Tag: applications of ultrasound

Questions Related to applications of ultrasound

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

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

  1. sound becomes blurred

  2. sound become distorted

  3. sound remains same 

  4. both A and B

Show answer
Correct Option: D
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.

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

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

  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

Show answer
Correct Option: A
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.

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

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

  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.

Show answer
Correct Option: C
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.

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

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

  1. undesirable

  2. desirable

  3. zero

  4. none of the above

Show answer
Correct Option: A
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.

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

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

  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

Show answer
Correct Option: C
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.

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

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

  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

Show answer
Correct Option: B
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.

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

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

  1. sound is absorbed by the curtains

  2. less reverberation without curtains

  3. high reverberation without curtains

  4. both A and B

Show answer
Correct Option: B
Explanation:

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

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. 

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

  1. i, ii

  2. ii, iii

  3. i, iii

  4. All of them

Show answer
Correct Option: D
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

Mark the correct match

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

  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

Show answer
Correct Option: D
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.

Identify the device which work on the reflection of sound.

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

  1. Megaphone

  2. Stethoscope

  3. Sound boards

  4. All of the above

Show answer
Correct Option: D
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.