1) Dholak
2) Sitar
Distinguish between audible and inaudible sound by giving one point
of difference each.
(01)
Presence of excessive or unwanted sounds in the environment is
called noise pollution.
(02)
Write any two causes of noise pollution.
State any two measures to reduce noise pollution.
Tap water is a good conductor of electricity. Give reason.
(01)
Draw a neat diagram using a battery, two copper plates and copper
sulphate solution to show the process of electroplating.
(02)
(01
TA. Match the effects of electric current from Column A with its
Applications given in Column B.
Column A
Column B
1. Heating effect a. Electroplating
2. Chemical effect b. Ceiling fan
c. Electric iron
Answers
Explanation:
Dholak: Dholak has stretched membranes that vibrate to produce sound.
Sitar: In sitar, the stretched strings, when vibrate, they produce sound.
01 . Audible sound - The audible range of sound for human being exchange from about 20 Hertz to 20000 Hertz.
Inaudible sound - The frequency which is below 20 Hertz aur in audible which is also called as infrasonic sound or infrasound.
02 cause of noise pollution
Traffic noise.
Air traffic noise.
Construction sites.
The measures to control noise pollution are:
(a) Reduction of noise can be brought by the use of sound absorbent materials or by muffling noise.
(b) Delimitation of horn-free zones around hospitals and schools.
(c) Growing of more plants can also minimize the noise pollution.
01 This is because water itself isn't a conductor. However, when one dissolves ionic compound such as salts, the ions becomes loosely bound to each other which makes tap water a good conductor of electricity.
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