Physics Questions & Answers (Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)

Electric current in a metal wire is due to the flow of:
Protons
Electrons
Ions
None of these

The emitter of a transistor is generally doped the heaviest because it:
Has to dissipate maximum power
Has to supply the majority charge carriers to the base
Is the first region of the transistor
Must possess low resistance

A bullet of mass A and velocity B is fired into a block of wood of mass C. It loss of any mas and friction be neglected, what is the end velocity of the system
(AB)/(A+C)
(AC)/(B+C)
(A+C)/(BC)
(A+B)/AC

Which of the following is an intensive property of a thermodynamic system
Volume
Temperature
Mass
Energy

A transformer does not change the following
Frequency
Voltage
Waveform
Both frequency and waveform

The property of the liquid surface film to exert a tension so that even small loads can be supported over it is known as
Viscosity
Adhesion
Surface tension
Capillary

Safety of electric appliances and wiring is ensured by
Insulation
Earthing
Providing a fuse wire in the electric circuit
All of the above

The thickness of a light gauge sheet steel carl be best checked with
Finely divided steel scale
Depth Gauge
Vernier calipers
Micrometer

A man getting down a running bus falls forward because
Due to inertia of rest, road is left behind and man reaches forward
Due to inertia of motion upper part of body continues to be in motion in forward direction while feet come to rest as soon as they touch the road
He leant forward as a matter of habit
Of the combined effect of all the three factori stated in (A), (B), (C)

A virtual image larger than the object can be obtained by
Concave Mirror
Convex Mirror
Plant Mirror
Concave Lens

A Voltmeter is
A Galvanometer with low resistance
An Ammeter with low resistance
A Galvanometer with high resistance
An Ammeter with high resistance

The surveying instrument which is used for rapid measurements ot distance to target, which operates electronically or electro-optically and measures distance indirectly, is
Prismatic compass
Tacheometer
Sextant
Pentaprism

While taking measurement using vernier callipers, zero error is always ____ from measured length
Algebraically subtracted
Ignored
Algebraically added
Multiplied by 2 and then algebraically

In P-type semiconductors, conduction of electricity is due to
Motion of holes
Motion of negative charges
Motion of electrons
Motion of electrons and holes

SI unit of thermal conductivity is
Metre - kelvin/watt
Watt/metre - kelvin
Watt/(metre)2 kelvin
Kelvin/watt - metre

A transistor cannot be used as
Amplifier
Rectifier
Oscillator
Both (and (C)

When a body is deformed, the elastic potential energy of the body is equal to
1/2 X (stress)2
1/2 X stress X (strain)2 X volume
1/2 X stress X strain X (volume)2
1/2 X stress X strain X volume

Electric current induced within conductors by a changing magnetic field in the conductor, which flow in closed loops within conductors, is known as
Eddy current
Secondary current

A Hartley Oscillator is used for generating
Very low frequency oscillations
Radio-frequency oscillations
Microwave oscillations
Audio frequency oscillations

Neap tides has_________ amplitude
Highest
Lowest
Medium
None of the above

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Physics Question Answers, PSC, UPSC, IBPS, SSC Previous Papers