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PPSC Physics Full Book MCQs With Answers
Question # 1
When a positive charge is allowed to move from positive to negative plate, then it will gain
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P.E.
K.E
Gravitational energy
Electrical P.E.
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Question # 2
A diode cn be used as
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Amplifier
Rectifier
Oscillator
Transistor
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Question # 3
Which uranium isotope having the atomic weights as given below is easily fissionable.
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234
235
236
238
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Question # 4
When transistor works as an amplifier, its output is.
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More
Less
Zero
Directly proportional to the input
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Question # 5
The instantaneous voltage across a pure inductance.
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Leads the current by 90
o
in phase
Lags the current by 90
o
in phase
Is in phase with the current
Leads the current by a phase angle which depends on the frequency
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Question # 6
If we place oure hand below a lighted lamp we feel warmer due to.
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Conduction
Convection
Radiation
None of these
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Question # 7
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 # 8
Charge carriers in thermocouples are.
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Anions
Cations
Electrons
Protons
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Question # 9
What does a dynamo generate
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Electrons
Emf
anion
Cation
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Question # 10
Which of the following form of electromagnetic energy has the highest frequency.
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X rays
Game rays
Ultraviolet waves
Infrared waves
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Question # 11
The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.
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Directly proportional to n
Directly proportional to n2
Inversely proportional to n
Inversely proportional to n2
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Question # 12
Which of the following is invariant under Galilean transformation.
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Velocity
Impulse
Momentum
Distance
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Question # 13
Certain gas are called permanent gases because.
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They cannot be liquified
They are perfect gases
The critical temperatures are low
their boiling points are low
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Question # 14
What is the amount of mechanical work done to melt 1 g of ic completely
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4.2 J
42 J
80 J
336 J
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Question # 15
Which quantity provides a quantitative measure of disorder.
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Entropy
Enthalpy
Randomness
Chaos
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Question # 16
What makes the air coming out of a punctured tyre cool.
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Isothermal expansion
Adiabatic expension
Flow at high speed
Atmospheric pressure
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Question # 17
Which quantity remains fixed in isobars.
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Mass number
Atomic number
Number of neutrons
Number of protons
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Question # 18
Who proposed that light energy travels in space by means of wave motion.
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Maxwell
Planck
De-Broglie
Huygen
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Question # 19
The study of atomic structure of crystals by x rays was initiated by.
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Mosely
Young
Huygen
Bragg
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Question # 20
What information is given by the tangent to a field that point of electric field.
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Magnitude
Direction
Proper unit
Dimensions
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Question # 21
Which one of the following has maximum frequency.
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Visible light
Gama rays
Ultraviolet rays
Infrared rays
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Question # 22
The impedance of the circuit at resonance frequency is
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Minimum
Maximum
Zero
Infinity
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Question # 23
Which is the correct statement regarding the nature of light.
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It has wave nature
It has particle nature
It has both wave and particle nature at the same time
It has wave nature sometime and particle nature at some other time.
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Question # 24
An A.C. dynamo operates on the principle of
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Mutual induction
Self induction
Electromagnetic induction
Mechanical induction
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Question # 25
The weight of a man in an elevator moving down with an accelerating of 9.8 m s-2 will be come
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Half
Zero
9.8 N
Double
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Question # 26
Which of the following is the ideal gas equation.
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PV -n RT
P/V = n RT
V/P = nR/T
PV = T/nR
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Question # 27
Polarization is characteristic of.
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Light wave
sound waves
Waver waves
x-rays
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Question # 28
Which liquid can flow easily.
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Traacle
Pitch
Ether
All flow with same rate
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Question # 29
What is the represented by the area inside the Carnot cycle.
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Heat taken to increase the body temperature.
Energy loss due to leakage
Useful work done
Heat rejected by the system
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Question # 30
Which scientist announced for the first time that the universe is expanding.
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Einstein
Newton
Edward Hubble
Karl Marx
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Question # 31
Inserting a di electric between the plates of a charged parallel plate capacitor.
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Decrease the capacitance
Leaves teh capacitance the same
Encourages breakdown between the plates
Reduces the electric intensity between the plates
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