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PPSC Physics Full Book MCQs With Answers
Question # 1
The nib of fountain pan is split of convey ink down the nib by the phenomenon of.
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Adhesion
Cohesion
Osmosis
Capillary
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Question # 2
Since a diode permits the flow of current only in one direction so it can be used as.
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An oscillator
A rectifier
A phot deflector
A transistor
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Question # 3
As a positively charged rod is brought closer and closer to a positively charged electroscope the gold leaf.
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diverges
Converges
is neutralized
Is unaffected
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Question # 4
As a result of modulation, the resultant wave is called.
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Carrier wave
Modulated carrier wave
Matter wave
Energetic carrier wave
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Question # 5
Which of the following devoices are used for measuring temperature.
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Thermocouples
Thermistors
Thermometers
All of these
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Question # 6
Huygen's concept of secondary waves.
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Allow us to find the focal length of a thick lens
Is a geometrical method to find a wave front.
Is used to determine the velocity of light
Is used to explain polarization
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Question # 7
the depth of a pond is 4 m What is the apparent depth of the pond if the water level is 3.5 m high. The refractive index of water is 1.33
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1.9 m
2.3 m
3.13 m
4.5 m
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Question # 8
The typical value of forbidden energy gap in germinium is.
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0.7 eV
1.0 eV
1.4 eV
10 eV
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Question # 9
A constant mass undergoes uniform acceleration the correct statement about the resultant force acting on the mass is.
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It increases uniformly w.r.t time
It is constant but not zero
It is proportional to the displacement from a fixed point
It is proportional to the verlocity
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Question # 10
No current flows between two charged bodies when connected if they have same.
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Charge
Capacity
Potential
Shape
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Question # 11
If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is
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5 A
10 A
12 A
15 A
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Question # 12
Photo diodes are used as
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Optical fibre receivers
Automatic switching
Logic circuits
All of the above
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Question # 13
The permeability of air is
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0.5
zero
infinity
Unity
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Question # 14
Which of the following is SI base unit for temperature.
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Celsius
Kelvin
Fahrenheit
Rankine
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Question # 15
Which of the following is heat transfer by means of the emission or absorption of electromagnetic radiation such as sunshine.
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Conduction or diffusion
Convection
Radiation
Mass transfer
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Question # 16
In optics, which subfield studies the measurement of electromagnetic radiation including visible light.
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Radiometry
Photometry
Telemetry
Chronometry
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Question # 17
The special theory of relativity was presented by
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Albert Einstein
Newton
Maxwell
Planck
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Question # 18
The resistance offered by one cubic meter of a substance is known as.
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Reactance
Conductance
Conductivity
Resistivity
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Question # 19
Which of the following quantities is not changed during refraction of light.
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Its direction
Its speed
Its frequency
Its wavelength
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Question # 20
The work required to lift a ball of mass 'm' from the surface of the earth to an infinite distance is
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Absolute P.E. of the body
P.E of the body
K.E. of the body
Chemical energy of the body
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Question # 21
The maximum K.E. with which photoelectrons are emitted depends very strongly on the.
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Intensity of incident light
Electric field near the photocathode
Frequency of incident light
Polarization of incident light
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Question # 22
What is the properly of materials that responds at an atomic or subatomic level to an applied magnetic field.
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Magnetism
electroplating
Diamagnetism
Electrolysis
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Question # 23
Lenz's was a physicist of.
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America
Russia
Japan
China
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Question # 24
The mechanical equivalent of heat is.
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Physical quantity
Constant
Conversion factor
Zero
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Question # 25
The magnetic induction is also called the
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Magnetic intensity
Magnetic flux
Magnetic flux density
Magnetic magnetization
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Question # 26
A spring of force constant k is out into three equal pats. The force constant of earth part will b e.
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k
3 k
k/3
k/2
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Question # 27
Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.
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20 minutes
40 minutes
80 minutes
120 minutes
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Question # 28
The speed of the charging or discharging a capacitor depends upon the product of resistance and.
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Current
Voltage
Capacitance
Potential difference
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Question # 29
48 days after the receipt the amount of iodine -131 left behind is only.
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0.1325 g
0.2135 g
0.3125 g
0.1235 g
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Question # 30
In Compton's effect the change in wavelength of a scattered photon is called.
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Angle of emergence
Angle of refraction
Angle of deviation
Compton shift
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Question # 31
In annitilation of matter, positron and electron pair disappears into two
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Alpha particles
Beta particles
Game particles
X-rays
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