Skip to content
CNMS ICSE - 7 Std
Share
Explore

Answer in one line

Prepared by: learnloophq@gmail.com

Chapter: 06. Sound

⁠
How does a plastic ruler produce a humming sound?
A plastic ruler produces a humming sound when one of its ends is held firmly on a table and the free end is flicked, causing it to vibrate rapidly.
What are the two main parts of a tuning fork?
The two main parts of a tuning fork are its two U-shaped arms called prongs and a handle called the stem.
Where is the larynx located in the human body?
The larynx lies in the throat between the pharynx and the trachea.
Why do women have a higher-pitched, shriller voice compared to men?
Women have a higher-pitched voice because their larynx is usually smaller than a man’s, resulting in tight and thin vocal cords that vibrate at a higher frequency.
How do animals like frogs and mammals produce sound?
Frogs and mammals produce sound by blowing air from their lungs through their vocal cords.
How do mosquitoes and bees make their characteristic buzzing sound?
Mosquitoes and bees produce a buzzing sound by rapidly vibrating their wings.
What are the two main structural parts of stringed instruments?
The two main structural parts of stringed instruments are a hollow body and stretched strings.
How is the frequency of each cup in a jal tarang adjusted?
The frequency of each cup in a jal tarang is adjusted by filling it with an appropriate amount of water.
What is a longitudinal wave?
A longitudinal wave is a wave in which the particles of the medium vibrate in the same direction as the propagation of the wave.
What is one oscillation of a wave?
One oscillation is the complete to and fro motion of the particles of a medium when one full wave is constituted.
What is the frequency of a wave?
The frequency is the total number of oscillations made by a wave in a unit of time.
What is the relationship between frequency and time period?
The frequency of a wave is inversely proportional to its time period, mathematically written as Frequency = 1 / Time period.
Does the loudness of sound depend on the frequency of a vibrating particle?
No, the loudness of sound does not depend upon the frequency of the vibrating particle.
How does the distance between the listener and the sound source affect the perceived loudness?
As the distance between the listener and the source of sound increases, the perceived loudness of the sound decreases.
Why can astronauts in space see each other but not hear each other speak directly?
Astronauts cannot hear each other directly because space is a vacuum and sound waves require a material medium to propagate, whereas light waves can travel through space without a medium.
Compare the approximate speed of sound in air with the speed of light in air.
The speed of sound in air is about 340 m/s, whereas the speed of light in air is vastly faster at 3 × 10^8 m/s.
Why does lightning appear before thunder is heard during a thunderstorm?
Lightning is seen before thunder is heard because light travels significantly faster than sound through air.
What is the law regarding the angles of reflection for sound?
When sound strikes a surface and reflects, the angle of incidence is equal to the angle of reflection.
What three conditions must be met for an echo to be clearly heard?
An echo requires a large reflector, a short duration original sound, and a minimum reflecting distance of 17 meters from the source.
Why are the walls, ceilings, and floors of auditoriums covered with sound-absorbing materials?
They are covered with sound-absorbing materials to prevent echoes, reduce unwanted reflections, and stop the transfer of sound to the external surroundings.
What are infrasonic sounds?
Infrasonic sounds are sounds that have frequencies less than 20 Hz and are completely inaudible to the human ear.
How do dishwashers use ultrasonic waves to clean utensils?
Dishwashers use ultrasonic vibrators to rapidly vibrate the water and detergent, which effectively removes grease and dirt from the utensils.
What happens to ultrasound waves when they encounter a defect in a metal block during testing?
When ultrasound waves encounter a defect in a metal block, they are reflected back and do not reach the ultrasound detector on the opposite side.
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.