Class VIII

The sound above _ is physically painful . 
  1. 20 dB 
  2. 40 dB 
  3. 60 dB 
  4. 80 dB 
The sound above ___ is physically painful
  1. 20 dB
  2. 40 dB
  3. 60 dB
  4. 80 dB
The hearing range of human ear is
  1. 20 Hz to 20,000 Hz
  2. Less than20 Hz
  3. More than 20,000 Hz
  4. 20 Hz to 25,000 Hz
The pitch of sound depends on the _ of the vibrating body . 
  1. Amplitude 
  2. Noise 
  3. Frequency 
  4. Medium of propagation 
Sound propagates maximum in
  1. Gas
  2. Liquid
  3. Solid
  4. All
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