When we change a feeble sound to a loud sound, we increase its:

A. frequency B. amplitude

C. velocity D. wave length

Draw a neat and labelled diagram of the human ear. With the help of this diagram, explain the construction and working of the human ear.

In SONAR we use:

A. ultrasonic waves

B. infrasonic waves

C. radio waves

D. audible sound waves

Which kind of sound is produced in an earthquake before the main shock wave begins?

A. ultrasound B. infrasound

C. audible sound

D. none of the above

Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting:

A. intensity of sound only

B. amplitude of sound only

C. frequency of the sitar string with the frequency of other musical instruments

D. loudness of sound