Hertz is the unit of
Frequency
Wavelength
Amplitude
Displacement
Velocity of sound is
380 m/s
340 m/s
3x108 m/s
360 m/s
A projectile has maximum range when the angle of projection is
900
450
600
300
The sound produced by musical instruments in big halls may linger even after the instrument stops producing sound. This is known as
Resonance
Pitch
Echo
Reverberation
If a bucket containing water is kept revolving at a high speed in a vertical circle, the water does not spill. It gets
Centripetal force
Magnetic force
Gravitational force
None of these
The angular velocity of the minute hand of a clock is
π rad per second 180
π rad per second 1800
π rad per second 60
π rad per second 360
If the frequency of vibration is equal to the natural frequency of the body, then it is known as
Persistence of audibility
Persistence of vision
The position of a particle going along a straight line is x1 = 50 m at 10.30a.m. and x2 = 55 m at 10.35 a.m.The displacement between 10.30 a.m and 10.35 a.m. is :
2 m
5 m
7 m
9 m
A particle is travelling with a constant speed. This means that
its position remains constant as time passes
it covers equal distances in equal time intervals
its acceleration is zero
it does not change its direction of motion
The reflected sound is called
