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PPSC Physics Full Book MCQs With Answers
Question # 1
The specific heat of liquid
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Decreases with temperature
Increases with temperature
Remains constant with change in temperature
Increases with pressure
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Question # 2
When a platinum wire is heated of 1600
o
C, it becomes
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orange
Cherry red
Dull red
White
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Question # 3
Mosley's law establishes the x rays fluorescence's of target element with its.
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Atomic weight
Atomic number
Density
Lattice constant
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Question # 4
The index of refraction for a substance is
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Constant
Constant for a given wavelwngth
Variable with the speed of light
Never constant
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Question # 5
Candela is the SI base unit of.
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illuminance
Luminous flux
Luminous intensity
Radiant energy
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Question # 6
The emission of Beta particle from protonium -218 results in the formation of.
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Protactinium -231
Thorium -232
Astatine -218
Radon -222
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Question # 7
Fringe spacing in double slit experiment can be increased by decreasing.
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Wavelength of light
Width of slits
Slite separation
Distance between the slits and screen
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Question # 8
Which of these is not a method of charging.
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Friction or rubbing
Induction
Contact or touching
Convection
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Question # 9
On reflection of light from a source there occurs a change in
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Wavelength
Velocity
Period
Frequency
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Question # 10
One Tesla is equal to.
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1 N A-1
1 N m-1
1 N A -1 m
1 N A -1 m-1
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Question # 11
The Compton effect in X-rays proves that
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Electrons have wave property
x-rays have wave properly
X-rays have particle characteristics
Electrons cannot exist
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Question # 12
What is the effect of electric and magnetic fields on X-rays
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X-rays are deflected
X-rays are not deflected
X-rays are sometimes deflected and sometimes not
Nothing can be said
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Question # 13
A force of 50 N acts on a body for 10 s the change in momentum will be.
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5 N s
200 Ns
500 Ns
800 N s
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Question # 14
Which circuit elements has two stable states and can be used to store information.
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Flip flop or latch
Logic gate
Oscillator
Amplifier
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Question # 15
The continuous X rays spectrum is due to an effect.
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Bremsstrahlung
Breaking radiation
Holography
both a and b
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Question # 16
Efficiency of a Carnot engine depends on
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Temperature
Pressure
Volume
The nature of working substance
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Question # 17
Fiber optics system can be used for.
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Word processing
Image processing and receiving
Image transmitting
All of the above
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Question # 18
If the transformer turns ratio is 2 and the impedance of primary coil is 250 Ohms then the impedance secondary coil will be.
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125 Ohms
250 Ohms
500 Ohms
1000 Ohms
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Question # 19
The SI unit of magnetic flux is.
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N A-1
N m-1 A
N m A-1
N m-1 A-1
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Question # 20
On what factor the internal energy of a thermodynamic system depend upon.
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History
State
Process
Surroundings
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Question # 21
At high temperature a body generally emits redactions of.
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Small wavelengths
Long wavelengths
Moderates wavelengths
Zero wavelengths
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Question # 22
If a force of 50 N is acting along x axis , then its component along y-axis will be.
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Zero
The same
Of the half magnitude
Of the double magnitude
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Question # 23
As electric field intensity is a potential gradient, if may be expressed ni the units of NC-1 or
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volt
Volt metre
Volt per metre
Joule
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Question # 24
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 # 25
The SI unit of magnetic flux is
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gauss
Maxwell
Oersted
Water
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Question # 26
The property of a material to return to it original shape and size on the removal of an external force is called.
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Stress
Strain
Toughness
Elasticity
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Question # 27
Which of the following proves that light waves are transverse in nature.
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Diffraction
Interference
Polarization
Refraction
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Question # 28
A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.
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Transvers wave
Longitudinal wave
Stationary wave
Shock wave
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Question # 29
To produce beats it is necessary to use two waves.
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Travelling in opposite direction
Of slightly different frequencies
Of equal wavelengths
Of equal amplitudes
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Question # 30
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 # 31
Generally, electrical resistivity of intrinsic semiconductors decreases with increasing.
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Pressure
Volume
Temperature
Density
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