Tag: physics

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

Which of the following will produce sound through vibration.

  1. A plastic scale when bent over the edge of a bench

  2. Saying 'Ah' for few seconds

  3. Plucking a rubber string by fingers

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All vibration produces sound. In some cases vibrations are visible to our naked eyes but Observe that sound is produced by vibration in some cases they can only be felt not seen. In all the above activities sound can be produced.

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

The waves that transfer vibrations and disturbance are

  1. Sound waves

  2. Light waves

  3. Infrared waves

  4. Ultrasonic waves
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

A to and fro motion by an object is also called 

  1. periodic motion

  2. oscillatory motion

  3. cyclic motion

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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 .

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

Sound is produced in a bamboo flute because:

  1. air starts vibrating

  2. bamboo starts vibrating

  3. air hits the bamboo

  4. direction of air is changed
Reveal answer Fill a bubble to check yourself
A Correct answer
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 .

Multiple choice physics world of sounds sound is produced by a vibrating body propagation of sound production and propagation of sound

The membrane of a drum vibrates to produce sound. Similarly the string of a sitarvibrates to produce sound. Based on these two examples answer the following question. Which part of a whistle vibrates to produce sound?

  1. body of whistle

  2. air

  3. mouth of the person

  4. all ofthe above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The vibrations produced in the air while blowing a whistle, produces sound.

Multiple choice physics world of sounds sound is produced by a vibrating body propagation of sound production and propagation of sound

What do you think a tabla player does to increase the pitch of the sound produced?

  1. He strikes the table skin harder.

  2. The pitch cannot be changed in a table.

  3. He tightens the skin by stretching the string around it.

  4. He gets a bigger tabla.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is C.

The top of the tabla drum is covered with a stretched, layered leather membrane held in place by leather braces. The wooden pegs between the braces and the drum adjust the tension in the braces, thus controlling the pitch of the instrument.
Hence, to increase the pitch of the sound produced the player tightens the skin by stretching the string around it.