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PPSC Physics Full Book MCQs With Answers
Question # 1
In open circuit electromotive force equal to
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Current
Resistance
Voltage
Inductence
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Question # 2
When the deforming force applied on a body produces change in shape, thenit is said t be
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Tensile stress
Compression stress
Shear stress
Shear modulus
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Question # 3
Push pull amplifiers employ
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One transistor
Two transistors
Three transistors
Four transistors
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Question # 4
The diffraction of light was discovered by
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Newton
Young
Francesco Grimaldi
Hertz
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Question # 5
Negative feedback
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Increases stability
Decreases stability
Produces oscillatory
Cannot occur
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Question # 6
To measure the accurate value of potential difference across two points, the voltmeter should have.
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Zero resistance
small resistance
Large resistance
Infinite resitance
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Question # 7
One of the device to produce plane polarized light is.
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A prism
A bi prism
A plane mirror
A nicol prism
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Question # 8
Magnetic effect of current was discovered by
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Faraday
Fleming
Oersted
Ampere
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Question # 9
The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.
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The efficiency of the working substance of the engine
the ideal gas scale of temperature
The ratio of the absolute temperature of the reservoirs
The thermal capacity of the working substance
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Question # 10
Max. Planck was awarded Nobel prize in.
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1916
1918
1921
1923
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Question # 11
An ice making machine extracts energy at the rate of 500 W The specific latent heat of fusion of ice is 300 kj kg-1. How long does it take to freeze 2 kg of water at 0 oC.
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120 s
150 s
1200 s
1500 s
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Question # 12
What is the basic advantage of class A operation of an amplifier.
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It has high efficiency
It has high gain
It has low distortion
It has high distortion
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Question # 13
Mean free path in a gas is the
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Distance travelled by a molecule before hitting a wall
Average distance travelled by a molecule in one second
Average distance travelled between molecules between any two successive collisions
Root mean square velocity
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Question # 14
A transformer is used to.
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Convert D.C. into A.C.
Convert A.C. in to D.C.
Obtain A.C. voltage
Enhance the power
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Question # 15
How does viscosity affect relative motion between the liquid layers.
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Does not affect
Accelerates
May accelerate of retard
Retards
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Question # 16
Ultrasonic sound waves
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Can be heard by a normal human ear
Can be heard with the help of hearing apparatus
Can be heard with the help of microphone
cannot be heard
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Question # 17
A resistor connected to a battery is heated due to current passing through it. Which of the following quantity does not change.
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Resistivity
Resistance
Number of free electrons
Drift velocity
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Question # 18
When a wire moves perpendicularly to a magnetic field, the induced emf does ot depends upon
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The velocity of the wire
The resistance of the wire
The flux density of the magnetic
The orientation of the wire field
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Question # 19
Sounds of frequencies higher than 20,000 Hz are called.
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Super sonics
Infrasonic
Ultrasounds
Audible sound waves
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Question # 20
When ever a system is made to complete a cyclic process the work done during the complete cycle.
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Is zero
Is negative
Is positive
Depends upon the path followed
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Question # 21
The maximum number of rays required by a lens to form an image are
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2
3
4
Infinite
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Question # 22
Interference effects of light were verified by
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Thomas Young
Newton
Bragg
Huygen
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Question # 23
Which experiment is a demonstration that matter and energy can display properties of both waves and particles.
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young's double slit experiment
Division germier experiment
Heisenberg's uncertainty experiment
Stern Gerlach experiment
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Question # 24
In order to har an echo what is the minimum distance between the sound and reflecting surface.
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0.65 m
16.5 m
1.65 m
165 m
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Question # 25
A capacitor is connected to a battery The fore of attraction between the plate when the separation between them is halved will
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Remain the same
Become twice
Become 4 times
Become 8 times
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Question # 26
Which quantity decay exponentially when a capacitors is discharged.
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Charge only
Charge and voltage only
Charge and current only
Charge voltage and current
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Question # 27
A point source of light is situated at large distance The nature of the wave front at the point will be.
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Cylindrical
Spherical
Plane
Ellipical
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Question # 28
In compound microscope, image formed by the eyepiece is
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Real
Invented
Erect
Diminished
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Question # 29
What is the triple point of water.
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273 .15 K
0 K
100 K
0 oC
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Question # 30
The term used for the emission of electrons when light strikes a surface.
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The zeeman effect
The photo electric effect
Skin effect
Compton effect
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Question # 31
The index of refraction depends on
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the focal length
The speed of light
The image distance
The object distance
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