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PPSC Physics Full Book MCQs With Answers
Question # 1
The rate of change of momentum of a body falling under gravity is equal to its.
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P.E.
K.E
Weight
Density
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Question # 2
Which of the following is not a ferromagnetic materials.
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Iron
steel
Copper
Cobalt
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Question # 3
In the equation P = IV cos Theta Cos theta is known as
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Phase angle
Liming angle
Phase
Power factor
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Question # 4
A force applied at centre of mass of a body
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Does not produce any torque
Produces torque
Produces acceleration
Produce couple
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Question # 5
The first successful quantitative theory of atomic structure was formulate by
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David Bohm
Louis de Broglie
Neil Bohr
J Jj. Thomson
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Question # 6
The inductance in a coil plays the same role as
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Inertia plays in machans
torque plays in machines
Energy plays in machines
Momentum plays in machines
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Question # 7
The critical angle will be maximum when light travels from
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Glass of air
Water to air
Water to glass
Glass to water
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Question # 8
A pendulum vibrates with a time period of 1 s which range of sound is produced by it
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Audible
Infrasonic
Ultrasonci
Super sonic
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Question # 9
The rms value of emf in a circuit is given by a factor of.
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0.637
0.7
0.707
1.11
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Question # 10
A stone is whirled in a vertical circle at the and of a string when the stone is at the highest position, tension in the string is
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Maximum
Zero
Equal to weight of the stone
Less than weight of the stone.
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Question # 11
The resultant of two force 3 N and 4 N making an angle 90
o
with each other is.
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1 N
3 N
5 N
10 N
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Question # 12
The discovery of interference of light was made possible in.
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1801
1901
1825
1925
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Question # 13
Hearing damage is possible at sound pressure of
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0 dB
50 dB
130 dB
195 dB
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Question # 14
Which one of the following represents an ohm.
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Volt per ampere
Joule per second
Watt per ampere
Joule per coulomb
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Question # 15
The first artificially produced nuclear transmutation was accomplished by.
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Curie
Rutherford
Becquerel
Chadwick
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Question # 16
The number 0.02 x 10
-8
in standard form will be written as.
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2 x 10
-10
2 x 10
-8
20 x 10
-8
20 x 10
-6
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Question # 17
Sound wave in air are
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Longitudinal waves
Transvers waves
Electromagnetic waves
Matter waves
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Question # 18
Alpha particles emitted from a radioactive material are.
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He nucliei
H -nucliei
Li nucliei
B nucliei
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Question # 19
What is the relativistic version of the Schrodinger equation.
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Klein Gordon equation
Laplace equation
Quadratic equation
Binomial equation.
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Question # 20
The smooth and steady streamline flow is known as
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Turbulent flow
Laminar flow
Regular flow
Irregular flow
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Question # 21
When a ray of light enters from rarer medium to a denser medium its wavelength.
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Increases
Decreases
Remain constant
Vanishes
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Question # 22
Which of the following can be used visualize the third law thermodynamics
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Light
Heat
Water
All of these
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Question # 23
The first super conductor was discovered by
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Faraday
Lenz
Kamaerlingh Ornes
Oersted
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Question # 24
In gases, the charge carriers are.
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Atoms
Molecules
Electrons only
Ions and electrons
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Question # 25
Which of the following medium can transmit both transverse and longitudinal waves.
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Solid
Gas
Liquid
Plasma
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Question # 26
The steady current which produces the same heating effect in a resistance in a given time as the alternating current does in the same resistance in the same time is called.
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Induced current
Root mean square value of an alternating current
Mean value of alternating current
Electromotive force
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Question # 27
The maximum field that a dielectric material can with stand whiteout breaking down is called its.
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Di electric strength
Magnetic strength
Capacity
Resistance
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Question # 28
Light from the sun reaches the earth in
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Spherical wave fronts
Cylindrical wave fronts
Plane wave fronts
Packets
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Question # 29
An oscillator is basically an amplifier with loop gain
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Zero
Less than unity
More than unity
Infinity
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Question # 30
The part of theory of relativity which deals with accelerated bodies is called.
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special theory of relativity
General theory of relativity
Lorentz's theory of relativity
Galilean theory of relativity
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Question # 31
Express the quantity 225 x 10
-6
s using prefixes.
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0.225 micro second
2.25 micro second
225 micro second
2,25 neno second
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