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

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

Which unit we use to express Nuclear sizes ?
ATesla
BNewton
CFermi

DNone of above

The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called
ANuclear fusion
BNuclear fission

CNuclear reaction
DFast breeding

Which of following in not a property of cathode ray.
ACathode rays are invisible and travel in a straight line.
BThese rays can ionise gases.
CThese rays can penetrate through thin metal foils.
DThese rays make materials cool on which they fall.

Atom is the smallest part of matter which takes part in chemical reactions.
ATrue

BFalse

Device used to measure potential difference between two points in a circuit is ?
AAmmeter
BGalvanometer
CVoltmeter

DNone of above

Which are the primary Colours ?
AYellow, Green, Blue
BRed, Magenta, Blue
CRed, Green, White
DRed, Green, Blue

The incident ray, reflected ray and normal to the reflecting surface at the incident point all never lie in same plane.
ATrue
BFalse

CAnswer And Explan

The angle of reflection is equal to the angle of incidence.
ATrue

BFalse

What is refractive index ?
Ait is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
Bit is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

Cit is defined as the product of speed of light in medium and in vacuum.
DNone of above

What is the range of mercury thermometer ?
A0 degree Celsius to 350 degree Celsius
B-10 degree Celsius to 350 degree Celsius
C-20 degree Celsius to 350 degree Celsius
D-30 degree Celsius to 350 degree Celsius

What are audible sound waves ?
AHaving frequency less than 20 Hz
BHaving frequency between 20 Hz to 20000 Hz

CHaving frequency more than 20000 Hz
DNone of above

What is the relation between wavelength, frequency and velocity ?
Avelocity of wave = frequency * wavelength

Bvelocity of wave = frequency/wavelength
Cvelocity of wave = wavelength/frequency
DNone of above

Which of the following is an electromagnetic wave ?
ACathode rays
BSound wave
CUltrasonic wave
DInfra red rays

Lognitudinal waves and Transverse waves are types of ?
AMechanical waves

BNon-Mechanical waves
CBoth of above
DNone of Above

What is the maximum value of deforming force upto which a material shows elastic property and above which the material loses it ?
AElasticity
BStrain
CElastic Limit

DStress
EAnswer And Explanation

The force which opposes the relative motion between different layers of liquid or gases is called
ACritical Velocity
BStreamline Flow
CTerminal Velocity
DViscous Force

Force of attraction between the molecules of different substances is called
ASurface tension
BCohensive force
CAdhesive force

DNone of above

When a body is immersed partly or wholly in a liquid, there is an apparent loss in weight of the body which is equal to the weight of liquid displaced by the body.
ATrue

BFalse
CAnswer And Explanation

Which is true
AIn a static liquid at same horizontal level, pressure is more at centre
BIn a static liquid at same horizontal level, pressure is less at centre.
CIn a static liquid at same horizontal level, pressure is same at all points

DIn a static liquid at same horizontal level, pressure is different at all points

Sudden fall in barometer is indication of
AStorm

BRain
CTide
DClear weather

Atmospheric pressure is measured by
ATonometer
BPyrometer
CBarometer

DThermometer

What is escape velocity ?
AEscape velocity is the maximum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
BEscape velocity is the minimum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
CEscape velocity is the minimum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.

DEscape velocity is the maximum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.

Orbital speed of a satellite is dependent of its mass.
ATrue
BFalse

All planets move around the sun in elliptical orbits, with the sun being at rest at one focus of the orbit.
ATrue

BFalse
CAnswe

If lift is going up with acceleration, the apparent weight of a body is
Amay be more or less than true weight
Bequal to the true weight
Cless than the true weight
Dmore than the true weight

Solar cell converts
ASound energy into electrical energy
BElectrical energy into mechanical energy
CSolar energy into electrical energy

DElectrical energy into light energy

Electric Motor converts
AElectrical energy into mechanical energy

BMechanical energy into Electrical energy
CElectrical energy into light energy
DNone of above

Energy posses by a body in motion is called
AKinetic Energy

BPotential Energy
CBoth of Above
DNone of Above

The rotational effect of a force on a body about an axis of rotation is described in terms of
ACentre of gravity
BCentripetal force
CCentrifugal force
DMoment of force

If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this ?
ANewton first law
BNewton second law
CNewton third law
DPrinciple of conservation of linear momentum

EAnswer And Explanation