Tag: physics

Questions Related to physics

Which of the following parameters determines the loudness of sound ?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. Frequency

  2. Amplitude

  3. Wavelength

  4. Speed

Show answer
Correct Option: B
Explanation:

When we change amplitude of vibration , volume of the sound also changes and due to volume of sound loudness will also change .

The _________ of sound depends on amplitude of vibration of the source.

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. loudness

  2. pitch

  3. timbre

  4. frequency

Show answer
Correct Option: A
Explanation:

The loudness of sound depends on amplitude of vibration of the source. Loudness of sound is directly proportional to the square of the amplitude of vibration producing the sound.

The more the amplitude of a vibrating body the more is the loudness. True or false.

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The amplitude of a sound wave determines its loudness. Sound wave with a large amount of energy have a larger amplitude which increases the loudness in the wave. A large amplitude means a louder sound and a smaller amplitude means a softer sound.

Louder the sound less is the amplitude of vibrating body. State whether true or false.

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Louder the sound more is the amplitude of vibrating body

Mark the incorrect statements.
(a) intensity of sound depends on the response of our ears
(b) loudness can be measured as a physical quantity
(c) loudness is a subjective quantity.

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. a, b

  2. a, c

  3. b, c

  4. all of them

Show answer
Correct Option: A
Explanation:

Intensity of sound is an objective quantity. It does not depend on the response of our ears. 
Loudness is a subjective quantity. It cannot be measured as a physical quantity.

A device based on multiple reflection used for sending amplified sound in a particular direction

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. Bulb horn

  2. Megaphone

  3. Ear trumpet

  4. All

Show answer
Correct Option: B
Explanation:

Megaphone is based on multiple reflection of sound. It is a horn shaped tube designed to send amplified sound in a particular direction. It is also called Loud hailer.

Mark the incorrect statement :

 a)intensity of sound depends on the response of our ears 

b)loudness can be measured as a physical quantity 

c)loudness is a subjective quantity. 

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. a,b

  2. a,c

  3. b,c

  4. all

Show answer
Correct Option: A
Explanation:

Intensity of sound is an objective quantity. It does not depend on the response of our ears. Loudness is a subjective quantity. It cannot be measured as a physical quantity.

How does Sound produced by humans?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. In humans sound is produced by the voice box

  2. In humans sound is produced by the larynx

  3. In humans sound is produced by the upper part of the wind pipe.

  4. all

Show answer
Correct Option: D
Explanation:

In humans sound is produced by the vioce box or larynx. It is the upper part of the wind pipe. Two vocal cords are stretched across the voice box leaving a narrow slit. When the lungs force air through the slit, it vibrates and produces sound.

The greater the surface area of the vibrating body, the________is the loudness of sound.

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. Lesser

  2. Greater

  3. Remains same

  4. None of these

Show answer
Correct Option: A
Explanation:

Loudness of the sound  $L = 10 \log _{10} \dfrac{I}{I _o}$

where $I$ is the intensity of sound.
Greater the surface area of the vibrating body, lesser will be the amplitude of the sound and thus lesser will be the intensity of the sound.

Thus lesser will be the loudness of sound.

When we increase the loudness of sound of a TV, the property of sound that changes is:

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. Amplitude

  2. Frequency

  3. Wavelength

  4. Speed

Show answer
Correct Option: A
Explanation:

Loudness of sound is proportional to the intensity and amplitude of sound. So when we turn on the volume of tv, the amplitude of sound wave increases hence, loudness of sound increases 

So the answer is A.