Periodic vibrations of decreasing amplitude is called
Forced vibration.
damped vibration.
Natural vibration.
None of these .
The waves in which the particles of the medium travel in the same direction as the waves are
Linear waves
Longitudinal waves
Transverse waves
Electromagnetic waves
The speed of a sound wave in a given medium is
directly proportional to its frequency
inversely proportional to its frequency
directly proportional to the square of its frequency
independent of its frequency
Waves produced due to the earthquake are known as
seismic waves
shock waves
infrasonic waves
none of these
The SI unit of amplitude of oscillation is
cm
m
km
If the frequency of a wave is doubled, its wavelength
becomes doubled
remains same
is halved
Bats detect the obstacles in their path by receiving the reflected
Infrasonic waves .
Ultrasonic waves.
Electromagnetic waves.
Radio waves .
Echo is produced due to
reflection of sound
refraction of sound
resonance
A wave completes 24 cycles in 0.8 s. The frequency of the wave is
30 Hz
8 Hz
24 Hz
12 Hz
