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PPSC Physics Full Book MCQs With Answers
Question # 1
The SI unit of impulse is.
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N m
N s
Kg ms -1
Both b and c
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Question # 2
When a force of 16 N acts on a mass of 4 kg for a time of 4 s. What is the rate of change of momentum.
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1 kg m s-2
4 kg m s-2
8 kg m s-2
16 kg m s-2
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Question # 3
The binding energy to pull the deuterium H apart into a proton and a neutron is equal to.
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1.22 MeV
2.22 MeV
3.22 Mev
4.22 MeV
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Question # 4
Any substance that can flow is a
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Solid
Gas only
liquid only
Fluid
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Question # 5
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 # 6
A solid object is
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Not elastic below the elastic limit
Not elastic above the elastic lime
Elastic below the elastic limit
Not elastic at all
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Question # 7
When the frequency of A.C in L - C- R circuit is incrased the impedance of L-C-R circuit.
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Increase
Decrease
Remain unchanged
First decrease and then increases
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Question # 8
How much lce will melt by 50,000 J of heat.
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120 J
130 g
140 J
150 g
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Question # 9
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 # 10
The dimensions of universal gravitational constant G are.
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[MLT-2]
[ML -2T-2]
[M-1L2T-2]
[ML-1T-1]
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Question # 11
A heat engine with 100% efficiency would have to.
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Do no work
Be at uniform temperature
Use no heat
Discharge of 0
o
C
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Question # 12
The temperature of a certain substance in Celsius scale of temperature is 800
o
C in Kelvin scale it is.
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173 K
931 K
1073 K
1193 K
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Question # 13
According to Huygen's principle
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Light bends round corners
Light travels in a straight line
All points on primary wave front are considered centre of distances
Light has wave nature
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Question # 14
Who developed the world's first vacuum pump in 1650.
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Otto vori Guricke
Lord Kelvin
Saadi Carnot
James maxwell
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Question # 15
Image formed by a concave lens is.
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Real
Magnified
Virtual
Real and magnified
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Question # 16
Which law states that the angle of incidence equals the angle of refraction.
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Law of reflection
Law of refraction
Snell's law
Hygens's principle
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Question # 17
In which of the following eddy current is not used
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Induction furnace
Automobile speedometer
Electromagnetic damping
X- rays diffraction
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Question # 18
Which of the following is electromagnetic wave.
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X rays
Micro waves
Light
All of these
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Question # 19
Difference between Cp and Cv is equal to
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General gas constant
Planck's conatant
Molar gas constant
Boltzmann's constant
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Question # 20
Which of the following is a transverse wave.
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Sound wave
Shock wave
Hair wave
Radiowave
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Question # 21
A resistance is a device which
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Acids the flow of current is a circuit
Converts electrical energy to heat
Is a type of charge pump
Is like a switch
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Question # 22
Which magnetic properties is inherent in all materials.
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Para magnetism
diamagnetism
Ferromagnetism
demagnetism
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Question # 23
The basic quantity used to describe the state of magnetization of a substance is the
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Magnetic strength
Magnetic susceptibility
Magnetic moment
Magnetic moment per unit volume
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Question # 24
If the wavelength of a wave is 1 cm and its period is 0.02 s , velocity of the wave will be
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20 cm s-1
50 m s-1
60 cm s-1
100 cm s-1
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Question # 25
The effective resistance offered by the resistance capacitance and inductance in an A.C. circuit is known as
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Impedance
Resistance
Capacitance
Reactance
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Question # 26
Which one is not a semiconductor.
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Go As
Ge
Sc
In
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Question # 27
Which both elements are good for nuclear fission.
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Thorium an uranium
Thorium and radium
Plutonium and uranium
Plutonium and throrium
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Question # 28
Oscillatory motion is always under
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An applied force
Restoring force and inertia
A periodic force
A gravitational force
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Question # 29
Magnetic lines of force due to earth's horizontal magnetic field are.
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Curved lines
Elliptical
concentric circles
Parallel and straight
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Question # 30
Molecules of a liquid
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Do not vibrate about their mean position
Are rigidly held with each other
Have weak attractive forces
Have strong attractive forces
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Question # 31
During the projectile motion, the horizontal component of velocity.
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Changes with time
Becomes zero
Does not change but remains constant
Increases with time
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