Skip to content
CNMS ICSE - 7 Std
Share
Explore

Fill in the Blanks

Prepared by: learnloophq@gmail.com

Chapter: 06. Sound

⁠
Sound is a form of energy that produces the sensation of _ _ _ _ _ _ _ _ _ _ _ _ _ _ in our ears.
hearing
The to and fro or back and forth motion of an object in a fixed pattern about its mean position is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ motion.
vibratory
A tuning fork is a U-shaped steel instrument where its two arms are called prongs and the handle is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
stem
Human beings produce voice sounds with the help of an organ called the larynx or _ _ _ _ _ _ _ _ _ _ _ _ _ _.
voice box
A narrow slit is present between the two _ _ _ _ _ _ _ _ _ _ _ _ _ _ for the passage of air to produce sound in humans.
vocal cords
Birds produce sound when air passes through a ring of cartilage called the _ _ _ _ _ _ _ _ _ _ _ _ _ _ fixed at the lower part of their windpipes.
syrinx
Fish are able to produce sound when they vibrate their _ _ _ _ _ _ _ _ _ _ _ _ _ _.
air bladders
The air trapped inside the hollow body of a stringed instrument forms an _ _ _ _ _ _ _ _ _ _ _ _ _ _ which enhances the sound.
air column
Instruments like the harmonium, trumpet, and mouth organ produce sound when air is blown through their _ _ _ _ _ _ _ _ _ _ _ _ _ _.
metal reeds
When a sound wave moves through a medium, there is a transfer of energy, but absolutely no transfer of _ _ _ _ _ _ _ _ _ _ _ _ _ _.
matter
Wavelength is represented along the x-axis by the Greek letter _ _ _ _ _ _ _ _ _ _ _ _ _ _.
lambda (λ)
The SI unit of frequency is the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
hertz (Hz)
The maximum displacement of a wave on either side of its mean position is called its _ _ _ _ _ _ _ _ _ _ _ _ _ _.
amplitude
The loudness of a sound is directly proportional to the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the amplitude of vibration.
square
The characteristic of sound which determines its shrillness is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.
pitch
Sound cannot travel through a _ _ _ _ _ _ _ _ _ _ _ _ _ _ because there are no material particles present to transmit the wave.
vacuum
In the 17th century, the French scientist and philosopher _ _ _ _ _ _ _ _ _ _ _ _ _ _ made the earliest known attempt to measure the speed of sound in air.
Pierre Gassendi
The speed of sound in steel is approximately _ _ _ _ _ _ _ _ _ _ _ _ _ _ meters per second.
5100
Sound waves bounce back upon striking a surface, a process known as the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of sound.
reflection
To hear an echo clearly, the reflecting surface must be located at a minimum distance of _ _ _ _ _ _ _ _ _ _ _ _ _ _ meters from the source.
17
The human ear can only perceive sounds produced by vibrations within the audible frequency range of _ _ _ _ _ _ _ _ _ _ _ _ _ _ Hz to 20,000 Hz.
20
Sounds of frequencies higher than 20,000 Hz are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ sounds.
ultrasonic
A special device called _ _ _ _ _ _ _ _ _ _ _ _ _ _ was invented by Thomas Alva Edison to record and playback sound.
phonograph
Gallery
 
Want to print your doc?
This is not the way.
Try clicking the ··· in the right corner or using a keyboard shortcut (
CtrlP
) instead.