Sound

What is/are the causes of pollution?
1. crackers
2. machines
3. loudspeakers
4. all of the above
What are the problems caused by noise?
1. anxiety
2. lack of sleep
3. hypertension
4. all of the above
Loudness is expressed in unit
1. hertz
2. pascals
3. decibel
4. bytes
Audible frequency range in humans is-
1. 200-20,0000Hz
2. 20-20,0000Hz
3. 20-20,000Hz
4. 2-20,000Hz
The sound in humans is produced by-
1. pharynx
2. larynx
3. wind pipe
4. none of the above
The to and fro motion of an object is called-
1. vibrating motion
2. oscillating motion
3. both (a) and (b)
4. none of these
Sound can travel through
1. gases only
2. solids only
3. liquids only
4. solids,liquid and gases
Voice of which of the following is likely to have minimum frequency?
1. baby girl
2. baby boy
3. a man
4. a woman
Which part vibrates to produce sound in Sitar?
1. membrane
2. air column
3. string
4. reeds
Which instrument works on air column?
1. tabla
2. veena
3. guitar
4. flute