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PPSC Physics Full Book MCQs With Answers
Question # 1
LED is a p-n junction that emits
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Visible light
X- rays
Ultraviolet light
electromagnetic waves
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Question # 2
Which quantity has different base units from the other three.
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Density x volume x velocity
Rate of change of momentum
The Young's modulus x area
Weight
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Question # 3
Resistance and resistivity of a substance
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Increase with rise in temperature
Decrease with rise in temperature
Remains same at every temperature
Increases at high voltage
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Question # 4
If the earth stopped rotating the weight of the object at the equator would.
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Be greater
Be same as before
Be less
Very with altitude
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Question # 5
The diffraction of light was discovered by
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Newton
Young
Francesco Grimaldi
Hertz
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Question # 6
When a positive charge is allowed to move from positive to negative plate, then it will gain
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P.E.
K.E
Gravitational energy
Electrical P.E.
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Question # 7
The escape velocity from the earth's surface is
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1.2 km s-1
1.7 km s-1
10.2 km s-1
11.2 km s-1
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Question # 8
What is zoom lens
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It is a lens having fixed focal length
It is a lens having variable focal length
It is a lens used in radii to telescope
All of the above
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Question # 9
The internal energy of monoatomic gas is.
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3/2 RT
Independent of temperature
In the form of K.E.
Partially kinetic and partially potential
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Question # 10
In a purely resistive circuit carrying A.C. current the.
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Current and voltage are always in phase
Current lags the voltage by 1/4 cycle
Voltage lags the current by 1/4 cycle
Current leads the voltage by 1/2 cycle
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Question # 11
When an arrow is shot from a bow, it has K.E. which is given to it by
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The elongated tail
The stretched string of bow
The throw of archer
The sharp arrows head
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Question # 12
When a hot liquid is mixed with a cold liquid temperature of the mixture.
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First decreases and then becomes constant
First increases and then becomes constant
Continuously decreaes
Is undefined for some time and then nearly becomes constant
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Question # 13
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 # 14
X-rays can cause
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Malaria
Dysentery
Cancer
Blood pressure
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Question # 15
In CC configuration voltage gain is.
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Less than one
More than one
One
Zero
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Question # 16
when a body accelerates.
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Its direction always changes
Its mass always changes
Its velocity always changes
It falls towards the earth
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Question # 17
The temperature scale based upon triple point of water was given by
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Rumford
Carnot
Kelvin
Celsius
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Question # 18
A wave source of frequency 1,000 Hz emits waves of wavelength 0.1 m How long does it take for the waves to travel 2500 m.
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4 s
25 s
40 s
100 s
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Question # 19
Abu abdullah ibn Jabir Al battani was the greatest
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Philospher
Mathematician
Astronomer
Palmist
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Question # 20
Which quantity is common for systems in thermal equilibrium.
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Heat
Temperature
Momentum
Specific heat
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Question # 21
Which one of the following is an example of a reversible process.
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Work done against friction
Heat produced by current
Melting of ice
See back effect
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Question # 22
Liquids with disordered structure frozen in are an example of
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Amorphous solids
Glassy solids
Crystalline solids
Polymeric molecules
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Question # 23
What is world's average surface air temperature.
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5
o
C
10
o
C
15
o
C
20
o
C
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Question # 24
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 # 25
Which of the following is a set of supplementary units.
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Radian and steradian
Radian and mole
Steradian and candela
Radian and kelvin
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Question # 26
The graph between restoring force and time in SHM is a
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Straight line
Parabola
Sine wave
Circle
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Question # 27
The decimal equivalent of 1111 is
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5
10
15
120
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Question # 28
Which law states that the angle of incidence equals the angle of refraction.
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Law of reflection
Law of refraction
Snell's law
Hygens's principle
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Question # 29
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 # 30
Thermocouple is used for
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Converting atomic energy into heat energy
Measure the radiant energy
Storing the heat energy
Measuring current
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Question # 31
Ashes from a campfire deep in a cave show carbon -14 activity of only one eighth the activity of fresh wood. How long ago was that campfire made.
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13590 years
15190 years
17190 years
21190 years
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