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Class 8 Practice – Level 3 – Set 2 – Sound
Total questions: 15
1.
What happens to the amplitude of a sound wave during destructive interference?
It increases significantly
It decreases
It remains the same
It fluctuates
None
2.
If sound travels at 343 m/s in air, how far can it travel in 3 seconds?
1029 m
849 m
1200 m
345 m
None
3.
Why are auditoriums designed with sloped floors and curved ceilings?
To prevent sound distortion
To absorb sound waves
To enhance sound reflection and distribution
To create echoes
None
4.
What type of energy conversion occurs when sound waves hit a surface and cause it to vibrate?
Kinetic energy to potential energy
Sound energy to thermal energy
Sound energy to mechanical energy
Sound energy to chemical energy
None
5.
What determines the loudness of a sound wave?
Frequency
Amplitude
Wavelength
Speed
None
6.
What industrial application utilizes ultrasonic waves for cleaning?
Sandblasting
Ultrasonic cleaning
Laser cutting
Welding
None
7.
Which of the following best describes the relationship between harmonics and the fundamental frequency?
Harmonics are always lower frequencies than the fundamental
Harmonics are multiples of the fundamental frequency
Harmonics can only exist in closed tubes
Harmonics are multiples of the fundamental frequency
None
8.
How does sound travel in a vacuum?
Sound cannot travel in a vacuum
Sound travels as electromagnetic waves
Sound travels slower in a vacuum
Sound travels faster in a vacuum
None
9.
Which of the following frequencies is most likely to cause hearing damage with prolonged exposure?
30 Hz
100 Hz
85 dB
1,000 Hz
None
10.
What is acoustic impedance?
The speed of sound in a medium
The speed of sound in a medium
The frequency of sound waves
The intensity of sound waves
None
11.
What occurs when sound waves encounter a barrier with a small opening?
Reflection
Absorption
Refraction
Diffraction
None
12.
What determines the fundamental frequency of a vibrating string?
The mass and length of the string
The temperature of the string
The tension of the string only
The shape of the string
None
13.
How do animals such as bats use sound for navigation?
By emitting sound waves and listening for echoes
By using visual signals
By detecting electromagnetic waves
By sensing vibrations through the ground
None
14.
When sound travels from air into water, what change occurs?
Speed decreases and frequency increases
Speed increases and frequency decreases
Speed increases and frequency remains the same
Speed remains constant and frequency increases
None
15.
Which of the following best describes a sound wave with a high frequency?
It has a short wavelength and high pitch
It has a long wavelength and low pitch
It has low amplitude and low pitch
It has variable loudness
None
1 out of 15
Time's up
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