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Physics mcq questions and answers for competitive exams

Ramya_naidu

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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
16.
If lift is going up with acceleration, the apparent weight of a body is

a
equal to the true weight
b
less than the true weight
c
more than the true weight
d
may be more or less than true weight
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17.
On a stationary sail boat, air is blown from a fan attached to the boat. The boat

a
spins around
b
does not move
c
moves in the same direction in which air blows
d
moves in opposite direction in which the air is blown
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18.
Nuclear sizes are expressed in a unit named

a
tesla
b
fermi
c
newton
d
angstrom
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19.
Stars twinkle because

a
the intensity of light emitted by them changes with time
b
the distance of the stars from the earth changes with time
c
the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
d
the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
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20.
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

a
4.2 seconds
b
42 seconds
c
4.2 years
d
42 years
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21.
What is newton third law of motion?

a
Every body maintains its initial state rest or motion unless no external force is applied
b
The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force
c
To every action there is equal and opposite reaction
d
None of above.
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22.
Electromagnetic spectrum consists of the following radiations I. X-rays II. Gamma rays III. Ultraviolet radiations .Choose the correct order of code in the increasing order of their frequency:

a
I, III, II, IV
b
II, I, III, IV
c
IV, II, III, I
d
IV, III, I, II
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23.
Isotopes of an element contain

a
equal number of nucleons
b
equal number of protons and electrons
c
the same number of protons but different number of neutrons
d
the same number of neutrons but different number of protons
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24.
Moment of inertia is

a
vector
b
scalar
c
tensor
d
phasor
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25.
What is Hooke's Law?

a
Stress is directly proportional to strain
b
Stress is inversely proportional to strain
c
Stress and strain are dependent on each other
d
Stress and strain are independent of each other
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26.
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

a
Impulse and moment of force
b
Pressure and Young's modules
c
Planck's constant and Angular momentum
d
Force and rate of change of linear momentum
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27.
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

a
Iron, air and water
b
Air, water and iron
c
Iron, water and air
d
Water, iron and air
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28.
Light from the laser is

a
Incoherent
b
Composite
c
Dispersed light
d
Monochromatic
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29.
RADAR is used for

a
locating geostationary satellites
b
locating submerged submarines
c
receiving a signals in a radio receiver
d
detecting and locating the position of objects such as aeroplanes
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30.
What is the maximum value of deforming force upto which a material shows elastic property and above which the material loses it?

a
Stress
b
Strain
c
Elasticity
d
Elastic Limit
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