Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

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

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

  1. loudness

  2. pitch

  3. timbre

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

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

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

  1. True

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

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

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.

  1. a, b

  2. a, c

  3. b, c

  4. all of them
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Bulb horn

  2. Megaphone

  3. Ear trumpet

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

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

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. 

  1. a,b

  2. a,c

  3. b,c

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

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

How does Sound produced by humans?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. Lesser

  2. Greater

  3. Remains same

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Amplitude

  2. Frequency

  3. Wavelength

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