CBSE Questions for Class 8 Physics Sound Quiz 4 - MCQExams.com

Presence of excessive unwanted sounds in the environment is called 
  • air pollution
  • noise pollution
  • water pollution
  • all of these
Which of the following is not caused due to noise pollution?
  • Lack of sleep
  • Hypertension
  • Diabetes
  • Anxiety
How many vocal cords does a person have?
  • $$3$$
  • $$1$$
  • $$2$$
  • $$5$$
To reduce noise pollution, which of the following devices must be installed on the vehicles ?
  • Lights
  • Speedometer
  • Horn
  • Silencer
The waveform of noise sound is 
  • Irregular
  • Sudden
  • Periodic
  • Both A and B
___________ is the main cause of noise pollution in cities.
  • Traffic
  • Factories
  • Music
  • Radio
The characteristics of musical sound are
  • Intensity
  • Frequency
  • Quality
  • All
Noise pollution is caused by
  • sound above $$65 \ dB$$ loudness
  • sound below $$65 \ dB$$ loudness
  • any sound
  • sound above $$20000 \ Hz$$ frequency
Highest loudness of sound causing no harm to the ear is
  • 20 dB
  • 25 dB
  • 75 dB
  • 10 dB
Sound is produced by vibration. Define vibration.
  • Vibration is a rapid to and fro motion of the object.
  • Vibration is a circular motion of the object.
  • Vibration is a translational motion of the object.
  • None of the above
Which body part is useful in producing sound of the voice in humans?
  • Vocal folds in larynx
  • Lungs
  • Wind pipe
  • Throat
State whether given statement is True or False :
Sound from outer space adds to the noise pollution on the earth.
  • True
  • False
What does music comprise of?
  • Mixture of frequencies, regular waveform and no sudden changes in amplitude or wavelength, rich quality/ timber
  • Low Frequency, regular waveform and no sudden changes in amplitude or wavelength, poor quality/ timber
  • High Frequency, Irregular waveform and no sudden changes in amplitude or wavelength
  • Low Frequency, Irregular waveform and sudden changes in amplitude or wavelength
The unwanted sound, usually very loud and non-uniform, is called:
  • music
  • noise
  • a combination of music and noise
  • none of these
When sound travels through air, the air particles:
  • vibrate along direction of wave propagation
  • vibrate but not in any fixed direction
  • vibrate perpendicular to direction of wave propagation
  • do not vibrate
What is the average adult female speaking voice range?
  • $$125Hz$$
  • $$210Hz$$
  • $$300Hz$$
  • $$400Hz$$
What is known as strength of ear's perception of sound?
  • Loudness
  • Intensity
  • Frequency
  • Amplitude
Which of the following waves do not require any kind of medium to propagate?
  • Sound Waves
  • Earthquake Waves
  • Light Waves
  • Water surface waves
If a musical instrument is played on very high pitch then its frequency is:
  • same
  • high
  • low
  • zero
The art of arranging and combining sounds in order to create harmonious melody is:
  • Noise
  • Music
  • A combination of noise and music
  • None of these
What is the process, of converting the air pressure from the lungs into audible vibrations, called?
  • Excitation
  • Vibration
  • Phonation
  • None
The response of human ear to sound in terms of its shrillness is known as:
  • frequency
  • pitch
  • loudness
  • amplitude
Which of the following causes noise pollution?
  • Loud Speakers
  • Radio at low volume
  • Low music
  • None of these
Amplitude of wave is:
  • the distance wave moves in one second
  • distance wave moves in one time period of wave
  • maximum distance moved by medium particles on either side of mean position
  • distance equal to 1 wavelength
State whether given statement is True or False
Both Noise and Music when very loud can be damaging to human ears.
  • True
  • False

If pitch of a sound is pleasing to our ears, the sound is:
  • Music
  • Noise
  • A combination of music and noise
  • None of these
Loudness of sound is measured in:
  • $$angstorm$$
  • $$erg$$
  • $$newton$$
  • $$decibel\ (dB)$$

Fill in the blanks:

1) Perceived fundamental frequency of sound is  -------------.

2) Quality of sound is  -------------.
  • 1. Tone
    2. Pitch
  • 1. Pitch
    2. Tone
  • 1. Pitch
    2. Loudness
  • 1. Loudness
    2. Tone
Which of the following is / are effective for preventing noise pollution?
  • Construction of sound proof rooms for noisy machinery in industries
  • Ban on use of horns with jarring sound
  • Vegetation along roads in residential areas
  • All of the Above
What health problems can be caused due to noise pollution?
  • High Blood Pressure, Anxiety, Stress
  • Only Anxiety
  • Only Stress
  • None
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