English Medium इयत्ता ९ - CBSE Question Bank Solutions

Name the characteristic of sound which depends on (a) amplitude (b) frequency, and (c) waveform.

Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).

What type of scans are used these days to monitor the growth of developing baby in the uterus of the mother ?

What is the name of the device which is used to find the depth of sea (or ocean) by using ultrasonic sound waves ?

Fill in the blank with suitable word : 
 Pitch of sound depends on ....................

Fill in the blank with suitable word : 
Loudness of sound depends on .....................

Fill in the blank with suitable word : 
Quality of sound depends on ........................

What is meant by the 'loudness' of sound ? On what factor does the loudness of a sound depend ?

Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.

Explain the term 'pitch' of a sound. On what factor does the 'pitch' of a sound depend ?

Draw labelled diagrams to represent sound of (a) low pitch, and (b) high pitch, of the same loudness.

What is meant by the quality (or timbre) of sound ? On what factor does the quality (or timbre) of a sound depend ?

Explain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.