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Home Questions & Answer Science Questions & Answers Physics Questions & Answers

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

Electric current in a metal wire is due to the flow of:
AProtons
BElectrons

CIons
DNone of these

The emitter of a transistor is generally doped the heaviest because it:
AHas to dissipate maximum power
BHas to supply the majority charge carriers to the base

CIs the first region of the transistor
DMust 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
A(AB)/(A+C)

Which of the following is an intensive property of a thermodynamic system
AVolume
BTemperature

CMass
DEnergy

A transformer does not change the following
AFrequency

BVoltage
CWaveform
DBoth 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
AViscosity
BAdhesion
CSurface tension

DCapillary

Safety of electric appliances and wiring is ensured by
AInsulation

BEarthing
CProviding a fuse wire in the electric circuit
DAll of the above

The thickness of a light gauge sheet steel carl be best checked with
AFinely divided steel scale
BDepth Gauge
CVernier calipers

DMicrometer

A man getting down a running bus falls forward because
ADue to inertia of rest, road is left behind and man reaches forward
BDue 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

CHe leant forward as a matter of habit
DOf the combined effect of all the three factori stated in (A), (B), (C)

A virtual image larger than the object can be obtained by
AConcave Mirror
BConvex Mirror

CPlant Mirror
DConcave Lens

A Voltmeter is
AA Galvanometer with low resistance

BAn Ammeter with low resistance
CA Galvanometer with high resistance
DAn 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
APrismatic compass
BTacheometer
CSextant
DPentaprism

While taking measurement using vernier callipers, zero error is always ____ from measured length
AAlgebraically subtracted
BIgnored
CAlgebraically added

DMultiplied by 2 and then algebraically

In P-type semiconductors, conduction of electricity is due to
AMotion of holes

BMotion of negative charges
CMotion of electrons
DMotion of electrons and holes

SI unit of thermal conductivity is
AMetre - kelvin/watt
BWatt/metre - kelvin
CWatt/(metre)2 kelvin

DKelvin/watt - metre

A transistor cannot be used as
AAmplifier
BRectifier

COscillator
DBoth (and (C)

When a body is deformed, the elastic potential energy of the body is equal to
A1/2 X (stress)2
B1/2 X stress X (strain)2 X volume
C1/2 X stress X strain X (volume)2
D1/2 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
AEddy current

BSecondary current

A Hartley Oscillator is used for generating
AVery low frequency oscillations
BRadio-frequency oscillations

CMicrowave oscillations
DAudio frequency oscillations

Neap tides has_________ amplitude
AHighest
BLowest
CMedium

DNone of the above

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