Class IX

 The time period of a simple pendulum in a spacecraft orbiting the earth is
  1.  Zero
  2.  One second
  3. Infinity
  4. Two seconds
 In longitudinal waves , the particles vibrate in a direction of propagation
  1. Parallel
  2. Perpendicular
  3. Curved
  4. Both parallel and perpendicular
 Speed of sound in vacuum is
  1. 340 m/s
  2.  380m/s
  3. 600m/s
  4. 300m/s
Loud sound can travel a larger distance, due to
  1. Higher amplitude
  2. Higher energy
  3. High frequency
  4. High speed
Speed of sound depends upon
  1. Temperature of the medium
  2. Pressure of the medium
  3. Temperature of source producing sound
  4. Temperature and pressure of medium
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