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PPSC Physics Full Book MCQs With Answers
Question # 1
Planets move around the sun due to.
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Centrifugal force
Centripetal force
Gravitational pull between them
Frictional force between them
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Question # 2
As a positively charged rod is brought closer and closer to a positively charged electroscope the gold leaf.
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diverges
Converges
is neutralized
Is unaffected
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Question # 3
The electromagnetic waves propagated outing space from antenna of a transmitter are known as.
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Infrared waves
Light waves
Radio waves
X-rays
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Question # 4
No current flows between two charged bodies when connected if they have same.
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Charge
Capacity
Potential
Shape
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Question # 5
Any substance that can flow is a
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Solid
Gas only
liquid only
Fluid
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Question # 6
How the small bulbs used for decoration purposes are connected.
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In parallel
In series
In mixed order
In vertical position
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Question # 7
The ratio of tensile stress to tensile strain is called.
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Shear modulus
Bulk modolus
Young's modulus
Elastic limit
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Question # 8
An example of simple harmonic motion is
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Fast moving cricket ball
Motion of bicycle
Motion of a bee
Motion of simple pendulum
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Question # 9
The device in the circuit that consume electrical energy are known as.
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Resistors
Capacitors
Fuses
Load
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Question # 10
The SI unit of gravitational constant G is.
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kg m-1 s-1
kg m2 s-2
kg m3 s-2
kg m2 s-1
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Question # 11
Which of the substances is the lightest one.
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Copper
Mercury
Aluminium
Lead
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Question # 12
Maximum detail of an object can be seen by a microscope when the object is illuminated by light of.
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Longer wavelegth
Shorter wavelength
X -rays
Gama rays
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Question # 13
Which one the following is not a component of a Bipolar junction Transistor
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Base
Emitter
Collector
Grid
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Question # 14
When light emitting diode is forward biased, it emits light of the colour
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Red
Yellow
Green
All of these
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Question # 15
Sub atomic particles which experience strong nuclear force are.
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Leptons
Hadrons
Mesons
Quarks
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Question # 16
A force of 20 N is applied on an elastic spring if the extension produced in the springs to cm, the value of spring constant.
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2 Nm-1
20 N m-1
200 N m-1
2,000 N m-1
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Question # 17
A car is travelling with uniform acceleration the road has check posts every 100 m When the car passes one post , it has a speed of 10 m s-1 and when passes the next one its speed is 20 ms-1 What is the cars acceleration.
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0.67 m s-2
1.5 m s2
2.5 m s-2
6.0 m s-2
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Question # 18
Inductance divided by resistance and the product of capacitance and resistance both have units of.
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Charge
Time
Force
Current
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Question # 19
If a wave vibrate 10 times in 1 s with a speed of 10 m s-1 the correct wavelength of the wave is.
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1 m
10 m
20 m
100 m
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Question # 20
When two point charges of equal magnitude and opposite sign exist very close to one another the arrangement is called.
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An electric dipole
An amperian current
A null charge
A neutral source
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Question # 21
Hygen's principle states that
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Light travels in straight line
Light travels in electromagetic waves
All points of primary wave front are source of secondary wavelets
Light has dual nature
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Question # 22
Which of the following are particle accelerators.
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Cyclotrons
Synchrotrons
Linear accelerators
All of the above
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Question # 23
Which statement is true about the Magnetic poles.
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Unlike poles repel
Like poles attract
Magnetic poles do not effect each other
A single magnetic pole does not exist
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Question # 24
Which following properties of molecules of a gas is same for all gases at a particular temperature.
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Momentum
Mass
velocity
K.E.
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Question # 25
At high frequency the current through a capacitor will be
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Small
Zero
Large
Infinity
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Question # 26
Why freezer a refrigerator is located in the top section
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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
A Carnot engine can be 100% efficient of the sink is at.
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0 k
0 oF
0 oC
273 K
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Question # 28
Sunlight can undergo total internal reflection if it enters from
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Glass to air
Air to glass
Air to water
Water to glass
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Question # 29
Which of the following statement is correct for a particle moving in a horizontal circle with constant angular velocity.
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The linear momentum is constant but the K.E. varies
The K.E. is constant but the linear momentum varies
Both K.E. and linear momentum are constant
Both speed and linear velocity are constant.
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Question # 30
The SI unit of strain is
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N m-1
N m-2
N m
It has no unit
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Question # 31
Torque is equal to.
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The product of magnitude of force and acceleration
The product of magnitude of force and momentum
The product of magnitude of force and displacement
The product of magnitude of force and angular velocity
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