Q. A sound wave has a frequency of 440 Hz. What is its period?
-
A.
0.00227 s
-
B.
0.00455 s
-
C.
0.01 s
-
D.
0.1 s
Solution
The period (T) is the inverse of frequency (f), T = 1/f = 1/440 ≈ 0.00227 s.
Correct Answer:
B
— 0.00455 s
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Q. If a sound source moves towards a stationary observer, what happens to the frequency heard by the observer?
-
A.
Increases
-
B.
Decreases
-
C.
Remains the same
-
D.
Becomes zero
Solution
As the sound source approaches, the frequency increases due to the Doppler effect.
Correct Answer:
A
— Increases
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Q. If a sound source moves towards an observer, what effect does it have on the frequency heard by the observer?
-
A.
Decreases
-
B.
Increases
-
C.
Remains the same
-
D.
Becomes zero
Solution
The frequency increases due to the Doppler effect when the source moves towards the observer.
Correct Answer:
B
— Increases
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Q. If a sound source moves towards an observer, what happens to the frequency heard by the observer?
-
A.
Increases
-
B.
Decreases
-
C.
Remains the same
-
D.
Becomes zero
Solution
The frequency increases due to the Doppler effect when the source moves towards the observer.
Correct Answer:
A
— Increases
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Q. If a sound wave travels 1 km in 3 seconds, what is its speed?
-
A.
300 m/s
-
B.
1000 m/s
-
C.
333 m/s
-
D.
500 m/s
Solution
Speed = Distance/Time = 1000 m / 3 s = 333.33 m/s, approximately 333 m/s.
Correct Answer:
A
— 300 m/s
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Q. If a sound wave travels from air into water, what happens to its speed?
-
A.
Increases
-
B.
Decreases
-
C.
Remains the same
-
D.
Becomes zero
Solution
Sound travels faster in water than in air due to higher density.
Correct Answer:
A
— Increases
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Q. In which medium does sound travel the slowest?
-
A.
Air
-
B.
Water
-
C.
Steel
-
D.
Vacuum
Solution
Sound travels slowest in air compared to water and solids like steel.
Correct Answer:
A
— Air
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Q. What is the decibel level of a sound that is 10 times more intense than a reference sound at 0 dB?
-
A.
10 dB
-
B.
20 dB
-
C.
30 dB
-
D.
40 dB
Solution
The decibel scale is logarithmic; a sound 10 times more intense is 10 dB.
Correct Answer:
A
— 10 dB
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Q. What is the decibel level of a sound that is 10 times more intense than the reference level of 0 dB?
-
A.
10 dB
-
B.
20 dB
-
C.
30 dB
-
D.
40 dB
Solution
A sound that is 10 times more intense than the reference level is 10 dB.
Correct Answer:
A
— 10 dB
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Q. What is the decibel level of a sound that is perceived as the threshold of hearing? (2022)
-
A.
0 dB
-
B.
10 dB
-
C.
20 dB
-
D.
30 dB
Solution
The threshold of hearing is defined as 0 dB.
Correct Answer:
A
— 0 dB
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Q. What is the effect called when sound waves spread out after passing through a narrow opening? (2019)
-
A.
Reflection
-
B.
Refraction
-
C.
Diffraction
-
D.
Interference
Solution
The spreading out of sound waves after passing through a narrow opening is known as diffraction.
Correct Answer:
C
— Diffraction
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Q. What is the frequency of a sound wave with a wavelength of 2 meters traveling at 340 m/s?
-
A.
170 Hz
-
B.
340 Hz
-
C.
680 Hz
-
D.
3400 Hz
Solution
Frequency = Speed / Wavelength = 340 m/s / 2 m = 170 Hz.
Correct Answer:
A
— 170 Hz
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Q. What is the phenomenon called when sound waves bounce off a surface? (2021)
-
A.
Refraction
-
B.
Reflection
-
C.
Diffraction
-
D.
Interference
Solution
The bouncing back of sound waves from a surface is called reflection.
Correct Answer:
B
— Reflection
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Q. What is the relationship between the amplitude of a sound wave and its loudness?
-
A.
Directly proportional
-
B.
Inversely proportional
-
C.
No relationship
-
D.
Exponential relationship
Solution
The loudness of a sound is directly proportional to the amplitude of the sound wave.
Correct Answer:
A
— Directly proportional
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Q. What is the threshold of hearing in decibels?
-
A.
0 dB
-
B.
10 dB
-
C.
20 dB
-
D.
30 dB
Solution
The threshold of hearing is defined as 0 dB.
Correct Answer:
A
— 0 dB
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Q. What phenomenon occurs when sound waves bounce off a surface?
-
A.
Refraction
-
B.
Diffraction
-
C.
Reflection
-
D.
Absorption
Solution
The bouncing back of sound waves from a surface is called reflection.
Correct Answer:
C
— Reflection
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Q. Which of the following frequencies is considered ultrasonic?
-
A.
20 Hz
-
B.
20 kHz
-
C.
20 MHz
-
D.
200 Hz
Solution
Ultrasonic sound refers to frequencies above 20 kHz.
Correct Answer:
B
— 20 kHz
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Q. Which of the following is a characteristic of sound waves? (2023)
-
A.
Transverse waves
-
B.
Longitudinal waves
-
C.
Electromagnetic waves
-
D.
Static waves
Solution
Sound waves are longitudinal waves, where the particle displacement is parallel to the direction of wave propagation.
Correct Answer:
B
— Longitudinal waves
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Q. Which of the following materials has the highest speed of sound?
-
A.
Air
-
B.
Water
-
C.
Steel
-
D.
Wood
Solution
Sound travels fastest in solids; hence, the speed of sound in steel is higher than in air, water, or wood.
Correct Answer:
C
— Steel
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Q. Which of the following materials is the best conductor of sound?
-
A.
Air
-
B.
Water
-
C.
Steel
-
D.
Wood
Solution
Sound travels fastest in solids, and steel is a solid material that conducts sound well.
Correct Answer:
C
— Steel
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Q. Which of the following materials would sound travel fastest through? (2019)
-
A.
Air
-
B.
Water
-
C.
Steel
-
D.
Wood
Solution
Sound travels fastest through solids like steel due to closely packed molecules.
Correct Answer:
C
— Steel
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