Class IX

Children under the age of 5 can hear upto
  1. 25 Hz
  2. 25k Hz
  3. 20 Hz
  4. 25 kHz
Speed (v) abs wavelength ( �) and the frequency (v) of sound are related as
  1. λ= v X v
  2. v= λ X v
  3. v= λ X v
  4. v= λ / v
Which part of human ear converts sound vibrations into electrical signals
  1. Hammer
  2. Stirrup
  3. Tympanic membrane
  4. Cochlea
What do dolphins, bats and porpoise use
  1. Ultrasound
  2. Infrasound
  3. Both a and b
  4. None of these
To hear a distinct echo each time interval between the original sound and the reflected sound must be:
  1. 0.2s
  2. 1s
  3. 2s
  4. 0.1s
Time Elapsed

HR : MIN : SEC
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