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PPSC Physics Full Book MCQs With Answers
Question # 1
What is the degree of magnetization of a material.
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Susceptibility
Ablitity
Retentivity
Capacity
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Question # 2
The resistance of a wire does not depend upon.
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Area of cross section of the wire
Length of the wire
Temperature of the wire
Current passing though the wire
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Question # 3
The angle of scattering for which the Compton shift is maximum is.
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0
o
45
o
80 o
180
o
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Question # 4
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 # 5
Beats occurs because of.
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Reflection
Refraction
Interference
Doppler's effect
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Question # 6
The law of gravitation was introduced by
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Huygen
Boyle
Newton
Pascal
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Question # 7
Which of the following quantity in analogous to temperature in electricity.
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Charge
Resistance
Inductances
Potential
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Question # 8
Which parameter determines the brightness of a light source sensed by an eye.
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Light energy entering the eye
Wavelength of light
Total radiant flux entering the eye
Total luminous flux entering the eye
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Question # 9
The condition of complete equilibrium is satisfied if.
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Vector sum of all the torques is zero
Vector sum of all the forces is zero
Vector sum of all the forces and torques is zero
Angular acceleration is zero
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Question # 10
The dimensions of universal gravitational constant G are.
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[MLT-2]
[ML -2T-2]
[M-1L2T-2]
[ML-1T-1]
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Question # 11
In the experiment of photo electric effect the minimum frequency of photons at which electrons are emitted from a metal surface is called.
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Critical frequency
Typical frequency
Threshold frequency
Surface frequency
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Question # 12
A heart coil is out into two equal parts and only one part is now used in the heater The heat generated will be.
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Halved
One fourth
Doubled
4 times
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Question # 13
The current passing through the switch s will be
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Zero
3 A
4.5 A
10 A
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Question # 14
A water wave is an example of
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Electromagnetic wave
Longitudinal wave
Transverse wave
Reverberation
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Question # 15
Which particle are not emitted by a radioactive substance.
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Alpha particles
Beta particles
Gama particles
Neutrons
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Question # 16
If an elevator is moving vertically up with an acceleration 'a' the force exerted on the floor by a passing of mass 'm' is
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Ma
Mg
M(g +a)
M (g-a)
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Question # 17
If in Young's double slit experiments the separation between two slits is halved then the fringe width
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Remains unchanged
Becomes double
Reduces to half
Becomes 3 times
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Question # 18
The ionization energy for hydrogen atom is
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-11.6 eV
-12.6 eV
-13.6 eV
-19.6 eV
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Question # 19
A shell explodes and many pieces fly off in different directions, which of the following is conserved.
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Momentum
K.E.
Momentum and K.E
Neither momentum nor K.E.
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Question # 20
If two non zero vectors are perpendicular to each other then their scalar product is equal to.
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-1
1
0
Infinity
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Question # 21
The magnitude of resultant of three forces is 3. Its x -component is 2 and y component is 1, then its z-component will be.
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1
2
3
4
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Question # 22
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 # 23
Choose the one which acts as single inverter.
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Common emitter
common collector
Common base
Diode
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Question # 24
The measure of how strongly a material oppose the flow of electrical current is known as
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Electrical resistivity
Specific electrical resistivity
Volume resistivity
All of the above
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Question # 25
A radiation spectrum which is continuously distributed over a frequency region without being broken up into lines or bands is known as.
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Continuous spectrum
Band spectrum
discrete spectra
Absorption spectrum
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Question # 26
Michelson used the equation to determine the speed of light.
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c = 4 fd
c = 8fd
c =12 fd
c = 18 fd
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Question # 27
Monochromatic ight is of single.
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Frequency
Wave length
Amplitude
Pitch
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Question # 28
If the pressure in a closed vessel is reduced by drawing some gas the mean free path of the gas molecules.
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Decreases
Remains constant
Increases
First increases then decreases
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Question # 29
When ever current is drawn from a cell Its terminal potential difference and emf become
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Different
Same
Zero
Negative
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Question # 30
Which property of waves is independent of the others.
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Amplitude
Velocity
Frequency
Wavelength
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Question # 31
For polarization , the direction of oscillation has to be perpendicular to the direction of travel sound waves are longitudinal waves so they cannot be.
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Reflected
Deflected
Diffracted
polarized
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