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