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PPSC Physics Full Book MCQs With Answers
Question # 1
The half life of radium -226 is
Choose an answer
1620 years
45 x 10
9
years
3.8 days
23.5 minutes
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Question # 2
Which of the following is not a ferromagnetic materials.
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Iron
steel
Copper
Cobalt
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Question # 3
The primary purpose of using a large aperture objective in a telescope is to produce
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Brighter image
Larger image
Wider field of view
Smaller image
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Question # 4
The maximum K.E of photo electrons depends upon
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Energy of incident radation
Frequency of incident radiation
Wavelength of incident radiation
Mass of incident radiation
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Question # 5
The first super conductor was discovered in.
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1905
1911
1917
1923
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Question # 6
The SI unit of torque is
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kg ms-2
kg m2s-2
kg ms-1
kg m2 s-3
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Question # 7
Which technique uses underwater sound propagation to detect and locate submerged objects.
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RADAR
LIDAR
SONAR
LASER
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Question # 8
The venturimeter is an instrument used for measuring the
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Viscosity of a liquid
Flow speed of a liquid
Compressibility of a fluid
Specific gravity of a liquid
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Question # 9
The perpendicular distance between the line of action of forces and the axis of rotation
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Torque
Moment arm
Moment of force
Momentum
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Question # 10
A expression for total work done by the battery to move charge against an induced emf is equal to.
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W = LI2
W = 1/2 LI
W = 1/2 L3I
W = 1/2 LI2
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Question # 11
Magnetic effect of current was discovered by
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Faraday
Fleming
Oersted
Ampere
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Question # 12
What is the direction of the magnetic field lines inside a bar magnet.
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From north pole to south pole
From south pole to north pole
From side to side
There are no magnetic field lines
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Question # 13
The input resistance of a JFET is of the order of.
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1 M Mega
10 M Mega
100 M Mega
1,000 M Mega
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Question # 14
A galvanometer can be converted into voltmeter by connecting in series with the galvanometer a
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Low resistance
High resistance
Resistance of intermediate range
Shunt
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Question # 15
Which of the following pair is correct.
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Rutherford - x-rays
Roentgen - Electron
Chadwick - Neutron
J.J. Thomson -Photon
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Question # 16
Why FET amplifiers are called voltage controlled devices.
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Input is a current signal
Output is a current signal
Input is a voltage signal
Output is a voltage signal
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Question # 17
When a ray of light travelling in a denser medium enters into a rarer medium.
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It remains undeviated
It is reflected back
It bends towards the normal
It bends away from the normal
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Question # 18
If the image is virtual then its distance from the lens is taken.
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Positive
Negative
Double
Half
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Question # 19
Which of the following are defects in human eye.
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Myopia
Hypermetropia
Presbyopia
All of these
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Question # 20
Electric field lines
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Start from a negative charge and terminal ate on a positive charge
Never cross each other
Always cross each other
Leaving a positive charge are not proportional to the maginitud of charge
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Question # 21
A magnetic field is said to exist at a point if
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A force is exerted on a charge placed at that point
A magnetic pole exists at that point
An ampersand current loop surrounds the point
A force not felt by a static charge acts on a moving charge placed at that point
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Question # 22
The SI unit of coefficient of viscosity of
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kg m s-1
kg m-1 s-1
kg m-1 s-1
kg ms -2
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Question # 23
When 5 C of charge flows through a particular resistor 10 J of energy is converted What is the p.d. across the resistor.
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0.5 V
2.0 V
15 V
50 V
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Question # 24
In a compound microscope magnification will be large if focal length of eyepiece is
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Large
small
Equal to that of the objective
Larger than that of the objective
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Question # 25
The number of molecules or atoms in a specific volume of a gas is independent of their
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Volume
Pressure
Size
Temperature
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Question # 26
The kinetic molecular model of matter describe matter an being made up of molecules in continuous.
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Vibratory motion
Random motion
rotatory motion
Linear motion
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Question # 27
The process of mixing sound waves with carrier waves is known as.
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Rectification
amplification
Modulation
Demodulation
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Question # 28
When X
c
= X
l
, this condition is called.
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Equality
Balanced
Resonance
Equlibrium
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Question # 29
Which materials have exactly zero electrical resistivity.
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Metals
Insulators
Semi conductors
Super conductors
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Question # 30
Equipotential surfaces in an electric field are always.
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Spherical
Closed surfaces
Tangent to electric lines of force
Perpendicular to electric lines of force
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Question # 31
Who suggested that energy is radiated or absorbed in discrete packers called quanta.
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Max. Planck
Stefan
Lummer
Boltzmann
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