Tag: sound and noise

Quizzes (1) Questions (42)

Questions Related to sound and noise

Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

While travelling by train, when the train passes through the tunnel, why does our ear aches ?

  1. atmospheric pressure

  2. tunnel pressure

  3. water pressure

  4. None of the above

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

When a train enters a tunnel, it compresses the air in front of it like a piston. Unlike outside air, air in a tunnel can’t be simply pushed aside—the tunnel walls are in the way. Some of the air is pushed forward, all the way down to the tunnel’s other end, but most of it rushes through the narrow space between the train and the tunnel walls, filling in the area behind the train. Being forced into this narrow space makes the air rush faster, exactly as water speeds up at the base of a funnel. In fact, this tunnel air can rush backward much faster than the train’s forward speed. his fast moving air creates a kind of suction on the train, lowering the air pressure inside and making your ears go pop. It cause ear aches

Hence, due to sudden increase and decrease pressure inside tunnel, aches occur in ear 

Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

The buzzing sound produced by a mosquito is produced by:

  1. its mouth

  2. vibration of sorrunding air

  3. vibration of wings

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

$Answer:-$ C

The noise from a mosquito comes from its wing beat. since the sound is of low intensity, attrition is quick to set in over even short distances and we would hear it only if its close to our ears. it is the high pitch of the sound that probably makes it so irritating.

Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

Thermocol is a:

  1. good reflector of sound

  2. good absorber of sound

  3. bad absorber of sound

  4. good conductor of sound
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Materials which are soft , porous and have a high sound absorption coefficient , are good absorber of sound , thermocol has these qualities , so it is a good absorber of sound .

Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

The amplitude of vibration and its frequency can change suddenly in a:

  1. pitch

  2. musicalsound

  3. noise

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

Pitch is a characteristic of sound , which depends upon frequency and amplitude of vibration doesn't affect it .

A musical sound has , regular and discrete frequencies , sudden change in amplitude and frequency will make it unpleasant , so it doesn't happen in musical sound .
Noise is a mixture of irregular and continuous frequencies , which has sudden change in amplitude and frequency . 

Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

In the following sentence. say 'True' and 'False'
$(a)$ Sound can't travel in vacuum (T/F)
$(b)$ The number of oscillations per second of a vibrating object is called its time period. (T/F)
$(c)$ If the amplitude of vibration is large, sound is feeble. (T/F)
$(d)$ For human ears, the audible range is 20Hz to 20,000Hz. (T/F)
$(e)$ The lower the frequency of vibration, the higher is the pitch.
$(f)$ Unwanted or unpleasant sound is termed as music. (T/F)
$(g)$ Noise pollution may cause partial hearing impairment. (T/F)

  1. $TFTTFFT$
  2. $TTFTFFT$
  3. $TFFTFFF$
  4. $TFFTFFT$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Below are the answers and the corresponding explanations.

(a) True. Sound requires a medium to travel through. Since vacuum is devoid of any medium, sound cannot travel through it.

(b) False. The number of oscillations per second of a vibrating object is known as its frequency. Time period is the time
required to complete one oscillation.

(c) False. Loudness of a sound is proportional to the square of the amplitude of its vibration. When the amplitude of
vibration of a sound is large, the sound is very loud. The sound is feeble for small amplitude.

(d) True. Humans cannot hear sounds of all frequencies. Human can hear a sound whose frequency falls in the range of
20 Hz - 20,000 Hz. The sound having frequency out of this range is inaudible to humans.

(e) False. The pitch of a sound is proportional to its frequency. As the frequency of vibration increases,
the pitch of the sound also increases and vice versa. A sound is said to be high pitched if its frequency of vibration is high
and is low pitched for a small frequency of vibration.

(f) False. Unwanted or unpleasant sounds are known as noise. Sounds that are melodious and pleasing to ear are known as music.

(g) True. Unwanted or unpleasant sounds are known as noise. If one is subjected to loud unpleasant sound
continuously for a long time, then it may cause temporary hearing impairment.

Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

Trees must be removed from the road sides and around buildings to reduce the harmful effects of noise pollution.

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Trees absorb and block noise and reduce glare. A well placed tree can reduce noise by as much as 40 percent.
Hence, the statement is False.