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PPSC Physics Full Book MCQs With Answers
Question # 1
The specific heat of liquid
Choose an answer
Decreases with temperature
Increases with temperature
Remains constant with change in temperature
Increases with pressure
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Question # 2
When a ray of light enters a glass slab from air
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Its frequency increases
Its wavelength increases
Neither frequency nor wavelength change
Its wavelength decreases
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Question # 3
The shape of wave front depends on
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Density of medium
Shape of medium
Viscosity of medium
Length of medium
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Question # 4
A wire surrounded by a concentric cylindrical metal shield constitutes a.
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Spherical capacitor
Parallel plate capacitor
Cylindrical capacitor
Cylindrical condenser
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Question # 5
Marie Curie and Pierre Curie discovered two new radioactive elements which are.
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Uranium and radkum
Platinum and radium
Polonium and radium
Crypton and radon
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Question # 6
In the Geiger Marsden experiment a narrow beam of alpha particles was fired at a thin piece of Gold foil in a vacuum Some of the particles were scattered though large angles The result of the experiment provided evidence for the existence of.
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A very small charged nucleus
electrons orbiting the nucleus
Neutrons in the nucleus
Nuclear reaction
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Question # 7
What does a dynamo generate
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Electrons
Emf
anion
Cation
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Question # 8
In a compound microscope objective lens acts as a projector and eye place as a
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Compensator
Erecting lens
Simple microscope lens
Turntable
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Question # 9
Which of the following wavelength lies in X-rays region.
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1 A
100 A
1,000 A
10,000 A
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Question # 10
A heat sensitive resistor is called.
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Thermistor
Varibale resistor
Fixed resistor
Zero resistor
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Question # 11
If we use two diodes and a centre tapped transformer we will get.
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A transistor
An amplifier
A half wave rectifier
A full wave rectifier
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Question # 12
Who introduced the concept that an atom possesses quantized energy levels.
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Fermi
Newton
Bohr
Einstein
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Question # 13
In the experiment of production of X rays electrons are accelerated towards the anode by
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Thermionic emission
Potential difference
Breaking potential
Cut of current
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Question # 14
The ability of eye to focus near as well as distant object is termed as.
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Myopia
Persistence of vision
Power of accommodation
Astigmatism
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Question # 15
Planets move around the sun due to.
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Centrifugal force
Centripetal force
Gravitational pull between them
Frictional force between them
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Question # 16
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 # 17
The electric supply line in houses works at 220 V what will be the amplitude of emf.
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120 V
331 V
220 V
440 V
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Question # 18
The maximum displacement from the undisturbed position of the medium to the crest top is called.
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Wavelength
Amplitude
Period
Frequency
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Question # 19
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 # 20
The same notes being played on sitar and veena differ in.
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Pitch
Quality
Both quality and pitch
Neither quality nor pitch
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Question # 21
The capture of neutron by a proton results in the formation of.
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Deuteron and gama rays
Deuteron and alpha particle
Triton and Beta particles
Tritron and X rays
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Question # 22
The magnitude of the resultant of two equal forces is equal to either to the force What is the angle between the two forces
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0
o
120
o
60
o
180
o
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Question # 23
The polarization of an electromagnetic wave is determined by
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The magnetic field
The electric field
The electric and magnetic fields
The field direction of propagation of electromagnetic waves
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Question # 24
Which type of solid have definite melting point.
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Crystalline solids
Amorphous solids
Glassy solids
Polycrystalline solids
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Question # 25
Two lenses of focal length 'f' are combined the resultant focal length is
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f
2f
f/2
zero
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Question # 26
Which of the following are defects is lenses.
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Chromatic aberration
Spherical aberration
Astigmation
All of the above
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Question # 27
The electrons behave as waves, because they can .
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Produce ions in gases
Diffracted by a crystal
Be deflected by electric fields
Be deflected by magnetic fields
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Question # 28
Because of second law of thermodynamics about the direction of energy flow what is possible.
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Heat
Light
Energy
life
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Question # 29
Which of the following is not an electromagnetic wave.
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game rays
Ultraviolet rays
Ultrasonic waves
Microwaves
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Question # 30
Two charged spheres are separated by 2 mm Which of the following would produce the greatest attractive force.
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+1 q and + 4 q
-1 q and -4 q
+2 q and +2 q
+2 q and -2q
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Question # 31
The maximum energy of photons emitted from ab X rays tube is certain to be increased by
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Increasing the voltage across the tube
Decreasing the voltage across the tube
Heating the metal target
Putting a barrier in the way of photons
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