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PPSC Physics Full Book MCQs With Answers
Question # 1
Angular simple harmonic motion is.
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Periodic rectilinear motion
Independent of any applied torque
Periodic rotational motion
Never defined
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Question # 2
Conventionally antilock wise torque is taken as.
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Zero
Positive
Infinity
Negative
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Question # 3
The convincing evidence of the wave nature of electrons was provide by.
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Stefan
Rayleigh
Davision and Germer
Balmer
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Question # 4
Absolute P.E. of a body can be calculated
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At centre of the earth
Below centre of the earth
From surface of the earth
Below surface of the earth
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Question # 5
A Carnot engine has the same efficiency between (i) 100 K and 500 K and ii) T and 900 K What will be T.
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90 K
100 K
180 K
200 K
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Question # 6
The value of voltage or current that exists in a circuit at any instant of time measured from some reference point is its.
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Peak value
Peak to peak value
Instantaneous value
Average value
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Question # 7
The phenomenon of interference comes about because waves obey
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the impulse momentum theorem
An inverse square law of intensity
The principle of reciprocity
The principle of super position
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Question # 8
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 # 9
Since light rays are always diverged by concave lenses such lenses
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Cannot form images
Form only black and white images
From only invented image
Form only erect images
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Question # 10
Which are the following describe the study of static magnetic fields.
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Electrodynamics
Megnetostatic
Electrostatic
Paraamagnetism
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Question # 11
Crystalline solids are of.
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Short range order
Long range order
Intermediate range
Plastics
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Question # 12
The simple form of particle accelerator is.
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Cathode ray tube
Oscillator
Amplifier
Phase locked loop
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Question # 13
The coulomb's law is valid for the charges which are.
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Moving and point charges
Moving and non point charges
Stationary and point charges
Stationary and large size charges
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Question # 14
The photons emitted in inner shell transition are.
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Alpha particle
Beta particle
Gama particle
Characteristic X-rays
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Question # 15
Ohm's law is applicable to
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Ohmic and non ohmic devices only
Semiconductors only
Metals only
Insulators only
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Question # 16
A p-type material is formed then a semiconductor is doped with
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Trivalent impurity
Tetravalent impurity
All of above
A material having excess of free electrons
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Question # 17
Atomic reactor is based on
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Controlled chain reaction
Uncontrolledly chain reaction
Nuclear fission
Nuclear fusion
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Question # 18
If the resultant of two forces, each of magnitude F have the magnitude F, angle between the forces will be.
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30
o
80
o
90
o
120
o
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Question # 19
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 # 20
The number of molecules or atoms in a specific volume of a gas is independent of their
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Volume
Pressure
Size
Temperature
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Question # 21
The phenomenon of Brownian motion shows that
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Molecules exist and can be seen as bright dots moving about
Molecules moves about randomly at highs speeds
Smoke particles behaves as molecules
Smoke particles can be used as models of air molecues.
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Question # 22
An operational amplifier can be used as a
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Comparator
Night switch
Inverting and non inverting amplifier
All of the above
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Question # 23
The first super conductor was discovered by
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Faraday
Lenz
Kamaerlingh Ornes
Oersted
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Question # 24
The angular frequency time period and frequency in SHM not depend upon.
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Mass
Force constant
Amplitude
Restoring force
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Question # 25
When the source and observer are moving away from each other the apparent pitch will
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Increases
Decreases
Be zero
Be infinite
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Question # 26
Which particle has zero charge and zero rest mass.
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Neutron
Proton
Electron
Photon
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Question # 27
Hearing damage is possible at sound pressure of
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0 dB
50 dB
130 dB
195 dB
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Question # 28
The main causes of power losses in a generator are.
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Pulsatng current
Eddy current
Magnetic current
Both B and C
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Question # 29
What is shapes of a pure note
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Sinwave
Sawtooth
Square wave
Triangular wave
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Question # 30
Radioactive decay series can be represents on
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Smith chart
Segre chart
Logarithmic chart
Carbon paper
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Question # 31
If a liquid does not wet a solid surface, the angle of contact is.
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Less than 90
o
Greeter than 180
o
90
o
Between 90
o
and 180
o
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Question # 32
Natural radioactivity was discovered in.
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1978
1896
1904
1906
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