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Class 8 Practice – Level 3 – Set 1 – Sound
Total questions: 15
1.
What is the phenomenon called when the frequency of sound changes due to the relative motion between the source and the observer?
Reflection
Refraction
Doppler Effect
Interference
None
2.
Which of the following statements is true about harmonics in musical instruments?
The fundamental frequency is the first harmonic
Harmonics are always audible
Overtones are the same as fundamental frequencies
The first overtone is the highest frequency produced
None
3.
What type of interference occurs when two sound waves combine to produce a louder sound?
Destructive interference
Superposition
Destructive interference
Diffraction
None
4.
How does the human ear distinguish between different pitches of sound?
By the place of maximum vibration along the basilar membrane
By the intensity of sound
By the speed of sound waves
By the loudness of the sound
None
5.
What acoustic phenomenon is primarily responsible for the sound distortion experienced in large, empty spaces?
Reverberation
Reflection
Diffraction
Resonance
None
6.
How does temperature affect the speed of sound in air?
Speed increases with decreasing temperature
Speed is unaffected by temperature
Speed decreases with increasing temperature
Speed increases with increasing temperature
None
7.
What is one significant application of ultrasonic waves in technology?
Sound recording
Sonar navigation
Musical instruments
Television broadcasting
None
8.
What is a common psychological effect of long-term exposure to noise pollution?
Improved mood
Enhanced cognitive function
Increased stress and anxiety
Better sleep quality
None
9.
What is the effect of sound waves traveling through different mediums on their frequency?
Frequency increases
Frequency remains unchanged
Frequency decreases
Frequency becomes variable
None
10.
What is resonance in the context of sound waves?
The absorption of sound waves
The cancellation of sound waves
The distortion of sound waves
The reinforcement of sound waves at specific frequencies
None
11.
Which of the following is a health risk associated with prolonged exposure to sounds above 85 decibels?
Improved hearing
Tinnitus
Better sleep
Enhanced focus
None
12.
What property of sound waves affects their ability to diffract around obstacles?
Frequency
Intensity
Amplitude
Wavelength
None
13.
How does a string instrument produce different musical notes?
By changing the density of the strings
By altering the length and tension of the strings
By adjusting the temperature of the strings
None
14.
What is the typical human hearing range in terms of frequency?
20 Hz to 20,000 Hz
10 Hz to 15,000 Hz
50 Hz to 30,000 Hz
5 Hz to 50,000 Hz
None
15.
Which of the following uses sound waves to detect objects underwater?
Barometer
Sonar
Seismograph
Thermometer
None
1 out of 15
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