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PPSC Physics Full Book MCQs With Answers
Question # 1
The wave form of SHM is a
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Sine wave
Cosine wave
Square wave
Electromagnetic wave
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Question # 2
A device used to detect and measure charge is.
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A voltmeter
An ammeter
An electroscope
An amplifier
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Question # 3
Who originated the idea of heat death of the universe is 1852
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Lord Kelvin
James thomson
John Thomson
Saadi Carnot
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Question # 4
A man of mass 100 kg is standing in an elevator. The net force acting on the man reads its weight when the elevator is going up with acceleration 4 m s-2 would be.
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100 N
590 N
490 N
980 N
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Question # 5
Which of the following pairs represent units of the same physical quantity.
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Kelvin and joule
Kelvin and calrorie
Newton and calorie
Joule and calorie
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Question # 6
The long distance transmission of electrical energy is done at.
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High potential and low current
High potential and highs current
Low potential and high current
Low potential and low current
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Question # 7
Reversible alternation of the form of dimensions of a solid body under stress and strain is called.
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elastic limit
Plastic limit
elestic deformation
Plastic deformation
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Question # 8
Angular frequency time period and frequency in SHM do not depend upon.
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Mass
Force constant
Amplitude
All of these
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Question # 9
A body of mass 2 kg attached to a spring is pulled to a distance of 4 cm What will be the value of spring constant K.
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490 N m-1
980 N m-1
1260 N m-1
1960- N m-1
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Question # 10
Which law states that an induced current is always in such a direction as to oppose the motion or change causing it.
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Ampere's law
Gauss's law
Lenz's law
Kirchoff's law
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Question # 11
On which of the following the kinetic theory of gases is not applicable.
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Water vapour
Smoke particles
Bound particles
Free electrons
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Question # 12
In a purely resistive circuit carrying A.C. current the.
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Current and voltage are always in phase
Current lags the voltage by 1/4 cycle
Voltage lags the current by 1/4 cycle
Current leads the voltage by 1/2 cycle
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Question # 13
The internal inertia of a thermodynamics system is known as.
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Enthalpy
Entropy
Isotherm
Adiabatic
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Question # 14
Negative feedback
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Increases stability
Decreases stability
Produces oscillatory
Cannot occur
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Question # 15
When a vector is multiplied by a negative number its direction.
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Remains unchanged
Changes by 180
o
Becomes horizontal
Vertical to each other
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Question # 16
A logic circuit with one input and one output that inverts the input signal at the output is.
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AND gate
NOT gate
OR gate
NOR gate
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Question # 17
A 800 W toaster and a 1.3 kW frying pan are plugged into the same 120 V lines, then
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Fuse will not blow
Fuse will blow
Supply will spark
Only toaster can work
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Question # 18
What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A.
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4.8 W
14.5 W
30 W
60 W
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Question # 19
Two magnetic lines of force
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Out near the poles
Never cut each other
Cut at a neutral point
Cut according to position of the magnet
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Question # 20
The reciprocal of decay constant lamda of a radioactive substances is equal to.
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total life
Half life
Mean life
Curie
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Question # 21
In what form is the energy stored in an inductor.
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Magnetic
electrostatic
Magnetic and electrostatic
All of the above
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Question # 22
A wave source of frequency 1000 Hz emits waves of wavelength 0.1 m How long does is take for the waves to travel 2500 m.
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20 s
25 s
40 s
100 s
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Question # 23
Which onw of the following is deflected by an electric field.
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Alpha particles
Gama rays
Neutrons
x rays
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Question # 24
For maximum range angle of projection of the projectile should be
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45
o
90
o
120
o
180
o
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Question # 25
The spacing of electric field lines between two identical point charges of opposite signs
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Is not indication of the field direction
Is not dependent on the magnitude of the charges
Is an indication of the field strength
Is large when the charges are very large
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Question # 26
A sample of an ideal gas may i) energy adiabatically, or ii) Expand isothermally. the net flow of heat into the gas from the exterior is.
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Positive is each case
Negative for i) and positive for ii)
Zero for i) and positive for ii)
Positive for i) and negative for ii)
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Question # 27
A wave reflected from the boundary of a rarer medium will have phase change
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0
o
60
o
90
o
180
o
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Question # 28
The dimensions of universal gravitational constant G are.
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[MLT-2]
[ML -2T-2]
[M-1L2T-2]
[ML-1T-1]
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Question # 29
The current passing across a p-n junction due to minority charge carriers is called
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Reverse current
Forward current
Leakage current
Both a and b
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Question # 30
Current in an electrolyte is carried by.
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Electron only
Anions only
Citations only
Mesons only
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Question # 31
In any collision between two bodies there need nor the conservation of
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Linear momentum
Angular momentum
Total energy
Kinetic energy
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