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PPSC Physics Full Book MCQs With Answers
Question # 1
In CC configuration voltage gain is.
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Less than one
More than one
One
Zero
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Question # 2
Which is the heat transfer mode between an object and its environment due to circular fluid motion.
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Conduction
Convection
Radiation
Mass transfer
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Question # 3
In order to measure the true emf of an electrolytic cell it is necessary that.
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The measurement be made while charging the cell
No current be drawn from the cell
The cell be connected into a type circuit
The cell be connected into a parallel type circuit
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Question # 4
The immediate cause of alternating currrent in the secondary coil of a transformer is
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A changing electric field
a changing magnetic field
The motion of primary coil
The iron core of the trnasformer
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Question # 5
A body attached to a spring is pulled to a distance of 20 cm If the value of spring constant is 48 N m-1, the amount of force applied will be.
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4.8 N
9.6 N
96 N
192 N
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Question # 6
If the average velocity of an object zero in some time interval, the displacement of the object for that interval will be.
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Infinite
Zero
Increasing
Decreasing
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Question # 7
A substance which has empty conduction band.
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Insulator
Conductor
Semi conductor
super conductor
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Question # 8
On which parameter the path difference between two interfering waves depends upon.
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Amplitude
Pitch
Intensity
Phase angle
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Question # 9
The process by which nuclei emit a ,b and gama rays in order to attain stability is called.
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Radioactive disintegration
Radio activity
B decay
Radioactive transmulation
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Question # 10
Wave motion in air consist of
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Longitudinal waves
Transverse waves
Seismic waves
Polarized waves
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Question # 11
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 # 12
Prince Louis and Vector de broglie received the Nobel prize in.
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1919
1923
1927
1929
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Question # 13
Neil Bohr made his three postulates in.
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1897
1905
1913
1921
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Question # 14
When a current of 2 A flows for 5 s through a lamp 120 W of power are used How much charge flows through the lamp.
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10 C
12 C
24 C
60 C
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Question # 15
The specific heat capacity of a substance is the amount of heat required to.
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Raise its temperature by 1 K
Raise the temperature of 1 kg of the substance by 1 K
Melt 1 kg of the substance
Boil 1 kg of the substance
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Question # 16
What is the voltage a 6 Mega resistor when 3 A of current passes through it.
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2 V
9 V
18 V
36 V
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Question # 17
Entropy of universe is increasing day by da due to.
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Power generating processes
Energy used into work
Depletion of ozone
All of the above
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Question # 18
A generator produces 100 kW of power of a potential difference of 10 kV the power is transmitted through cables of total resistance 5 Homs How much power is dissipated in the cables.
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50 W
250 W
500 W
5,000 W
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Question # 19
LASER is a device which can produce.
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Monochromatic beam of light
Coherent beam of light
An intense beam of light
All of the above
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Question # 20
What is the power factors of wattles current.
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Infinity
Unity
0.5
Zero
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Question # 21
When the deforming force applied on a body produces change in volume then it is said to be
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Tensile stress
Compression stress
Shear stress
Shear modulus
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Question # 22
The process of getting energy by direct combusting method from the waste products is commonly known as.
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Solid waste
Depletion region
Green house
Fregmentation
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Question # 23
The energy in electron volts necessary to remove the most loosely bound electron from the neutral atom is known as.
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Faraday energy
Wave number
Ionization Potential
Excitation potential
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Question # 24
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 # 25
Any substance that can flow is a
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Solid
Gas only
liquid only
Fluid
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Question # 26
Since selenium becomes conductor in light so it is.
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Photoconductor
Photocell
Thermistor
Photodiode
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Question # 27
While passing through the atmosphere total energy is reduced due to.
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scattering
Absorption
Reflection
All of these
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Question # 28
The ration of Universal gas constant and Avogadro's number is called.
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Equilibrium constant
Velocity constant
Boitzmann's constant
Gravitational constant
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Question # 29
Which property of waves is independent of the others.
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Amplitude
Velocity
Frequency
Wavelength
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Question # 30
The phenomenon of regular refraction of light illustrates taht.
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Light is reflected in one direction only
Light is reflected through a range of different angles
Light is refracted in one direction only
Light is refracted through a range of different angles.
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Question # 31
It is possible is distinguish between transvers and longitudinal waves from the property of.
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Refraction
Interference
Diffraction
Polarization
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