Available Answers

1. 1.

   Write true or false for each statement:

   1. Sound can travel in vacuum.
   2. Sound is a form of energy.
   3. Sound can only be produced by vibrating bodies.
   4. Larger is the amplitude, feeble is the sound.
   5. The frequency is measured in hertz.
   6. Loudness depends on frequency.
   7. Waveforms of two different stringed instruments can be the same.
   8. Female voice is shriller than the male voice.
   9. A ticking clock sound is heard late when heard through a metal.
2. 2.

   Fill in the blanks:

   1. Sound is produced when a body ____________.
   2. The number of times a body vibrates in one second is called its ____________.
   3. The pitch of a sound depends on its ____________.
   4. Sound can travel in ____________.
   5. We can hear sounds of frequency in the range of ____________.
   6. Sound requires a ____________ for propagation.
   7. Sounds travels Faster in ____________than in liquids.
   8. The sound heard after reflection is ____________.
   9. ____________ produces sensation in ears.
3. 3.

   Match the following:

   Column A	Column B
   Vibrations cause  A shriller sound is  Unit of frequency  Unit of time period  Curtains	absorb sound second sound of high pitch  hertz

4. 4.

   Select the correct alternative:

   1. We can distinguish a shrill sound from a flat sound by its:
   2.  We can hear sound of frequency:
   3. Sound cannot travel in:
   4. The minimum distance required between the source and the reflector so as to hear the echo in air is:
   5. Wavelength is measured in:
   6. The speed of sound in water is:
   7. Sound travels the fastest in:
5. 5.

   What do you mean by a vibratory motion?

6. 6.

   What is sound ?