Available Answers

1. 1.

   Multiple Choice Questions

   Tick (√) the correct option:

   1. Which characteristics of sound distinguishe between a man's and a woman's voice?
      1. Loudness
      2. Time period
      3. Pitch
      4. Amplitude
   2. Frequency of sonic sound is
      1. 20 Hz to 20,000Hz
      2. Above 20,000Hz
      3. Below 20 Hz
      4. None of the above
   3. Sound travels fastest in
      1. solids
      2. gases
      3. liquids
      4. vacuum
   4. Vibrating object in wind instruments is
      1. wire
      2. membrane
      3. air column
      4. string
   5. Inaudible sounds include
      1. infrasonic sound
      2. ultrasonic sound
      3. sonic sound
      4. both (a) and (b)
   6. The vibrating body transfers its ________________ to adjacent molecules in the medium
      1. energy
      2. molecules
      3. atoms
      4. ions
   7. Speed of sound depends on
      1. physical state
      2. temperature of material
      3. nature of material
      4. all of the above
   8. Basic requirements for sound to be produced ant propagated are
      1. a vibrating body
      2. a material medium
      3. (a) and (b) both
      4. None
   9. Which of the following acts as sound absorber?
      1. Automobiles
      2. Trees
      3. Heavy machines
      4. Loudspeakers
   10. The ear has a stretched membrane called
       1. eardrum
       2. anvil
       3. hammer
       4. stirrup
2. 2.

   Fill in the blanks:

   1. Sound is produced when a body ____________.
   2. Sound requires a ____________ to travel.
   3. We hear sounds with frequencies between ____________ Hz and Hz.
   4. A sound with frequency less than 20 Hz is called ____________.
   5. The loudness of a sound depends on the of the ____________ vibration.
   6. The number of vibrations per second is called ____________.
   7. Sound travels fastest in ____________ and least in ____________.
   8. Irregular vibrations produce ____________.
   9. The loudness of sound is measured in ____________.
   10. Frequency is measured in ______________.
3. 3.

   Tick (√) the correct and cross (X) the wrong statement:

   1. The distance travelled by an oscillating object during one oscillation is called amplitude.
   2. The number of vibrations produced by a vibrating body in one second is called the frequency.
   3. The SI unit of time is Hertz.
   4. Sound above 20,000 Hz is called infrasonic.
   5. Loudness of a sound depends on the amplitude of the vibrating object.
   6. Pitch depends on the amplitude of the vibrating object.
4. 4.

   Match the following:

   Column A	Column B
   1. Stringed instrument	(a) Flute
   2. Percussion instrument	(b) Guitar
   3. Wind instrument	(c) Tabla

    

5. 5.

   Find the odd one out:

   1. Guitar, Sitar, Violin, Tabla.
   2. Sonic, Ultrasonic, Amplitude, Infrasonic.
6. 6.

   What is the SI unit of frequency?