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PPSC Physics Full Book MCQs With Answers
Question # 1
When amplitude of a wave becomes double its energy becomes.
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Xero
Double
4 times
6 times
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Question # 2
The relation between the voltage and current that flows in a resistor is.
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V = 1/R
R = vi
V = I2 R
I = V /R
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Question # 3
If a gas does 10 J of external work white expanding then the change in internal energy is equal to.
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0 J
10 J
-10 J
100 J
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Question # 4
Who gave the idea of matter wave.
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De Broglie
Planck
Einstein
Huygen
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Question # 5
The energy transmitted per second though unit are held perpendicular to the direction of propagation of the wave is called.
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Intensity of sound
Pitch of sound
Loudness of sound
Quality of sound
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Question # 6
Transistors with various combinations are widely used as switches in.
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electric generators
Rectificers
Amplifiers
Computers
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Question # 7
If a charged body is moved against the electric field it will gain.
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P.E
K.E.
Electrical P.E.
Gravitational energy
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Question # 8
In a Nuclear reactor which material is often used as modeerator.
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Water
Graphite
Uranium
Water and graphite
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Question # 9
The weight of a man in an elevator moving down with an accelerating of 9.8 m s-2 will be come
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Half
Zero
9.8 N
Double
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Question # 10
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 # 11
Condenser is used
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To produce charge
To change the direction of current
To collect the charge
As a good conductor of electricity
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Question # 12
The chain reaction is controlled by a series of rods usually made of.
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uranium
Cadimium
Boron
Steel
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Question # 13
If a vehicle is to gain momentum it must
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Lose weight
Move slowly
Lose inertia
Accelerate
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Question # 14
The point of which an applied force produces a linear acceleration but no rotation is called.
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Centre of the body
Centre of the mass
Centre of gravity
Weight of the body
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Question # 15
Who was awarded Nobel Prize for fist artificial atomic transmutation.
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Yukawa
Rutherford
Chadwick
Becquerel
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Question # 16
The dioptre power of concave lens of 10 cm focal length is.
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0.1 dioptre
1.0 diopter
10 dioptre
-10 dioptre
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Question # 17
Who discovered a phenomenon of thermos electricity.
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Peltier
Joule
Seeback
thomson
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Question # 18
Who developed hypothetical heat engine that has the maximum possible efficiency in 1824
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Saadi carnot
August Otto
rudolf Diesel
Kari Benz
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Question # 19
Neither the position nor the momentum of a particle can be predicted with arbitrarily great precision is the statement of.
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Archimede's principle.
Heisenberg uncertainty principle
Mosley's law
Schrodinger's wave equation
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Question # 20
Which of the given geometries will result in the largest convection consfficient.
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Vertical plate
Diagonal plate
horizontal plate facing upwards
Horizontal plate facing downwards
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Question # 21
The focal length of a thin converging lens is 10 cm What is the maximum distance from the lens that the object can be placed so that the lens acts as a magnifying glass.
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5 cm
10 cm
15 cm
20 cm
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Question # 22
If a wave vibrates 10 times in one second with a speed of 10 m s-1 the wavelength will be.
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1 m
10 m
20 m
100 m
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Question # 23
Which type of image is produced by the converging lens of human eye if it views a distant object.
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Real, erect, same size
Real, inverted, diminished
Virtual, erect, diminshed
Virtual, inverted, magnified
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Question # 24
The magnetic force is simply a
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Reflecting force
Deflecting force
Restoring force
Gravitational force
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Question # 25
The SI unit of solid angle is
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Degree
Radian
Steradian
Candala
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Question # 26
Neil Bohr made his three postulates in.
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1897
1905
1913
1921
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Question # 27
The maximum energy of photons emitted from ab X rays tube is certain to be increased by
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Increasing the voltage across the tube
Decreasing the voltage across the tube
Heating the metal target
Putting a barrier in the way of photons
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Question # 28
A person suffering from short sighted ness uses
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Concave lens
Convex mirror
Convex lens
Concave mirror
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Question # 29
The advantage of electron tube over a transistor is.
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Its high efficiency
Its high gain
Low consumption of power
Low input impedance
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Question # 30
Difference in the density of two medium when waves are passing from one into another medium always results in the change in.
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Wave speed
Wave direction
Both speed and direction
Wave frquency
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Question # 31
Which of the following devices can be used to produce both transvers and longitudinal waves.
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A string
A ripple tank
a helical spring
A turning fork
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