The range of audible frequencies is
20 to 20,000Hz
less than 20 Hz
higher than 20,000 Hz
none of these.
Which of the following statements is correct?
Sound can travel through vacuum but light cannot
Sound needs medium, but light doesn't needs medium for its propagation
Sound and light both require medium for propogation
Sound and light both cannot travel in a medium
Unwanted sounds are called
Noise.
Music.
Loudness.
None of these.
The time taken by an object to complete one oscillation is called
Frequency.
Time period.
Amplitude.
Sound levels are measured in
Decimetres
Decibels
Decilitres
Decigrams
Which vibrating part of flute producing sound?
Stretched rubber sheet.
Air column.
Stretched string.
What is the vibrating part of the musical instrument Tabla?
Stretched membrane.
Which of the following statements is not a use of ultrasound?
Ultrasonic treatment of tumors in patients suffering from cancer.
Ultrasonic scanning during pregnancy to check the development of baby.
Ultrasonic cleaning to remove coating of tartar from teeth.
Ultrasound for echo location to determine the depth of water.
The amplitude of vibration and its frequency can change suddenly in a
Pitch
Musical sound
Noise
All of the these
Mohan fires a gun 150 m from a cliff. His friend Sohan who is standing 300 m further away from the cliff hears the gun 1 second after he sees the flash.
Sohan will hear the echo from the cliff
1 second after seeing the flash
2 seconds after hearing the gun
2 seconds after seeing the flash
4 seconds after hearing the gun
