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PPSC Physics Full Book MCQs With Answers
Question # 1
Who invented commutator.
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William Sturgeon
William Smith
Michael Faraday
Mosely
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Question # 2
The consumption of energy by a 60 W bulb in 2 s is
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0.02 J
30 J
60 J
120 J
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Question # 3
The first demonstration of wave nature of light was provided in 1801 by the experiment of
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HHuygen
Thomas young
Fresnel
Maxwell
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Question # 4
If the base emitter junction is forward biased and base collector junction is reverse biased the BJT is in.
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cut of mode
Amplification mode
Saturation mode
Inversion mode
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Question # 5
In CC configuration voltage gain is.
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Less than one
More than one
One
Zero
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Question # 6
Which one of the following temperature scales is independent of the properties of any particular substance.
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Kelvin scale
Gas scale
Thermodynamic scale
Celsius scale
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Question # 7
The concept of entropy was introduced by
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Saadi Carnot
Boyle
Charles
Rudolph Celsius
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Question # 8
In a n-type material there is an excess of.
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Free electrons
Holes
Quarks
Measons
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Question # 9
a 5 kg mass is falling freely the force acting on it will be.
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0 N
9.8 N
5 N
19.6 N
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Question # 10
Electromotive force is closely related to.
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Inductance
Magnetic flux density
Potential difference
Electric field intensity
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Question # 11
A magnetic pole
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Is made of a magnetic material
Is a factious quantity
Is defined in terms of Ampere's law
Cannot be detected
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Question # 12
The internal resistance of a primary cell depends upon the.
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Current dawn form the cell
Concentration of the solution
distance between cell electrodes
All of the above
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Question # 13
Which method of charging is involved in making lightning.
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Induction
Friction
Contact
Convection
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Question # 14
When the frequency of A.C in L - C- R circuit is incrased the impedance of L-C-R circuit.
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Increase
Decrease
Remain unchanged
First decrease and then increases
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Question # 15
In rotational motion, the analogue of force is.
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moment of inertia
Moment of force
Torque
Rotational inertia
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Question # 16
What is the range of values of power factor.
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0 to -1
0 to +1
0 to 2
2 to 3
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Question # 17
The sound waves used sonography are
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Less than 20 KHz
of 20 Khz
Greater than 20 KHz
Of 20 MHz
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Question # 18
The dimensional formula for torque is identical to.
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Kinetic energy
Pressure energy
Moment of force
All of the above
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Question # 19
Efficiency of a Carnot engine depends on
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Temperature
Pressure
Volume
The nature of working substance
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Question # 20
A galvanometer can be converted into voltmeter by connecting in series with the galvanometer a
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Low resistance
High resistance
Resistance of intermediate range
Shunt
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Question # 21
The unit of energy are the same as that of
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Force
Power
Work
Efficiency
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Question # 22
The change in entropy for any reversible cycle is identically
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Infinite
Positive
Negative
Zero
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Question # 23
On which principle the induction coil works on.
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Self induction
Ampere's rule
Mutual induction
Gauss's law
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Question # 24
The viscosity of an ideal fluid is
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Infinity
Unity
Zero
0.5
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Question # 25
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 # 26
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 # 27
Usually in an operational amplifier the inputs used are of
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Equal voltage and same polarity
Equal voltage and opposite polarity
Different voltage and same polarity
Different voltage and opposite polarity
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Question # 28
In a spectrometer experiment monochromatic light is incident normally on a diffraction gratin having 4.5 x 10
5
lines per metre The second order line is seen at an angle of 30
o
to The normal What is the wavelength of the light.
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430 nm
556 nm
589 nm
625 nm
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Question # 29
The susceptibility of a paramagnetic material is
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negative
Positive
Zero
Infinity
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Question # 30
An operational amplifier have how many input terminals.
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One
Two
Three
Four
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Question # 31
The term used for heat capacity per unit mass is.
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Latent heat
Specific heat
Energy density
Specific energy
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