Question 2 :
State whether given statement is True or False :<br/>Sound from outer space adds to the noise pollution on the earth.<br/>
Question 3 :
State whether given statement is True or False<br/>Both Noise and Music when very loud can be damaging to human ears.<br/>
Question 4 :
The property of ultrasonic waves used in manufacturing emulsion for photographic films is its, _____________
Question 5 :
Unpleasant sound : Noise : : Pleasant sound :______. Fill in the blank. 
Question 7 :
While travelling by train, when the train passes through the tunnel, why does our ear aches ?
Question 8 : <p>Three different vibrating bodies produce three types of sounds X, Y and Z. Sounds X and Y cannot be heared by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in for monitoring nuclear reactor.The sound similar to that which is produced during an earthquake before the main shock wave is generated. What type of sounds are (i) X (ii) Y, and (iii) Z?</p>
Question 11 :
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 12 :
Which of the following is not caused due to noise pollution?
Question 14 :
To reduce noise pollution, which of the following devices must be installed on the vehicles ?
Question 15 :
Assertion: Ultrasonic waves are longitudinal waves of frequency grater than $20,000 Hz$
Reason: The maximum frequency of audible sound waves is $20,000 Hz$
Question 18 : <p>Which of the following measure can be taken to control noise pollution in our surroundings.</p>
Question 19 :
Fill in the blank.Loudness of a sound is proportional to ______ of the amplitude of the vibration producing the sound.
Question 22 :
The amplitude of vibration and its frequency can changed suddenly in a :
Question 24 :
Some animals get disturbed and start running here and there just before the earthquakes occur because they can hear______________?
Question 25 :
The frequency of a wave is $5\;Hz$. Then the wave is a/an (type of wave)
Question 26 :
Human ears can sense sound wave travelling in air having wavelength of ................... .<br>
Question 28 :
Presence of excessive or unwanted sounds in the environment is called 
Question 29 : <p>Which of the following frequency of sound can be heard by a dog but not by a man?</p>
Question 34 : <p>If pitch of a sound is pleasing to our ears, the sound is:</p>
Question 35 :
Trees must be removed from the road sides and around buildings to reduce the harmful effects of noise pollution.
Question 36 :
State whether given statement is True or False :<br/>Music for one person can be noise to others.
Question 37 :
The sounds having frequency less than 20 Hz are called ultrasonics.<br/>
Question 40 : <p>Fill in the blanks:</p><p>1) Perceived fundamental frequency of sound = ?<br/></p><p>2) Quality of sound = ?<br/></p>
Question 42 :
The amplitude of vibration and its frequency can change suddenly in a:
Question 44 :
The loudness or softness of a sound is determined basically by ________.
Question 45 :
What is the approximate range of audible sound frequencies for a human with good hearing?
Question 46 :
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 47 : <p>Which of the following is not a characteristic of a musical sound?</p>
Question 48 :
State whether given statement is True or False<br/>Water animals are also subjected to noise pollution.<br/>
