Science questions in short. [3 marks ]

The sound which produces a pleasing sensation on hearing is called music. For example, the sounds produced by musical instruments like flute, sitar, etc. On the other hand, the sound which produces unpleasing sensation on hearing is called noise. For example, the sound produced by horns of vehicles, machines, etc.
Yes, music can become noise sometimes like if the music is played at very high volume or different types of music are played at the same time.

Dholak is a musical instrument: It consists of a stretched membrane called its head. When the head is beaten gently, the stretched membrane sets into vibration. Since sound is produced when an object vibrates, the dholak produces a sound.
Sitar is a musical instrument: It consists of stretched strings. When a string is plucked, it sets into vibration. Since sound is produced when an object vibrates, the sitar produces a sound.
Flute is a hollow pipe: When air is blown over its mouth, the air inside the pipe is set into vibration. As a result, a pleasant sound is produced.

A sketch of larynx is shown below:
Larynx is that part of throat which is responsible for producing sound. Inside larynx, there are two vocal cords, which are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for the passage of air. When we speak, air is forced into this small gap by the lungs which prompt vocal cords to vibrate. When the lungs force air through the slit, the vocal cords vibrate, producing sound.

There will be more noise in the house which is along the roadside due to noise produced by transportation vehicles. But, the house which is three lanes away from the roadside would have comparatively less noise . Therefore, it is better to take the house that is three lanes away from the roadside.

When we prick a stretched rubber band, we can see the to and fro motion of the rubber band. This motion of the rubber band is known as vibration. When the rubber band is vibrating, the number of small oscillating loops that the rubber band makes is defined as the frequency of the rubber band. The more the oscillating loops more is the frequency of the rubber band and vice versa.

I would suggest my parents to buy a house three lanes away from the roadside because there would be more noise along the roadside produced by the vehicles. And the amount of noise will decrease as one move away from the roadside.

We know that speed, pitch, loudness all are initiated with a vibration. During the day, there is a number of vibrations around us. so, the sound coming from the clock gets disturbed and amplitude of vibrations becomes small. But during the night there are not such multiple vibrations in the enviornment. so,sound is more clear. Further,-''the dew factor at night increases the speed of sound as moisture level increases.

The astronauts have sound transmitting devices in the helmets they wear which help them exchange sound waves with one-another. This is because moon does not have any atmosphere and sound its does not have any medium for sound to travel as sound does not travel in vacuum.

As seen from the figure given below, the sound is carried through the Ear canal.

Toy telephone works due to sounds produced by vibration of stretched wire. Toy telephone is a basic telephone made out of a long string and two paper or plastic cups. When a person speaks at one of the cups then the vibrations of sound produced by the stretched wire enables the other person to hear his voice successfully. Hence, we can conclude that sound produced by stretched wire is due to vibration.

The three tiny bones – the malleus, incus, and stapes – are found in the middle ear. Each bone is named in Latin for its shape.

Dholak.	Diaphragm (stretched membrane).
Sitar.	Strings of the Sitar.
Flute.	Air column inside the flute.