Tag: sound

Questions Related to sound

The waves that transfer vibrations and disturbance are

physics sound sound is produced by a vibrating body propagation of sound production and propagation of sound

  1. Sound waves

  2. Light waves

  3. Infrared waves

  4. Ultrasonic waves

Show answer
Correct Option: A
Explanation:

Sound is a form of energy produced and transmitted by vibrating matter. Sound travels in waves. When sound moves through matter (solid, liquid, or a gas), the molecules of the matter move backward and forward in the direction in which the wave is travelling. This movement is called a vibration. Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together. Sound travels the lowest through gases because the molecules of a gas are farthest apart. In a vacuum sound cannot travel because there is no matter for it to move through.
Hence, the sound waves transfer vibrations or disturbance to produce sound.

A to and fro motion by an object is also called 

physics sound sound is produced by a vibrating body propagation of sound production and propagation of sound

  1. periodic motion

  2. oscillatory motion

  3. cyclic motion

  4. none of these

Show answer
Correct Option: B
Explanation:

    Periodic motion is defined as the motion which is repeated identically after a fixed interval of time , to and fro motion is not necessary here .

    Oscillatory motion is that motion in which body moves to and fro about a fixed point in a fixed interval of time .
    In a cyclic motion , body returns at its initial position after a time .

Sound is produced in a bamboo flute because:

physics sound sound is produced by a vibrating body propagation of sound production and propagation of sound

  1. air starts vibrating

  2. bamboo starts vibrating

  3. air hits the bamboo

  4. direction of air is changed

Show answer
Correct Option: A
Explanation:

   When we put air in a bamboo flute by our mouth , we give energy to the air inside the flute and air inside the bamboo flute starts vibrating and we get a sweet sound .

The sounds having frequency less than 20 Hz are called ultrasonics.

physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Human beings can normally hear sounds with a frequency between about 20 Hz and 20,000 Hz. Sounds with frequencies below 20 hertz are called infrasound. Infrasound is too low-pitched for humans to hear.

so the answer is B.

Human ears can sense sound wave travelling in air having wavelength of ................... .

physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

  1. $10^{-3}$ m

  2. $10^{-2}$ m

  3. 1 m

  4. $10^{2}$ m

Show answer
Correct Option: C
Explanation:

The audible wave length range of human beings in (16.5 mm - 16.5 m)
Hence 1 m is the correct option.

The frequencies below 20 Hz are known as infrasonic sounds.

physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

yes , below 20hz frequency sound is infrasonic.

so the answer is A.

What is the approximate range of audible sound frequencies for a human with good hearing?

physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

  1. From $20Hz$ to $2000Hz$

  2. From $20Hz$ to $20000Hz$

  3. From $200Hz$ to $20000Hz$

  4. From $200Hz$ to $200000Hz$

Show answer
Correct Option: B
Explanation:

Adult humans can hear from 20Hz to 20000Hz of frequency.

Which of the following frequencies of sound elephants produce ?

physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

  1. ultrasonic

  2. infrasonic

  3. both A & B

  4. cant say

Show answer
Correct Option: B
Explanation:

Some of the elephant's vocalizations are infrasonic, and thus are inaudible to humans. The prominence of very low frequencies in the vocalizations is a defining characteristic of all three species of elephants. Sounds are generally considered to be infrasonic if their frequency is less than $20 Hz$ (the lower limit of human hearing). Low frequency sounds travel farther than high frequency ones, which make them ideal for long distance communication.
Hence, Elephants produce infrasonic sound. 

Name the sounds of the frequencies given below $10Hz$.

physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

  1. $ultrasonic$

  2. $infrasonic$

  3. $supersonic$

  4. None of the above

Show answer
Correct Option: B
Explanation:

Infra-sound is a low-frequency sound. It is sound that is lower in frequency than $20 \ Hz$ or cycles per second, the normal limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. The ear is the primary organ for sensing infra-sound, but at higher intensities it is possible to feel infra-sound vibrations in various parts of the body.

Infrasound can be heard by

physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

  1. dog

  2. bat

  3. rhinoceros

  4. human beings

Show answer
Correct Option: C
Explanation:

Rhinos have extremely good ears, picking up infra-sound far deeper than the range of human hearing.
Rhinos, can hear down to a frequency of four hertz, whereas even a human baby, with entirely undamaged ears, can normally only pick up sounds as low as 20 hertz. Giraffes and elephants can also hear in this infra-sound range.