Class IX Science Test on 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

• 25k 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:

• 0.2 s

• 1s

• 2s

• 0.1 s

Speed (v) abs wavelength (λ) and the frequency (v) of sound are related as

• λ= v X v

• v= λ X v

• v= λ X v

• v= λ / v

Speed of sound depends upon

• Temperature of the medium

• Pressure of the medium

• Temperature of source producing sound

• Temperature and pressure of medium

Which characteristic is this? We can distinguish between sound having same pitch and loudness.

• Tone

• Note

• Pitch

• Timber

Loud sound can travel a larger distance, due to

• Higher amplitude

• Higher energy

• High frequency

• High speed

A wave in slinky travelled two and fro in 5 sec the length of the slinky is 5m. What is the velocity of wave?

• 10m.s

• 5m/s

• 2m/s

• 25m/s