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Multiple choice physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

Sound is a form of energy. True or false.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sound is the movement of energy through substances in longitudinal (compression or rarefaction) waves. Sound is produced when a force causes an object or substance to vibrate. That is, the energy is transferred through the substance in a wave. So, sound is a form of energy.

Multiple choice physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

Characteristic of sound which enables us to distinguish between two sound of same loudness and pitch :

  1. quality

  2. timbre

  3. amplitude

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

 Quality is that characteristic of sound which enables us to distinguish between two sounds from two sources , even of the same frequency (pitch) and loudness . Quality is also called timbre . So option a and b are correct .

Multiple choice physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

Sound wave can be described graphically by

  1. velocity displacement graph

  2. displacement time graph

  3. density distance graph

  4. amplitude velocity graph
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A longitudinal wave, eg., Sound wave can be described by a density-distance graph. In density time graph, particle density of the medium is plotted on y axis where as time on the x axis

Multiple choice physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

In density time graph

  1. particle density of the medium is plotted on y axis where as time on the x axis

  2. time on the y axis, particle density on x axis

  3. both a and b can be done interchangeably

  4. can't be plotted

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The density time graph for a longitudinal wave is drawn by plotting the particle density on the medium at any point on the wave on the y axis against time on the x axis.

Multiple choice physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

In wave motion particles of the medium

  1. move from one place to another

  2. do not move from one place to another

  3. vibrate about their mean positions

  4. vibrate away from their mean position
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a wave passes through a medium, the particles of the medium vibrate according to the wave about the mean positions.

Multiple choice physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

During a wave motion 

  1. no transfer of matter occurrs through the medium

  2. energy is transferred from one part of the medium to another

  3. both a and b occurs

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

During a wave motion only energy is transferred no transfer of matter occurs through the medium. Only vibrations travels not the air.

Multiple choice physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

Mark the correct statement

  1. Hard surfaces are good reflectors of sound

  2. Soft surfaces are poor reflectors of sound

  3. Bad reflectors of sound are good absorbers of sound

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

Sound is not reflected equally from different materials. Hard surfaces reflect more sound. Hard surfaces are good reflectors of sound. 
Soft or porous surfaces are poor reflectors of sound. Bad reflectors of sound are good absorbers of sound. These sound absorbing materials are used to cover walls, ceilings etc.