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PPSC Physics Full Book MCQs With Answers
Question # 1
Where should be the centre of gravity of a body.
Choose an answer
It must be within the body
It must be outside the body
It may be near but not essentially within the body
It changes its position after sometime
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Question # 2
Which quantity provides a quantitative measure of disorder.
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Entropy
Enthalpy
Randomness
Chaos
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Question # 3
What will be the sound speed if the frequency is doubled.
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zero
Half
Double
Unchanged
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Question # 4
A person of height 1.5 m stands 2.0 m in front of a plane mirror How far from the person is her image .
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2.0 m
3.0 m
3.5 m
4.0 m
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Question # 5
If a single convex lens is placed closed to the eye then it can be used as
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Telescope
Simple microscope
Compound microscope
Opera glass
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Question # 6
Binding energy per nucleon is.
Choose an answer
Greatest for heavy nuclei
Least for heavy nuclei
Greatest for light nuclei
Greatest for medium weight nuclei
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Question # 7
The magnitude of the resultant of two equal forces is equal to either to the force What is the angle between the two forces
Choose an answer
0
o
120
o
60
o
180
o
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Question # 8
The amount of heat needed per unit mass to raise the temperature of a system one degree at constant pressure is numerically aqual to
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The specific heat
The specific thermal energy
The specific heat at constant pressure
the internal energy of the gas
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Question # 9
The force of friction that comes into action after the motion has started
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Static friction
Dynamic friction
Friction only
Limiting friction
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Question # 10
Which experiment confirmed the de Broglie hypothesis.
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Double slit experiment
Division germier experiment
Schrodinger's Cat experment
Bohr's experiment
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Question # 11
Efficiency of a Carnot engine depends on
Choose an answer
Temperature
Pressure
Volume
The nature of working substance
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Question # 12
The door of an operating refrigerator in a closed room is opened after sometime the temperature of the room will be
Choose an answer
Lowered
Raised
Unaffected
Become zero
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Question # 13
Which statement about convection is correct.
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Brownian motion is a form of convection
Convection occurs only in gas
Convection results from a density change
Evaporation is a form of convection
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Question # 14
When transistor works as an amplifier, its output is.
Choose an answer
More
Less
Zero
Directly proportional to the input
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Question # 15
The phenomenon of interference comes about because waves obey
Choose an answer
the impulse momentum theorem
An inverse square law of intensity
The principle of reciprocity
The principle of super position
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Question # 16
What happens to the intensity or the brightness of the lamps connected in series as more and more lamps are added.
Choose an answer
Increases
Decreases
Remains the same
Cannot be predicted
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Question # 17
The final image produced by a microscope is.
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Real and erect
Virtual and erect
Real and inverted
Virtual and inverted
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Question # 18
What is the emission of light by a substance that has observed light or others electromagnetic radiations of a difference wavelength.
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Fluorescence
Illuminance
Luminance
Incandescence
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Question # 19
A terrestrial telescope produces
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An react and real image
An inverted and real image
An inverted and virtual image
An erect and virtual image
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Question # 20
Reversible alternation of the form of dimensions of a solid body under stress and strain is called.
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elastic limit
Plastic limit
elestic deformation
Plastic deformation
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Question # 21
The work done in moving a body from one place to another in a gravitational field is independent of the
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applied force
Force of gravity
Path followed by the body
Force of earth
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Question # 22
The dimensions of universal gravitational constant G are.
Choose an answer
[MLT-2]
[ML -2T-2]
[M-1L2T-2]
[ML-1T-1]
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Question # 23
An electric lamp use energy at the rate of 46 W on a 12 V supply. How much charge passes through the lamp in 2s.
Choose an answer
0.15 C
0.50 C
2.0 C
8.0 C
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Question # 24
The band of colours is called.
Choose an answer
Spectrum
Prism
Medley
LASER
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Question # 25
Radio carbon in the atmosphere is produced by the bombardment of.
Choose an answer
Oxygen by high energy neutrons
Oxygen by high energy protons
Nitrogen by high energy protons
Nitrogen by high energy neutrons
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Question # 26
The ration Cv/Cp = y for a diatomic gas like air is
Choose an answer
1.29
1.30
1.40
1.67
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Question # 27
For which of the following objects is the centre of mass equidistant from every point on its surface
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An unsharpened pencil
A gramophone record
An egg
A table tennis ball
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Question # 28
The centre of gravity of an object is also called.
Choose an answer
Centre of buoyancy
Centre of mass
Centre of the body
Torque
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Question # 29
The velocity at which laminar flow changes to turbulent flow is called.
Choose an answer
Terminal velocity
Escape velocity
Critical velocity
Uniform velocity
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Question # 30
According to Huygen's principle
Choose an answer
Light bends round corners
Light travels in a straight line
All points on primary wave front are considered centre of distances
Light has wave nature
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Question # 31
Air bubble in water shines because of
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Reflection
Refraction
Diffraction
Total internal reflection
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