Tag: physics

Questions Related to physics

The difference between a muscial sound and noise is:

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

  1. amplitude

  2. loudness

  3. vibration

  4. all of the above

Show answer
Correct Option: C
Explanation:

Musical sound is produced by regular vibration where as noise is produced by irregular vibration.

The buzzing sound produced by a mosquito is produced by:

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

  1. its mouth

  2. vibration of sorrunding air

  3. vibration of wings

  4. none of these

Show answer
Correct Option: C
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.

Noise pollution can cause:

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

  1. insmonia

  2. hypertension

  3. hearing impairment

  4. all of the above

Show answer
Correct Option: D
Explanation:

Noise pollution is hazardous to health in many ways as it can cause insomnia, hypertension and hearing impairment.

Thermocol is a:

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

  1. good reflector of sound

  2. good absorber of sound

  3. bad absorber of sound

  4. good conductor of sound

Show answer
Correct Option: B
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 .

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

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

  1. pitch

  2. musicalsound

  3. noise

  4. all of the above

Show answer
Correct Option: C
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 . 

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)

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

  1. $TFTTFFT$

  2. $TTFTFFT$

  3. $TFFTFFF$

  4. $TFFTFFT$

Show answer
Correct Option: D
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.

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

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

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

Show answer
Correct Option: B
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.

Select the odd one out (loudspeakers, aeroplanes, vacuum cleaners, ear plugs)

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

  1. Ear plugs

  2. Aeroplanes

  3. Vacuum cleaners

  4. Loudspeakers

Show answer
Correct Option: A
Explanation:

Ear plugs prevent sound pollution others are sources of noise pollution

Select the odd one out (soft horns, ear plugs, silencers, loudspeakers)

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

  1. soft horns

  2. ear plugs

  3. silencers

  4. loudspeakers

Show answer
Correct Option: D
Explanation:

Except loud speaker all are preventive measures of noise pollution while loud speaker creates noise pollution

Unpleasant sound : Noise : : Pleasant sound :______. Fill in the blank. 

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

  1. Audible sound

  2. Infrasound

  3. Music

  4. Ultrasound

Show answer
Correct Option: C
Explanation:

Sounds that are unpleasing and disturbing to the ears are called noise, whereas, the pleasing and comforting to the ears are called music, like those produced by musical instruments.