Question 4 :
<p>Which of the following measure can be taken to control noise pollution in our surroundings.</p>

Question 7 :
Which of the following is not caused due to noise pollution?

Question 8 :
To reduce noise pollution, which of the following devices must be installed on the vehicles ?

Question 9 :
Which of the following are true for noise pollution?<br/>a)&#160;Noise pollution is unpleasant and discomforting.<br/>b)&#160;Noise pollution can cause health problems.<br/>c)&#160;Long term exposure to loud noises can cause temporary or ever&#160;permanent hearing impairment.d)&#160;Noise pollution is caused by extremely loud sounds.

Question 13 :
Presence of excessive or unwanted sounds in the environment is called&#160;

Question 14 :
State whether given statement is True or False<br/>Noise pollution can cause partial hearing impairment. <br/>

Question 16 :
State whether given statement is True or False :<br/>Sound from outer space adds to the noise pollution on the earth.<br/>

Question 17 :
Which of the following is / are effective for preventing noise pollution?<br/>

Question 18 :
State whether given statement is True or False<br/>Water animals are also subjected to noise pollution.<br/>

Question 19 :
Trees must be removed from the road sides and around buildings to reduce the harmful effects of noise pollution.

Question 20 :
Select the odd one out (loudspeakers, aeroplanes, vacuum cleaners, ear plugs)

Question 21 :
Assertion: The quality of sound and pitch remain the same when the closed end or a pipe is suddenly opened. Reason: When the closed end is opened the pitch is doubled and the quality becomes changed.

Question 23 :
When we hear a sound, we can identify it source from

Question 26 :
State whether the given statement is True or False :<br/>The part of the ear is damaged most easily by continued exposure to loud noise is stirrup.

Question 27 :
If a vibrator strikes the water $50$ times in $5s$, then the frequency of wave is

Question 28 :
Name the instruments for which more than one part is responsible for the production of sound.

Question 30 :
Echocardiography is used to diagnose heart diseases which utilises infrasonic waves.