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PPSC Physics Full Book MCQs With Answers
Question # 1
Internal energy of a gas decreased when
Choose an answer
It gains heat
Change in cycle
Change in adiatatic
Change in reversible
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Question # 2
A simple pendulum suspended from the celling of a lift has a time period T when the lift falls freely the time period of the pendulum will become
Choose an answer
Zero
T/9.8
9.8 T
Infinity
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Question # 3
How many terminals does a BJT have.
Choose an answer
1
2
3
4
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Question # 4
Which of the following solids exhibits only short range order.
Choose an answer
Amorphous solids
Polymeric solids
Crystalline solids
All of the above
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Question # 5
Which of the following is defined as the amount of heat required to raise the temperature of 1 g of water by 1
o
C
Choose an answer
Joule
BTO
Electron volt
Calorie
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Question # 6
Why transistor is preferred to triode valve for use as an amplifier.
Choose an answer
Because it can handle large power
Because it has higher input impedance
Because it has higher voltage gain
Because it has lower voltage gain
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Question # 7
If in Young's double slit experiments the separation between two slits is halved then the fringe width
Choose an answer
Remains unchanged
Becomes double
Reduces to half
Becomes 3 times
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Question # 8
The spacing of electric field lines between two identical point charges of opposite signs
Choose an answer
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 # 9
In a n-type material there is an excess of.
Choose an answer
Free electrons
Holes
Quarks
Measons
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Question # 10
Which of the following is dimensionless.
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Strain
Stress
Pressure
Volume
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Question # 11
When transvers wave travelling in a less dense medium is reflected at an interface will a more dense medium.
Choose an answer
A trough becomes a crest
There is no phase shift
There is phase shift of 360
o
A crest remains a crest
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Question # 12
In rotational motion the quantity which plays the same role as the inertial mass in rectilinear motion.
Choose an answer
Angular momentum
Linear momentum
Moment of inertia
Torque
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Question # 13
The process of pair production will take place if the energy of photon is greater than.
Choose an answer
0.21 MeV
0.51 MeV
1.51 MeV
1.21 MeV
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Question # 14
When the number of turns in the solenoid is doubled without any change in teh length of the solenoid its self inductance will be.
Choose an answer
Halved
Doubled
4 times
8 times
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Question # 15
MT-2 is the dimensionless formula of.
Choose an answer
Moment of iniertia
Viscosity
surface tension
Angular acceleration
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Question # 16
A straight wire carrying current will experience a force when place in uniform magnetic field if
Choose an answer
The current and field are parallel
The current and field are at an angle
the current and field are parallel in opposite directions
All of the above
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Question # 17
When net torque acting on a system is zero which of the following will be constant.
Choose an answer
Force
Angular momentum
Linear momentum
Linear impulse
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Question # 18
X-rays are absorbed maximum by
Choose an answer
Paper
Copper
Steel
Lead
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Question # 19
Why freezer a refrigerator is located in the top section
Choose an answer
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 # 20
The dimensions of strain are.
Choose an answer
[MLT-2]
[ML-1T-2]
[ML-2T-3]
It is a dimensionless quantity
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Question # 21
The source of magnetic field are
Choose an answer
Isolated magnetic poles
Electric charge distributions
Current loops
Solenoids
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Question # 22
The half life of a radioactive substance depend on.
Choose an answer
Pressure
Temperature
Amount of substance
No external influences
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Question # 23
When we pass a radiation from a radioactive material through an electric field.
Choose an answer
All three kinds of rays will be deflected
Only the Gama rays are deflected
The Alpha and Beta particles are deflected
Only the alpha particles are deflected
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Question # 24
The value of critical angle of glass is
Choose an answer
45
o
42
o
48
o
52
o
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Question # 25
Which animal did Erwin Schrodinger contemplate using in his famous thought experiment.
Choose an answer
mouse
Cat
Dog
Rabbit
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Question # 26
A semiconductor diode conducts only when it is
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Not biased
Zero biased
Reverse biased
Forward and biased
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Question # 27
Convention is the transfer of thermal energy by means of currents in
Choose an answer
Pressure
Temperature
Liquids
Fluids
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Question # 28
What is term for tendency of a system to oscillate with larger amplitude at some frequencies than at others.
Choose an answer
Resonance
Impedance
Inductance
Capacitance
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Question # 29
The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.
Choose an answer
Directly proportional to n
Directly proportional to n2
Inversely proportional to n
Inversely proportional to n2
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Question # 30
If an object moves with velocity of light the apparent length of the object moving the direction of motion becomes.
Choose an answer
Larger
Smaller
Zero
Infinity
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Question # 31
The phenomenon of Compton's effect process that right has
Choose an answer
Wave nature
Particle nature
Dual nature
Corpuscular nature
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