(a)infrasonic waves
(b)radio waves
(c)electro-magnetic waves
(d)ultrasonic waves
Q2. The minimum distance between the source and the reflector, so that an echo is heard is approximately equal to ______.
(a)10 m
(b)17 m
(c)34 m
(d)50 m
Q3.When sound travels through air, the air particles ______.
(a)vibrate along the direction of wave propagation
(b)vibrate but not in any fixed direction
(c)vibrate perpendicular to the direction of wave propagation
(d)do not vibrate
Q4.Sound waves do not travel through
(a)solids
(b)liquids
(c)gases
(d)vacuum
Q5.The frequency which is not audible to the human ear is
(a)50 Hz
(b)500 Hz
(c)5000 Hz
(d)50000 Hz
Q6.Which of the following will remain unchanged when a sound wave travels in air or in water?
(a)Amplitude
(b)Wavelength
(c)Frequency
(d)Speed
Q7.Sound and light waves both
(a)have similar wavelength
(b)obey the laws of reflection
(c)travel as longitudinal waves
(d)travel through vacuum
Q8.Which of the following quantities is transferred during wave propagation?
(a)Speed
(b)Mass
(c)Matter
(d)Energy
Q9. The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called _________.
(a)reflection
(b)echo
(c)reverberation
(d)rarefaction
Q10.Vibrations inside the ear are amplified by the three bones namely the _________ in the middle ear.
(a)hammer, anvil and stirrup
(b)hammer, anvil and pinna
(c)hammer, cochlea and stirrup
(d)auditory bone, anvil and stirrup
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