Question 2 :
The property of ultrasonic waves used in manufacturing emulsion for photographic films is its, _____________
Question 3 :
Human ears can sense sound wave travelling in air having wavelength of ................... .<br>
Question 6 :
State whether given statement is True or False<br/>Water animals are also subjected to noise pollution.<br/>
Question 8 :
State whether given statement is True or False<br/>Both Noise and Music when very loud can be damaging to human ears.<br/>
Question 10 :
State whether given statement is True or False<br/>Noise pollution can cause partial hearing impairment. <br/>
Question 11 :
<p>Which of the following frequency of sound can be heard by a dog but not by a man?</p>
Question 13 :
Presence of excessive or unwanted sounds in the environment is called 
Question 15 :
Assertion: Ultrasonic waves are longitudinal waves of frequency greater than 20,000 Hz.
Reason: The maximum frequency of audible sound waves is 20,000 Hz.
Question 16 :
Select the odd one out (loudspeakers, aeroplanes, vacuum cleaners, ear plugs)
Question 17 :
<p>If pitch of a sound is pleasing to our ears, the sound is:</p>
Question 19 :
Which of the following is not caused due to noise pollution?
Question 22 :
A transverse wave of frequency 100 Hz passes through water. The refractive index of water is 1.33, what will be the frequency of the wave in water
Question 23 :
The membrane of a drum vibrates to produce sound. Similarly the string of a sitar vibrates to produce sound. Based on these two examples answer the following question. Which part of a whistle vibrates to produce sound?
Question 25 :
If speed of infrasonics, audible and ultrasonics waves are $v_i, v_a$ and $v_u$ then.