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PPSC Physics Full Book MCQs With Answers
Question # 1
The electric bulb does not obey Ohm's law because.
Choose an answer
Current changes
Resistance changes
Heat is produced
All of these
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Question # 2
Which of the following is a method of energy transfer.
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Conduction
Wave motion
Radiation
All of these
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Question # 3
The gravitational strength on the surface of moon is 1.6 N kg-1 What will be the mass and weight of an object respectively on the surface of the moon.
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10 kg , 1.6 N
10 Kg , 16 N
16 Kg, 10 N
16 kg, 160 N
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Question # 4
Inertial mass and gravitational mass are
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Opposite
Proportional
Weights
Inversely proportional
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Question # 5
Which of the following are sources of direct current.
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Batteries
Solare cells
Thermocouples
All of these
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Question # 6
In a compound microscope objective lens acts as a projector and eye place as a
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Compensator
Erecting lens
Simple microscope lens
Turntable
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Question # 7
Which of the following configuration of BJTs gives both voltage gain and current gain.
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common Base
Common Emtter
Common collector
All of the above
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Question # 8
Which phenomenon is responsible formation of shadows.
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Interference of light
Diffraction of light
Polarization of light
Propagation of light
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Question # 9
A part of electromagnetic spectrum that can be detected by the human aye
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Angle of incidence
Angle of refraction
Light
Angle of reflection
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Question # 10
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 # 11
High concentration of red blood cells increases the viscosity of blood from
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2 -3 time's that of water
3-4 times that of water
3 - 5 times that of water
4 -5 times that of water
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Question # 12
A rod of refractive index 1.42 is immersed in a liquid of refractive index 1.42 the rod will
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Become invisible
appear slightly bent
Appear slightly raised
Reduce its refractive index
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Question # 13
At which temperature a ferromagnetic material becomes paramagnetic on healing.
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Kelvin temperature
Celsius temperature
Curie temperature
Fahrenheit temperature
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Question # 14
If a charged body is moved against the electric field it will gain.
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P.E
K.E.
Electrical P.E.
Gravitational energy
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Question # 15
The light rays which combine destructively would mean that resultant
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Intensity increases
Intensity decreases
Amplitude increases
Amplitude decreases
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Question # 16
The most abundant isotope of neon is.
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Neon -20
Neon -21
Neon -22
Both a and c
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Question # 17
The potential difference between two points is equal to the difference of
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Kinetic energy
potential energy
Electric current
Charge energy
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Question # 18
The picture to be transmitted must be scanned because in T.V transmission light wave are first changing into.
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sound wave
Electric fluctuations
Magnetic fluctuations
Signals
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Question # 19
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 # 20
Which type of image is formed by a concave lens on a screen.
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Inverted and real
Inverted and virtual
Upright and real
Upright and virtual
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Question # 21
During an adiabatic gas expansion the environment
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Serves as a heat sink
Serves as a heat source
Must be at a higher temperature than the gas
Does not have to participate
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Question # 22
The maximum K.E. with which photoelectrons are emitted depends very strongly on the.
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Intensity of incident light
Electric field near the photocathode
Frequency of incident light
Polarization of incident light
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Question # 23
at room temperature the p.d. between the two sides of depletion region for silicon is of the order of.
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0.3 V
0.5 V
0.7 V
0.9 V
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Question # 24
Thermodynamics deals with
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Isolated systems
The interactions among various parts of the system
The microscopic behavior of a system
The interactions between system and surrounding
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Question # 25
A Galilean telescope with objective of coal length 30 cm and eyepiece of focal length.8 cm when focused for infinity has length equal to
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7.5 cm
2.2 cm
38 cm
240 cm
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Question # 26
The gas temperature is increased from 27
o
C to 127
o
C What is the ratio of mean kinetic energies.
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3/4
4/3
9/10
10/9
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Question # 27
The line passing symmetrically though the optical center of the lens is.
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Focal plane
Principal focus
Principal axis
Focal length
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Question # 28
Which law states that a change in the internal energy of a closed thermodynamic system is equal to the difference between the heat supplied to the system and teh amount of work by the system on the surrounding.
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Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Third law of thermodynamics
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Question # 29
A straight wire carrying current will experience a force when place in uniform magnetic field if
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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 # 30
If a person winds a coil of wire around a steel rod and then passes an electric current through the wire then the
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Steel rod becomes an electromagnet
Steel rod becomes hot
Wire becomes magnetized
wire becomes demagnetized
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Question # 31
What do we study by crystallography.
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The analysis of X ray spectra of elements and study of crystal structure.
Visible spectra of sources and crystal study
Ultraviolet spectra of sources and crystal study
Characteristics of X-rays
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