Question Text
Question 3 :
<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 9 :
What is the approximate range of audible sound frequencies for a human with good hearing?
Question 10 :
Trees must be removed from the road sides and around buildings to reduce the harmful effects of noise pollution.
Question 11 :
The grandparents and parents of two-year old girl are playing with her in a room. A sound source produces a $28 kHz$ sound. Who in the room is most likely to hear the sound?
Question 12 :
The sound waves which cannot be heard by a human ear are called.
Question 13 :
<p>Before playing the orchestra in a musical concert, sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting:</p>
Question 14 :
The up-down motion around the mean position of an object is called
Question 15 :
In the following statements , tick (T) against those which are true , and False against those which are false :<br>Sound generate due to vibration in objects.