Science Physics MCQ-165

General Science-Physics Practice Questions for CDS, DelhiPolice, SSC, CivilsPrelims, UPPSC, RBI, NDA, UPSC Exams

Consider the following statements
1. In sound waves, the vibrations are perpendicular to the direction in which the wave travels.
2. Sound waves are elastic waves. Which of the statement(s) given above is/are correct?


When an aero plane attains a speed higher than the speed of sound in air a loud bang is heard, this is because


When a source of sound is in motion towards a stationary observer, the effect observed is


Speed of sound in a gas is proportional to


Red shifts is an illustration of


Ultrasonic waves are used for stirring liquid solutions because they


Sound waves in air are … waves.


Sound waves of wavelength greater than that of audible sound are called


The waves moving from a sitar to a listener in air are


If vm is the velocity of sound in moist air and vd is the velocity of sound in dry air, then


In vacuum, the speed of light


What is pulse?


A progressive wave or travelling wave


Velocity of wave in a string (thread) is


Which is the correct order of wave lengths of wave


Identify the correct order of velocity (speed) of sound, given

Vo2 = Velocity of Sound in O2 -gas
VN2 = Velocity of sound in N2 gas
V H2 = Velocity of sound in H2-gas
vcl2 = Velocity of sound in CI2-gas


In an electromagnetic wave,

1 . electric field and magnetic field are parallel to each other .
2 . electric field and magnetic field are per perpendicular to each other .
3 . electric field and magnetic field both are perpendicular to direction to propagation of wave .


Two men are standing at a distance of 100 m. In the middle of the distance between them the 10m gap is vacuum, one calls another (second)


The temperature of boiling water in steam engine may be high because


The energy that can harness heat stored below the earth’s surface is known as


The wavelength of the radiation emitted by a body depends upon


At upper atmosphere, an astronaut feels


Which colour of heat radiation represents the highest temperature?


which of the following is the best conductor of the heat?


What is the principle by which a cooling system (Radiator) in a motor car works?