Class IX

  In gases a sound wave is
  1. Transverse only
  2. Longitudinal only
  3. Both Transverse and Longitudinal
  4. Neither Transverse Nor Longitudinal
 The product of time-period and frequency is
  1. Zero
  2. Unity
  3. Iinfinity
  4. None of these
Which part of human ear converts sound vibrations into electrical signals
  1. Hammer
  2. Stirrup
  3. Tympanic membrane
  4. Cochlea
The number of oscillations completed in one second is called .
  1. Time period
  2. Velocity
  3. Frequency
  4. Wavelength
 The time period of a simple pendulum in a spacecraft orbiting the earth is
  1.  Zero
  2.  One second
  3. Infinity
  4. Two seconds
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