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PPSC Physics Full Book MCQs With Answers
Question # 1
The value of power factor in an LCR sense circuit at resonance is.
Choose an answer
Zero
0.5
unity
Infinity
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Question # 2
The half life of a given radioactive isotope is 10 years The original mass of the isotope is 12 g What mass of this isotope remains un decayed after 20 years.
Choose an answer
0.5 g
1.2 g
3.0 g
6.0 g
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Question # 3
The phenomenon in which a charging current in one coil induces an emf in another coil is called.
Choose an answer
Induced current
Induced emf
Self induction
Mutual induction
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Question # 4
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 # 5
Laser light is considered to be coherent because it consists of.
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Many wavelengths
Uncoordinated wavelengths
Coordinated waves of exactly the same wavelength
Divergent beams
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Question # 6
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 # 7
Which of the following refers to the distance from crest to crest of a wave.
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Frequency
Wavelength
Amplitude
Period
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Question # 8
A bulb of 100 W is connected to a 160 V supply What will be the power consumed.
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25 W
30 W
50 W
64 W
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Question # 9
When we decrease the diameter of the objective lens of a telescope the resolution of telescope
Choose an answer
Increases
Decreases
Remain the same
Depends upon the focal length of the lens
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Question # 10
When a ray of light enters from rarer medium to a denser medium its wavelength.
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Increases
Decreases
Remain constant
Vanishes
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Question # 11
On which of the following parameters capacitance does not depend upon.
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Area of the plates
Medium between the plates
Distance between the plates
Nature of material for plates
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Question # 12
The bunding energy per nucleon for iron is.
Choose an answer
zero
Maximum
Negative
Minimum
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Question # 13
The phenomenon in which a photon of frequency 'f' is scattered by an electron and the scattered photon has frequency f <f is known as.
Choose an answer
Pair production
Pair annihilations
Photoelectric effect
Compton's effect
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Question # 14
Supplementary units radian and steradian were established for
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Density
Viscosity
electric intensity
Geometrical quantities
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Question # 15
Crystalline solids are of.
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Short range order
Long range order
Intermediate range
Plastics
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Question # 16
The locus of all points in the same state of vibrations are known as.
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half period zone
A wavefront
A half wave zone
A full wave zone
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Question # 17
The division and germier experiment relates to
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Diffusion
interference
Polarization
Electron diffraction
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Question # 18
Which of the following are defects in human eye.
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Myopia
Hypermetropia
Presbyopia
All of these
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Question # 19
The diver spins faster when moment of inertia becomes
Choose an answer
Smaller
Greater
Double
zero
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Question # 20
A given quantity of an ideal gas is at pressure P and temperature T What is the isothermal bulk modulus of the gas.
Choose an answer
2/3 P
P
2P
3/2 P
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Question # 21
Which of the following statements concerning G and g is true.
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g is scalar white g is a vector
g is inversely proportional to the mass of the planet
g is independent of the mass of the planet
both G and g have the same units
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Question # 22
Materials that experience a force from stronger to weaker regions of magnetic field are called.
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Non magnetic
Paramagnetic
Ferromagnetic
Diamagnetic
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Question # 23
Thermocouple is combination of.
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Thermocouples
Capacitors in parallel
Resistors in series
Ammeter and voltmeter
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Question # 24
X-rays are a part of electromagnetic spectrum and are characterized by frequencies higher that those of.
Choose an answer
Infrared radiation
Ultraviolet radiation
Far ultraviolet radiation
Far infrared radiation
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Question # 25
The heat required to sublime one mole of the substance at standard temperature and pressure is called.
Choose an answer
Latest heat
Specific heat
Heat of sublimation
Heat capacity
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Question # 26
A logic circuit whose output signal is '1' when inputs are different is.
Choose an answer
NAND gate
NOR gate
Exclusive OR gate
Exclusive NOR gate
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Question # 27
Two lenses of focal length 'f' are combined the resultant focal length is
Choose an answer
f
2f
f/2
zero
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Question # 28
Which onw of the following is deflected by an electric field.
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Alpha particles
Gama rays
Neutrons
x rays
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Question # 29
In the direction indicated by an electric field line.
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The electric field strength must increases
The electric field strength must decreases
The potential must remain constant
The potential must decreases
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Question # 30
A wave that remains in a constant position is called.
Choose an answer
Standing wave
Transvers wave
Shock wave
Longitudinal wave
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Question # 31
The mass of an alpha particle is.
Choose an answer
2 u
4 u
6 u
8 u
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