MEDIUM
8th CBSE
IMPORTANT
Earn 100

Follow the clues and solve the terms you have learned. 

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CROSSWORD
Follow the clues and solve the terms you have learned.

Across:
1. A thin, tightly stretched membrane inside the ear, which vibrates due to sound waves.
4. A unit used to measure the loudness of a sound.
8. A space that is completely empty of all substances, including air.


Down:
2. Pleasant sound produced by continuous and regular vibrations of a musical instrument, as opposed to noise. 
3. The degree of highness or lowness of a tone.
5. The back and forth motion of an object about a mean position.
6. The tube in the throat that carries air to the lungs. 

Important Questions on Sound

EASY
8th CBSE
IMPORTANT
_____ is the SI unit of frequency.
EASY
8th CBSE
IMPORTANT
In humans, the vibration of the _____ (neck / vocal cords) produces sound.
EASY
8th CBSE
IMPORTANT
In humans, the _____ (outer/middle/inner)ear sends sound signals to the brain, which enables us to hear.
EASY
8th CBSE
IMPORTANT
The vocal cords in men are about _____ (50 mm/20 mm) long.
EASY
8th CBSE
IMPORTANT

Fewer trees would mean _____ sound will reach the residents.

(Choose from the following: more/ less)

EASY
8th CBSE
IMPORTANT
Hearing loss may result in _____ (defective/ better) speech.
EASY
8th CBSE
IMPORTANT
The frequency of a body making 200 vibrations per second is _____ Hz.
EASY
8th CBSE
IMPORTANT

Sound cannot travel in _____.

(Choose from: gases/vacuum)