Sound

Which part of human ear converts sound vibrations into electrical signals

• Hammer

          

• Stirrup

• Tympanic membrane

• Cochlea

What do dolphins, bats and porpoise use

• Ultrasound

         

• Infrasound

• Both a and b

• None of them

Children under the age of 5 can hear upto

• 25 Hz

          

• 20k Hz

• 20 Hz

• 25 kHz

 Reverberation of sound is used in

• Stethoscope    

• Trumpets

• Megaphone

• All of these

To hear a distinct echo each time interval between the original sound and the reflected sound must be:

• 0.2s

• 1s

• 2s

• 0.1 s

Pitch of sound is higher when

• Vibration of the source of sound is higher

• Vibration of the source of sound is Lower

• Independent of vibration of the source of sound

• None of these

Loudness and softness of sound depend upon

• Frequency of sound

• Amplitude of sound

• Wavelength of sound

• None of these

Sound of single frequency is called

• Note

• Tone

• Noise

• None of these

Determine which of the following has a higher pitch railway horn or guitar?

If we strike a table lightly, we hear a soft sound. If we hit the table hard we hear a louder sound up to a large distance. Why?