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PPSC Physics Full Book MCQs With Answers
Question # 1
Huygen's wave theory falls to explain
Choose an answer
Diffraction
polarization
Interference
Refraction
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Question # 2
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 # 3
Which part of hole located in the centre of the eye that allows light to enter the retina.
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Iris
Pupil
Cornea
Fovea
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Question # 4
The ratio of the magnitude of charge on one of the two conductors in proximity to the potential difference between the two is called.
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Inductance
Reactance
Resistance
Capacitance
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Question # 5
Which mirror be used for obtaining a parallel beam of light from a small lamp.
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Plane mirror
Convex mirror
Concave mirror
All of these
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Question # 6
When a direct current is passed though a junction formed of two dissimilar metals the junction becomes warmer or cooler depending on the.
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Current direction
Thermocouple used
Temperature gradient
Amount of current
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Question # 7
Half life and mean lifetime of a radioactive element are.
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Equal to each other
Inversely proportional to each other
Directly proportional to each other
Not related to each other
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Question # 8
What is the power factors of wattles current.
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Infinity
Unity
0.5
Zero
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Question # 9
What is the triple point of water.
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273 .15 K
0 K
100 K
0 oC
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Question # 10
Rainbows and mirage are formed by
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Reflection only
Refraction only
dispersion only
A combination of refraction, total internal refraction and dispersion
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Question # 11
Which of the following should not change in isothermal operation.
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Heat constant
Volume
Pressure
Temperature
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Question # 12
A tin film of liquid is enclosed between two glass plates it is difficult to spates the plates on account of.
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Surface tension
Atmospheric pressure
Viscosity
Friction
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Question # 13
What is the smalless total resistance using only a 6 ohm and 12 ohm resistors.
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2 Ohm
3 Ohm
4 Ohm
6 Ohm
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Question # 14
Mosley's law establishes the x rays fluorescence's of target element with its.
Choose an answer
Atomic weight
Atomic number
Density
Lattice constant
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Question # 15
A gama ray of energy 1900 MeV is absorbed by
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Proton antiproton pair
Electron positron pair
Producing heat in the substance
The orbit
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Question # 16
In which one of the following states molecules do net leavt their position.
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Solid
Liquid
Gas
Plasma
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Question # 17
Two forces act together on an object the magnitude of their resultant force is minimum when they act at
Choose an answer
0
o
45
o
C
90
o
180
o
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Question # 18
The Rutherford atom according to classical theory is
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Stable
Unstable
Partially stable
Quantized
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Question # 19
Who wrote books on sound and music.
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Galileo
Alkundi
Alberuni
Ibn al Haithem
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Question # 20
In a charged capacitor the energy resides
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In the negative plate
In the positive plate
In the field between the plates
Around the edge of the plates
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Question # 21
The unit of magnetic induction is.
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weber -metre
weber -metre 2
weber-meter-2
weber-metre-1
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Question # 22
Sub atomic particles which experience strong nuclear force are.
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Leptons
Hadrons
Mesons
Quarks
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Question # 23
What is the direction of the magnetic field lines inside a bar magnet.
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From north pole to south pole
From south pole to north pole
From side to side
There are no magnetic field lines
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Question # 24
Which one of the following has the largest wavelength.
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x rays
Infrared rays
Visible light
Radio waves
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Question # 25
The characteristic of an image formed by a plane mirror is.
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It is of the same size as the object
It is laterally inverted
It is upright
All of the above
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Question # 26
Why freezer a refrigerator is located in the top section
Choose an answer
Motor is not affected
Heat gained from environment is less
The entire chamber of freezer is cooled quickly
Heat gained from environment is more
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Question # 27
The corss product of two vectors is zero when they
Choose an answer
Are parallel to each other
Are perpendicular to each other
Are at an angle of 120
o
Both are equal
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Question # 28
Two convex lens focal length 'f' use din combination become telescope. When the distance between them is.
Choose an answer
1
4f
2f
f/2
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Question # 29
When net force acting on a system is zero which of the following will be constant.
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Force
Linear momentum
Angular momentum
Linear impulse
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Question # 30
What is a measure of the total energy of a thermodynamics system.
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Entropy
Enthalpy
Randomness
Chaos theory
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Question # 31
A capacitor is prefect insulator for
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Direct current
Alternating current
Direct as well as alternating current
Pulsating current
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