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PPSC Physics Full Book MCQs With Answers
Question # 1
The interference between two sounds of slightly differed frequency is
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shock wave
Beats
Sonic boom
Doppler's effect
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Question # 2
Capacitance is directly proportional to
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Distance between the plates
Di electric strength
Area of the plates
Charge multiplied by the applied voltage
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Question # 3
At absolute zero of temperature.
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The molecular energy is zero
Molecules have translational K.E
Molecules have rotational K.E.
Molecules have maximum energy
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Question # 4
A heat engine with 100% efficiency would have to
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Do no work
Be at a uniform temperature
Use no heat
Discharge at 0
o
C
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Question # 5
Which principle is in effect when a ship displaces ocean water.
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Bernouli's
Pascal's
Hook's
Archimedes
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Question # 6
The use fulness of x rays is largely due to their
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Mass
Density
Penetrating power
Rest mass
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Question # 7
The point midway between the lens surface on its participial axis
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Optical centre
Principal focus
Focal plane
Focal length
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Question # 8
A ball is thrown straight up What is its acceleration just before it reaches the highest point.
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Zero
slightly less than g
Exactly g
Slightly greater than g
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Question # 9
What should be the shape of an ideal thermometer.
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Sphereical
Cubical
Cylindrical
Rectangular
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Question # 10
What would be the colour of sky n the absence of atmosphere.
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Blue
Indigo
Red
Black
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Question # 11
Reciprocal of the focal length is called.
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Radios of curvature of the lens
Power of the lens
Aperture of the lens
Resolving power
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Question # 12
Distance between two consecutive nodes or antinodes is equal to.
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Lamda /4
Lamda
Lamda /2
2 lamda
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Question # 13
At high temperature a body generally emits redactions of.
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Small wavelengths
Long wavelengths
Moderates wavelengths
Zero wavelengths
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Question # 14
The temperature scale based upon triple point of water was given by
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Rumford
Carnot
Kelvin
Celsius
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Question # 15
Which scientist made the fist successful terrestrial measurement of the speed of light
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Isaac Newton
Ole Romer
Armand Fizeace
Albert Michelson
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Question # 16
Angular simple harmonic motion is.
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Periodic rectilinear motion
Independent of any applied torque
Periodic rotational motion
Never defined
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Question # 17
The radius of second orbit of hydrogen atom is
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0.071 A
0.142 A
4.752 A
9.5298 A
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Question # 18
In radiotherapy X-rays are used to.
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Treat cancer
Delect bone fracture
Cure heart diseasee
All of the above
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Question # 19
Which one of the following is not a dimensionless quantity.
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Radian
pi
Decibel
Force
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Question # 20
Which of the given factors is increased in a step down transformer.
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Voltage
Current
Wattage
Resistance
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Question # 21
The quality of sound
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Decreases with pitch
Varies directly as its pitch
Varies inversely as its pitch
Depends upon the overtones present there
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Question # 22
The process in which a system undergoes a change of state at constant volume.
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Isobaric process
Isochoric process
Isothermal process
Adiabatic process
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Question # 23
Which of the following a natural example of a capactor.
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Fire
Snow
Air
Lightining
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Question # 24
In which reaction two or more small light nuclei nuclei come together or fuse to form a large nucleus.
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Radioactivity
Radioactivity dating
Nuclear fusion
Nuclear fission
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Question # 25
Which of the following scientists is known for his exceptional work in the field of optics.
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Albert Einstein
Issac Newton
Ibn al Haithem
Alberuni
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Question # 26
A mass accelerates uniformly when the resulting force acting on it.
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is zero
Is constant but not zero
Increases uniformly w.r.t time
Is proportional to the displacement of the mass from a fixed point
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Question # 27
The unit of Rydberg constant R is
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m
m3
m
-1
m-2
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Question # 28
Faraday's law was deduced in
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1826
1831
1836
1841
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Question # 29
Absolute zero may be regarded as the temperature of which
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Water freezes
All substances are solids
All gases become liquids
Molecular motioning a gas would ceases
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Question # 30
The continuous x rays spectrum is obtained due to
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Deceleration of impact electrons
Breaking potential
Excitation potential
Ionization potential
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Question # 31
In an isochoric process.
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Volume changes
Pressure changes
Temperature changes
Volume remains constant
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