Waves and Sound Practice Questions
Thanaweya Amma (Egypt) · Thanaweya Physics · 140 free MCQs with instant results and detailed explanations.
140
Total
37
Easy
74
Medium
29
Hard
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Sample Questions from Waves and Sound
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Q1
Easy
What is the speed of sound in air at room temperature (20°C)?
A.
343 m/s
B.
299,792,458 m/s
C.
1500 m/s
D.
880 m/s
Show Answer & Explanation
Correct Answer: A
The speed of sound in air at room temperature is approximately 343 m/s. This is a well-established value used in physics for sound propagation in air.
Q2
Easy
If a sound wave has a frequency of 440 Hz, what is its wavelength in air? (Assume speed of sound = 343 m/s)
A.
0.78 m
B.
1.56 m
C.
0.43 m
D.
1.00 m
Show Answer & Explanation
Correct Answer: A
To find the wavelength, use the formula: wavelength = speed of sound / frequency. Here, wavelength = 343 m/s / 440 Hz = 0.78 m.
Q3
Easy
What is the frequency of a wave if its wavelength is 2 meters and the speed of the wave is 10 m/s?
A.
5 Hz
B.
2 Hz
C.
20 Hz
D.
10 Hz
Show Answer & Explanation
Correct Answer: A
Frequency is calculated using the formula: frequency = speed / wavelength. Here, frequency = 10 m/s ÷ 2 m = 5 Hz.
Q4
Medium
What happens to the wavelength of a wave if its frequency doubles while the speed remains constant?
A.
The wavelength becomes half.
B.
The wavelength doubles.
C.
The wavelength remains the same.
D.
The wavelength increases by a quarter.
Show Answer & Explanation
Correct Answer: A
According to the wave equation, wave speed = frequency × wavelength. If the frequency doubles and speed stays constant, the wavelength must halve to maintain the equation's balance.
Q5
Medium
A sound wave travels through air at a speed of 340 m/s. If the frequency of the sound wave is 1700 Hz, what is its wavelength?
A.
0.2 m
B.
0.5 m
C.
2 m
D.
1.5 m
Show Answer & Explanation
Correct Answer: A
Wavelength can be calculated using the formula: wavelength = speed / frequency. Substituting the values gives wavelength = 340 m/s / 1700 Hz = 0.2 m.
Q6
Medium
When a tuning fork is struck, it produces a sound wave with a frequency of 440 Hz. If the wave travels through water where the speed is 1480 m/s, what is the wavelength of the sound wave?
A.
3.36 m
B.
2.1 m
C.
0.67 m
D.
0.95 m
Show Answer & Explanation
Correct Answer: A
Using the formula wavelength = speed / frequency, substituting the values gives wavelength = 1480 m/s / 440 Hz = 3.36 m.
Q7
Medium
If a wave traveling through a medium has an amplitude of 5 cm and it causes a particle in the medium to move 3 cm from its equilibrium position, what is the maximum displacement of the particle?
A.
5 cm
B.
3 cm
C.
2 cm
D.
8 cm
Show Answer & Explanation
Correct Answer: A
The maximum displacement in the particle's motion equals the wave's amplitude, which is 5 cm. Thus, the maximum displacement is 5 cm.
Q8
Hard
A sound wave travels through air at a speed of 343 m/s. If the frequency of this sound wave is 686 Hz, what is the wavelength of the sound wave?
A.
0.5 m
B.
1.0 m
C.
2.0 m
D.
1.5 m
Show Answer & Explanation
Correct Answer: A
The wavelength can be calculated using the formula: wavelength = speed / frequency. Thus, wavelength = 343 m/s / 686 Hz = 0.5 m.
Q9
Hard
A tuning fork produces a sound of frequency 512 Hz. If it is placed in a medium where the speed of sound is 2560 m/s, what is the time period of the sound wave produced?
A.
0.002 s
B.
0.004 s
C.
0.008 s
D.
0.016 s
Show Answer & Explanation
Correct Answer: B
The time period (T) is the reciprocal of frequency (f). Therefore, T = 1 / f = 1 / 512 Hz = 0.001953125 s, which rounds to approximately 0.004 s.
Q10
Hard
A sound wave travels through air at a speed of 340 m/s. If the frequency of the wave is 170 Hz, what is the wavelength of the sound wave?
A.
2 m
B.
1.5 m
C.
0.5 m
D.
3 m
Show Answer & Explanation
Correct Answer: A
The wavelength of a sound wave can be calculated using the formula: wavelength = speed / frequency. Here, wavelength = 340 m/s / 170 Hz = 2 m.
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Waves and Sound — Thanaweya Amma (Egypt) Thanaweya Physics Practice Questions Online
This page contains 140 practice MCQs for the chapter Waves and Sound in Thanaweya Amma (Egypt) Thanaweya Physics. The questions are organized by difficulty — 37 easy, 74 medium, 29 hard — so you can choose the right level for your preparation.
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