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PPSC Physics Full Book MCQs With Answers
Question # 1
When the temperature of a body is equal to that of the surrounding then the body appears
Choose an answer
Dull black
Red hot
In thermal equilibrium
To be cold
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Question # 2
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 # 3
In a purely resistive circuit carrying A.C. current the.
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Current and voltage are always in phase
Current lags the voltage by 1/4 cycle
Voltage lags the current by 1/4 cycle
Current leads the voltage by 1/2 cycle
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Question # 4
Which of the following causes the deflection of Alpha particles when they re passed through a thin foil.
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Attraction of nucleus
Collision with nuclei
Interactions with electrons
Electrostatic repulsion by the nucleus
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Question # 5
Why does a transformer have a core made of iron.
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Iron has a high melting point
Iron is a magnetic material
Iron potential and high current
Iron is a conductor of electricity
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Question # 6
An AND gate is.
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Equivalent to a series switching circuit.
Equivalent to a parallel switching circuit
Equivalent ot universal gate
A reciprocal of NAND gate
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Question # 7
In simple harmonic motion we have the conservation of.
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K.E.
P.E
Total energy
Electrical energy
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Question # 8
Absolute P.E. of a body can be calculated
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At centre of the earth
Below centre of the earth
From surface of the earth
Below surface of the earth
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Question # 9
Mean life of a radioactive sample is 100 s its half life will be
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0.693 s
1 s
6.93 s
69.3 s
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Question # 10
The electrons behave as wave because.
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They can be diffracted by a crystal
They can be defecting by magnetic field
They can be deflecting by electric field
they can produce ions in gases
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Question # 11
LASER beam my be measure very large distance because it is.
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Inidirectional
coherent
Monochromatic
Not absorbed
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Question # 12
The unit of magnetic induction is.
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weber -metre
weber -metre 2
weber-meter-2
weber-metre-1
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Question # 13
Who is generally credited with the invention of first optical microscope.
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Hans Lippershery
Glavanni faber
Galileo
issac Newton
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Question # 14
In an elastic collision
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K.E. is conserved
Both K.E. and momentum are conserved
K.E. is not conserved
Only momentum is conserved
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Question # 15
The binding energy per nucleon for uranium is about.
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7.7 MeV
9.6 MeV
13.6 MeV
21.6 MeV
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Question # 16
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 # 17
Two pure inductors each of self inductance L are connected in parallel The total inductance of the combination is.
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L
2L
L/2
L/4
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Question # 18
The special theory of relativity was presented by
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Albert Einstein
Newton
Maxwell
Planck
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Question # 19
The bunding energy per nucleon for iron is.
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zero
Maximum
Negative
Minimum
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Question # 20
Why danger signals are made red.
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Our eyes are more sensitive to real colour
Red colour has minimum scattering
Red colour has maximum scattering
Red colour has maximum frequency
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Question # 21
Electromagnetic waves transmit.
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Energy only
Momentum only
Energy and momentum
Light
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Question # 22
Which of the following is nearly monochromatic
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Light from sodium lamp
Light from candle
Light from gas lamp
Light from sun
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Question # 23
Why are charged capacitors dangerous.
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They can leak a harmful chemicals
They can cause loss of vision
They can release a lethal charge
They can release gama rays.
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Question # 24
A straight copper wire a moved in a uniform magnetic field such that it cuts the magnetic lines of force then.
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emf will not be induced
emf will beinduced
sometimes emf will be induced and sometimes not
The number of turns iin the coil increases
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Question # 25
Electromotive force is closely related to.
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Inductance
Magnetic flux density
Potential difference
Electric field intensity
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Question # 26
Which temperature is the absolute measure of temperature.
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Thermodynamic temperature
Freezing point
Boiling point
Absolute zero
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Question # 27
When heat a supplied to a metallic sphere which one of the following changes will occur.
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the mass of the sphere increases
The volume of the sphere increases
The density of the sphere increases
The internal energy of the sphere increases
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Question # 28
If an elevator is moving vertically up with an acceleration 'a' the force exerted on the floor by a passing of mass 'm' is
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Ma
Mg
M(g +a)
M (g-a)
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Question # 29
When two point charges of equal magnitude and opposite sign exist very close to one another the arrangement is called.
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An electric dipole
An amperian current
A null charge
A neutral source
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Question # 30
The current passing through the coil of a galvanometer is directly proportional to
Choose an answer
Resistance
voltage
Angle of deflection
conductance
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Question # 31
How eddy current losses are reduced in A F and R F transformers.
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By using air cores
By using shell cores
By using laminated cores
By using ferrite cores
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