Tag: applications of ultrasound

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Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Excessive reverberation in any auditorium/hall is not desirable because :

  1. sound becomes blurred

  2. sound become distorted

  3. sound remains same

  4. both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Excessive reverberation in any auditorium or hall is not desirable because the sound becomes blurred and distorted. So the reverberation needs to be reduced.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Megaphones or loudhailers, horns, musical instruments such as trumpets and  shehnais, are all designed to ______.

  1. send sound in a particular direction without spreading it in all directions.

  2. send sound in a particular direction spreading it in all directions.

  3. collect sound from all directions spreading it in all directions.

  4. all of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Megaphones or loudhailers, horns, musical instruments such as trumpets and shehnais, are all designed to send sound in a particular direction without spreading it in all direction.
In these instruments, a tube followed by a conical opening reflects sound successively to guide most of the sound waves from the source in the forward direction towards the audience.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Why the ceiling of concert halls, cinema halls made curved?

  1. To make the hall beautiful

  2. For proper light conditions

  3. So that the sound can reach all corners properly

  4. So that the picture or the stage can be visible to each and every person.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In concert halls, cinema halls, conference halls, the ceiling are made curved, so that the sound after reflection from the curved surface reaches all corners of the hall evenly.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

In an auditorium or big hall excessive reverberation is highly _______.

  1. undesirable

  2. desirable

  3. zero

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sound created in a big hall will persist  by repeated reflection from the walls until it is reduced to a value where it is no longer audible. The repeated reflection that results in this persistence of sound is called reverberation. In an auditorium or big hall excessive reverberation is highly undesirable.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

If the ceiling of a cinema is made flat, what will happen?

  1. No sound will be audible at all

  2. Picture will vanish

  3. Sound will not reach properly to every person

  4. Pictures will not be clear to everyone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ceiling in a cinema hall is made curve so that the sound of music, dialogue etc must reach evenly to all the audience. So that the sound after reflection from the curved surface reaches all corners of the hall evenly.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Reverberation time of a hall used for speeches should be very short. Otherwise

  1. multiple echos will enhance the sound quality

  2. multiple echos will interfere with the original sound

  3. multiple echos will not interfere with the original sound

  4. both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reverberation time of a hall used for speeches should be very short because multiple echoes will interfere with the original sound. So, reverberation time is reduced to avoid multiple echoes.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Why do we hear more clearly in a room with curtains than in a room without curtains? 

  1. sound is absorbed by the curtains

  2. less reverberation without curtains

  3. high reverberation without curtains

  4. both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There is more reverberation in rooms with curtains so we can hear sound more clearly.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Mark the correct statement :

i)rock music also becomes less pleasing with excessive reverberation.
ii)excessive reverberation is desirable in case of orchestral and choral music. 
iii)excessive reverberation makes the speech of a person indistinct. 

  1. i, ii

  2. ii, iii

  3. i, iii

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

A certain amount of reverberation may improve the quality of sound. However, excessive reverberation is sometimes undesirable as it interferes with the original sound and hence makes the speech or music indinstict

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Mark the correct match

  1. Good reflectors of sound-Tiles, Marble slabs

  2. Bad reflectors of sound - Thick curtains, thick carpets

  3. Good absorbers of sound - Holed cardboard

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

Sound is not reflected equally from different materials. Hard surfaces reflects more sound.
Bad reflectors of sound are good absorbers. Soft thick curtains, thick carpets, holed card boards are examples of good absorbers of sound.

Multiple choice physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

Identify the device which work on the reflection of sound.

  1. Megaphone

  2. Stethoscope

  3. Sound boards

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

Megaphone, Stethoscope and Sound boards work on the reflection of sound.

$1.$Megaphone is a portable, cone shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction.
$2.$Stethoscope is an acoustic medical device for listening to the internal sounds of an animal or human body.
$3.$Sound board is the surface of a string instrument that the string vibrate against.