2.
Lightening is seen before thunder is heard because
3.
Pendulum oscillates with frequency of 10 Hz. Its time period is
4.
The decibel is a unit that measured
5.
Women are high pitched because their vocal cords are
6.
Sound travels with maximum speed in
7.
While tightening the membrane of the table, its pitch
8.
Frequency less than20 hertz are known as
9.
For propagation sound needs a
10.
The maximum displacement of a vibrating object from its position of rest is called the
11.
The frequency of ultrasonic sound is
12.
The pitch of a female rather than a man is
13.
A child’s squeaky toy sounds louder in a tub of water than air
14.
Sound can’t travel through vacuum because of
15.
Number of bones are present in the middle ear
16.
If a violin string is pulled strongly its amplitude of vibration increases. Which characteristic of sound produced changed here?
17.
If an object oscillates 30 times in two seconds what would be its time period
18.
The other name of voice box is
19.
The part is vibrating of mridangam is
20.
Sound can’t be produced without
22.
How noise pollution can be reduced in the residential area?
23.
A sound from a mosquito is produces when it vibrates its wings at an average rate of 500 vibrations per second. It is
24.
If amplitude of a vibrating object becomes double how does the loudness of sound change?
25.
If a body vibrates 9 times in 3 seconds. The time period is
26.
Multiple reflection of sound is called
27.
How can we reduce sound in cinema hall?
28.
In human ear sound energy is converted into
29.
The time is taken for a vibration to repeat is called its
30.
The pitch of the sound depends on its
