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PPSC Physics Full Book MCQs With Answers
Question # 1
A 4 kJ mass of copper of specific heat capacity of 400 J kg-1k-1 is heated for 160 s by a heater of power 200 W what is the rise in temperature.
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10 K
16 K
100 K
160 K
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Question # 2
The ration of Universal gas constant and Avogadro's number is called.
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Equilibrium constant
Velocity constant
Boitzmann's constant
Gravitational constant
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Question # 3
A fringe is a path of.
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Constant amplitude
Constant phase
Same wavelength
Constant frequency
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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
In onw cycle of a steam engine there are how many dead centres.
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1
2
3
zero
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Question # 6
Birds planes and boats are streamlined to reduce
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Turbulence
Thrust
Drag
Lift
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Question # 7
If the output voltage is not smooth but pulsating then it can be made smooth by using a circuit known as.
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Filter
Gate
shunt
Fuse
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Question # 8
Which of the following is an example of continuous spectra.
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Black body radiation spectrum
Molecular spectra
Atomic spectra
grating spectrum
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Question # 9
Which experiment is a demonstration that matter and energy can display properties of both waves and particles.
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young's double slit experiment
Division germier experiment
Heisenberg's uncertainty experiment
Stern Gerlach experiment
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Question # 10
The product of mass and specific heat of a substance is called.
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Latent heat
Water equivalent
Atomic heat
Heat capacity
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Question # 11
What is the minimum number of thermodynamic parameters required to specify the state of gas system.
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1
2
3
Infinite
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Question # 12
The terminal velocity in case of spherical droplet is directly proportional to.
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Square of the radius of the droplet
Radius of the droplet
Cube of the radius of the droplet
Half of the Radius of the droplet half
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Question # 13
The dispersive power of a grating is
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Light used
Separation of lines
Frequency of light used
Independent of wavelength
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Question # 14
The image formed by a projector is
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Real, inverted and enlarged
Real, upright and enlarged
Real ,inverted and diminished
Virtual, upright and diminished
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Question # 15
When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.
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An increase in pressure
An increase in temperature
A change in phase
A change in entropy
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Question # 16
The horizontal distance of a projectile from the point of launch to the point of impacts is called.
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Height of projectile
Range of projectile
Path of projectile
Angle of projectile
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Question # 17
Echoes arise from
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Reflection
Refraction
Diffraction
Dispersion of sound waves
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Question # 18
Resonance phenomenon in a vibrating body
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May increase the amplitude
May decrease the amplitude
May not affected the amplitude
All of the above
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Question # 19
Intensity of the dark bands in interference pattern becomes zero when two waves.
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Of light are monochromatic
Are of the same frequency
Are of the same amplitude
Travel in opposite direction
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Question # 20
In a projectile motion, the horizontal range depends upon.
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Initial velocity
Velocity at the highest position
angel of projection
Vertical component of velocity
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Question # 21
The dimensions of viscosity are
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[MLT-1]
[MT-2]
[ML-1T-1]
[ML2T-1]
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Question # 22
If pressure and temperature of an ideal gas is doubled and volume is halved, the number of the gas molecules.
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Become half
Remain constant
Become double
Become three times
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Question # 23
Which pair of the following forces has a resultant force of 2 N.
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1 N and 1 N
1 N and 3 N
1 N and 2 N
2 N and 2 N
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Question # 24
Image formed by a camera is
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Real, inverted, and diminished
Virtual, upright and diminished
Virtual, upright and magnified
Real, inverted and magnified
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Question # 25
The first super conductor was discovered by
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Faraday
Lenz
Kamaerlingh Ornes
Oersted
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Question # 26
The temperature which is the same in
o
C and
o
F is.
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-20
-40
20
40
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Question # 27
If the transformer turns ratio is 2 and the impedance of primary coil is 250 Ohms then the impedance secondary coil will be.
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125 Ohms
250 Ohms
500 Ohms
1000 Ohms
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Question # 28
In a purely inductive circuit, the current
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Lags behind the emf by 90
o
Leads the emf by 90
o
Is in phase with emf
May lag or lead the emf
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Question # 29
What is the average K.E. of gas molecules at temperature equal to K.
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kt/3
3/2 KT
1/2 KT
2/3 KT
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Question # 30
When the deforming force applied on a body produces change in length then it is said to be
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Tensile stress
compression stress
Shear stress
Shear modulus
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Question # 31
The average energy released per fission of U is about
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200 eV
2 keV
2 MeV
200 MeV
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