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PPSC Physics Full Book MCQs With Answers
Question # 1
Half life and mean lifetime of a radioactive element are.
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Equal to each other
Inversely proportional to each other
Directly proportional to each other
Not related to each other
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Question # 2
Electromagnetic wave theory was proposed by
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Maxwell
Hertz
Fizeace
Huygen
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Question # 3
Photo diodes are used as
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Optical fibre receivers
Automatic switching
Logic circuits
All of the above
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Question # 4
What is a measure of the separation of positive and negative electrical charges in a system of charges.
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charge polarization
Electric dipole moment
Electric field
Electrostatic induction
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Question # 5
The process of mixing sound waves with carrier waves is known as.
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Rectification
amplification
Modulation
Demodulation
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Question # 6
If gravitational field is not uniform over the extended object or system of point masses the centre of mass and centreof gravity will
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Be antiparallel
Not coincide
Coincide
Be perpendicular
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Question # 7
Spherical aberration can be removed by using
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Concave lens
Convex lens
By limiting the number of rays using a stopper
By using a concave convex lens
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Question # 8
The phenomenon in which a charging current in one coil induces an emf in another coil is called.
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Induced current
Induced emf
Self induction
Mutual induction
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Question # 9
If we double both the current and the voltage in circuit while keeping its resistance constant the power.
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Remains unchanged
Halves
Doubles
quadruples
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Question # 10
Acceleration due to gravity is not affected by which one of the following
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Latitude
Attitude
Longitude
Depth
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Question # 11
Which of the following has teh maximum permeability.
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Paramagnetic substances
Ferromagnetic substances
Diamagnetic substances
Iron oxide
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Question # 12
In n-p-n transistor the current flows in the direction from
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Emitter to base
emitter to collector
Base to emitter
Base to collector
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Question # 13
Transistor stands for
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Transfer of resistance
Transfer of current
Transfer of power
Transfer of voltage
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Question # 14
The internal resistance of a primary cell depends upon the.
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Current dawn form the cell
Concentration of the solution
distance between cell electrodes
All of the above
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Question # 15
According to kinetic theory of gases one assumes that the collisions between molecules are.
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Perfectly elastic
Perfectly inelastic
Partly elastic
Partly inelastic
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Question # 16
If a conductor sun infirmly stretched so that its length is increased in timed, then its resistance becomes.
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n times the original resistance
1/n times the original resistance
n2 times the original resistance
n3 times the original resistance
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Question # 17
The amplitude of a vibrating body at resonance place in vacuum is.
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zero
Maximum
Minimum
Infinite
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Question # 18
The decimal equivalent of 1111 is
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5
10
15
120
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Question # 19
Power of lens is measured in
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cm
Metres
cm-1
Dioptres
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Question # 20
A man in an elevator descending with an acceleration will conclude that his weight has
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Increased
Decreased
Constant value
Zero value
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Question # 21
When the battery is being charged its terminal potential difference than its emf is.
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Less
Greater
Double
Squared root
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Question # 22
Which one of the following pairs does not have the same dimensions.
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Force and weigfht
Pressure and stress
Capacitance and resistance
Energy and work
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Question # 23
Light travels perpendicular to electric and magnetic fields and requires no material medium, was proposed by.
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Einstein
Max planck
Maxwell
Bragg
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Question # 24
The molecular weight of D2O is
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16
18
20
24
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Question # 25
If a liquid does not wet a solid surface, the angle of contact is.
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Less than 90
o
Greeter than 180
o
90
o
Between 90
o
and 180
o
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Question # 26
The main causes of power losses in a generator are.
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Pulsatng current
Eddy current
Magnetic current
Both B and C
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Question # 27
What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A.
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4.8 W
14.5 W
30 W
60 W
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Question # 28
Which factor remains constant in a transformer.
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Current
Voltage
Power
Frequency
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Question # 29
Charge to mass ration of an electron is determined by using the relation.
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e/m = B/rv
e/m = r/vB
e/m = V/Br
e/m = v/r
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Question # 30
Chromatic aberration can be removed by using.
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Convex lens
Two convex lenses
Concave lens
Combination of a convex lens and a concave lens
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Question # 31
Which of the following factor will not affect the speed of sound i a medium.
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Temperature
Pressure
Humidity
Mass
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