Physics mcq questions and answers for competitive exams

Posted : 4 months ago
Physics 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.
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?

a
Diffraction
b
Scattering
c
Polarization
d
Interference

2.
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

a
hysteresis loss alone
b
intense sunlight at noon
c
the heating effect of current alone
d
both the heating effect of current and hysteresis loss

3.
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

a
at sea level
b
at the top of Mt. Everest
c
at a place in a valley below sea level
d
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

4.
Lightning conductors are made up of

a
Iron
b
Steel
c
Copper
d
Aluminium

5.
On a rainy day, small oil films on water show brilliant colours. This is due to

a
diffraction
b
dispersion
c
polarization
d
interference

6.
It is easier to roll a barrel full of coal tar than to pull it because

a
the rolling friction is much less than the sliding friction
b
coal tar is a liquid and it flows in the barrel when it is rolled
c
the full weight of the barrel comes into play when it is pulled
d
more surface area of the barrel is in contact with the road when it is pulled

7.
If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?

a
Newton first law
b
Newton second law
c
Newton third law
d
Principle of conservation of linear momentum

8.
Planets do not twinkle because

a
they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
b
they are very far away from the earth resulting in decrease in intensity of light
c
their distance from the earth does not change with time
d
they emit light of a constant intensity

9.
On a cold day when a room temperature is 15◦C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15◦C, because

a
metals are good conductor of heat
b
plastics have a lower density than metals
c
metals have higher thermal capacity than plastics
d
plastics have a higher thermal conductivity than metals

10.
At what temperature a body will not radiate any heat energy?

a
0◦C
b
100◦C
c
273◦C
d
-273◦C

11.
Parsec is a unit of

a
Time
b
Energy
c
Pressure
d
Astronomical distance

12.
Planets are

a
non-luminous heavenly bodies
b
luminous heavenly bodies that twinkle
c
luminous heavenly bodies that do not twinkle
d
luminous heavenly bodies revolving around a star

13.
Which law states, ' The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature ' .

a
Stefan's Law
b
Doppler's Effect
c
Kirchhoff's Law
d
Newton's law of cooling

14.
Light from the Sun reaches us in nearly

a
2 minutes
b
4 minutes
c
8 minutes
d
16 minutes

15.
Electric Motor converts

a
Electrical energy into light energy
b
Mechanical energy into Electrical energy
c
Electrical energy into mechanical energy
d
None of above

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Physics mcq questions and answers for competitive exams

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