Science Question Answer (1 Marks)

The pitch of a sound depends on the frequency of the sound.

The air particles vibrate in the air column in the flute, which produces sound.

20Hz is the lower limit of frequency of human hearing.

The vibration of our eardrums brings us the sound of a ringing telephone bell.

The vocal chords of the human voice box vibrate to produce sound.

Dogs and cats.

The speed of sound is faster in solid as compared to gas. Thus, the speed of sound is more in iron.

The working of a toy telephone tells us that vibrating objects produce sound and it is carried in all directions in a medium.

The male vocal chords are between 17mm and 25mm in length.

Bats can produce ultrasonic sounds.

Frequency is the term used for number of vibrations made per second.

Option (a) is correct. 50,000Hz can be heard by dog but not human being.

The frequency is described as the number of vibrations or oscillations per second. Its unit is Hertz (Hz).

The Normal conversation is at 60 dB.

A sound making object vibrates while a silent does not. You can feel the vibrations by touching them.

Noise pollution is caused by the working of mixer and grinder in the kitchen.

Loud noise and noise pollution are the usual causes of the partial hearing loss suffered by a person.

Ultrasonic waves is the name of very high frequency sounds which cannot be heard by the human ear.

Vocal chords vibrates when we speak.

The pitch of the sound enables us to distinguish between a man's voice and a woman's voice even without seeing them.

Loudness is directly related to amplitude. If amplitude is high, then loudness is high. But if amplitude is low, then the loudness is low.

20,000Hz is the upper limit of frequency of human hearing.

The tone of the sound will distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).

The loudness of a sound depends Amplitude.

No, we must never put a pen or pencil in our ears, because it can tear our ear diaphragm.

Our ears are the organs of hearing in our body.

Vacuum cannot transmit sound because sound needs a material medium to travel.

The speed of sound is faster in solid as compared to liquid. Thus, the speed of sound is more in steel.

Amplitude is called as the maximum displacement of a vibrating body from its central position.

Vocal chords are the sound producing organ in humans.

Decibel is the unit used to measure the loudness of sound. Its symbol is dB.

The auditory nerve carries electrical impulses from the cochlea of ear to the brain.

We can feel the vibration of table membrane when we hit it to produce sound.

Frequency, amplitude and Phase are the three characteristics which are used to describe oscillations (or vibrations).

The unit of frequency is called “hertz”.

Eardrum vibrates when outside sound falls on it.

An object should vibrate in order to be table to produce sound.

We cannot hear the screams of a bat because its frequency is higher than 20,000Hz.

The vocal chords are stretched across the larynx and they vibrate to produce sound.

Sound is produced by vibrating objects.

The speed of sound is faster in solid as compared to liquid. Thus, the speed of sound is more in wood.

Decibels is the full form of dB.

Drum produces higher pitch.

The speed of sound in air is 343m/s.

The three bones help in transmitting the sound into the middle ear.

The speed of sound is faster in solid as compared to liquid, and then slowest in gases. Thus, the speed of sound is more in steel, then water and then air.

It is more convenient to put the ear to the track, If you want to hear a train approaching from far away because we can hear the vibrations from the ground when we put our ear at the track.