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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
46.
Kilowatt - hour is a unit of

a
Power
b
Current
c
Energy
d
Electric charge
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47.
Which among the following order of decreasing wavelengths of electromagnetic waves is correct? I. Radio waves II. Infrared rays III. Visible Light IV. X-Rays

a
I, II, III, IV
b
I, III, II, IV
c
II, I, IV, III
d
IV, III, II, I
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48.
Mirage is due to

a
magnetic disturbances in the atmosphere
b
depletion of ozone layer in the atmosphere
c
equal heating of different parts of the atmosphere
d
unequal heating of different parts of the atmosphere
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49.
The maximum velocity upto which fluid motion is streamline is called

a
Viscous Force
b
Critical Velocity
c
Streamline Flow
d
Terminal Velocity
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50.
Magnetism at the centre of a bar magnet is

a
zero
b
minimum
c
maximum
d
minimum or maximum
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51.
Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from

a
east
b
west
c
northeast
d
southeast
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52.
Out of the following, which is not emitted by radioactive substance?

a
Electrons
b
Neutrons
c
Alpha particles
d
Electromagnetic radiations
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53.
Rainbow is due to

a
ionisation of water deposits
b
diffusion of sunlight through water droplets
c
absorption of sunlight in minute water droplets
d
refraction and reflection of sunlight by water droplets
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54.
Only one part of moon can be seen from earth because

a
The period of rotation and revolution are equal
b
Only one part reflects light
c
It does not rotate
d
None of these
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55.
Which metal is commonly used for making an electromagnet?

a
Iron
b
Nickel
c
Cobalt
d
Copper
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56.
Pick out the scalar quantity

a
force
b
velocity
c
pressure
d
acceleration
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57.
Galvanometer can be converted into a voltmeter by using

a
Low resistance in series
b
High resistance in series
c
Low resistance in parallel
d
High resistance in parallel
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58.
Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2

a
0.14 m/s
b
1.4 km/s
c
14 m/s
d
140 m/s
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59.
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?

a
Refraction
b
Internal reflection
c
Both (a) and (b)
d
Diffusion
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60.
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

a
work done in rolling is more than in lifting
b
work done in lifting the stone is equal to rolling it
c
work done in rolling a stone is less than in lifting it
d
work done in both is same but the rate of doing work is less in rolling
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