Class VII

Sounds of traffic, aircrafts and machines are called
  1. artificial sounds
  2. natural sounds
  3. man-made sounds
  4. noise
When sound waves reach our ear, we hear them as
  1. light waves
  2. electronic waves
  3. sound waves
  4. thermal waves
Louder sound, more
  1. wave front
  2. wavelength
  3. energy
  4. frequency
Length of air cutting is changed by
  1. valves
  2. fingers
  3. valves and fingers
  4. length
Sound of a whistle is
  1. low pitched
  2. high pitched
  3. low pitched with short wavelengths
  4. high pitched with long wavelengths
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