Waves and Oscillations Practice Questions
HSC/SSC (Bangladesh) · HSC Physics · 138 free MCQs with instant results and detailed explanations.
138
Total
40
Easy
77
Medium
21
Hard
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Sample Questions from Waves and Oscillations
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Q1
Easy
A tuning fork produces a sound wave of frequency 440 Hz. What is the wavelength of the sound in air, if the speed of sound is approximately 340 m/s?
A.
0.77 m
B.
0.85 m
C.
1.11 m
D.
1.24 m
Show Answer & Explanation
Correct Answer: A
Wavelength can be calculated using the formula: wavelength = speed / frequency. Here, wavelength = 340 m/s / 440 Hz = 0.7727 m, approximately 0.77 m.
Q2
Easy
If a pendulum swings back and forth with a period of 2 seconds, how many complete oscillations does it make in one minute?
A.
15
B.
30
C.
45
D.
60
Show Answer & Explanation
Correct Answer: B
The number of oscillations can be found by dividing the total time by the period. In one minute (60 seconds), the pendulum makes 60/2 = 30 oscillations.
Q3
Easy
What is the frequency of a wave if its period is 0.02 seconds?
A.
50 Hz
B.
100 Hz
C.
200 Hz
D.
25 Hz
Show Answer & Explanation
Correct Answer: A
Frequency is the reciprocal of the period. Therefore, frequency (f) = 1/period (T). Here, f = 1/0.02 = 50 Hz.
Q4
Medium
Which of the following statements about simple harmonic motion (SHM) is true?
A.
The acceleration is always directed away from the mean position.
B.
The period depends on the amplitude of oscillation.
C.
The velocity is zero at the maximum displacement.
D.
The total energy is not conserved in SHM.
Show Answer & Explanation
Correct Answer: C
In SHM, the velocity is indeed zero at the maximum displacement because the object momentarily stops before changing direction.
Q5
Medium
A tuning fork vibrates at a frequency of 440 Hz. If the speed of sound in air is approximately 340 m/s, what is the wavelength of the sound produced?
A.
0.77 m
B.
0.85 m
C.
0.68 m
D.
0.90 m
Show Answer & Explanation
Correct Answer: A
Using the formula ฮป = v/f, ฮป = 340 m/s / 440 Hz = 0.7727 m, which rounds to 0.77 m.
Q6
Medium
If a wave has an amplitude of 3 cm and a frequency of 50 Hz, what is the maximum displacement from the mean position?
A.
3 cm
B.
150 cm
C.
50 cm
D.
6 cm
Show Answer & Explanation
Correct Answer: A
The maximum displacement in wave motion is represented by its amplitude. Therefore, the maximum displacement from the mean position is equal to the amplitude, which is 3 cm.
Q7
Medium
Which of the following statements is true about a wave in a vacuum?
A.
It requires a medium to propagate.
B.
It travels faster than in any medium.
C.
It cannot exist in a vacuum.
D.
It has a fixed wavelength only.
Show Answer & Explanation
Correct Answer: B
Waves, such as electromagnetic waves, can travel through a vacuum and do so at the speed of light, which is faster than in any medium.
Q8
Hard
A wave traveling along a string has a frequency of 50 Hz and a wavelength of 2 meters. What is the speed of the wave?
A.
100 m/s
B.
150 m/s
C.
25 m/s
D.
50 m/s
Show Answer & Explanation
Correct Answer: A
The speed of a wave is given by the formula v = f * ฮป, where v is speed, f is frequency, and ฮป is wavelength. Here, v = 50 Hz * 2 m = 100 m/s.
Q9
Hard
A simple harmonic oscillator has a mass of 0.5 kg and a spring constant of 200 N/m. What is the maximum speed of the mass if it is displaced by 0.1 m from the equilibrium position?
A.
1 m/s
B.
2 m/s
C.
0.5 m/s
D.
0.25 m/s
Show Answer & Explanation
Correct Answer: B
The maximum speed (v_max) in simple harmonic motion is given by v_max = ฯ * A, where ฯ = โ(k/m) and A is the amplitude. Here, ฯ = โ(200/0.5) = 20 m/sยฒ, and A = 0.1 m, leading to v_max = 20 * 0.1 = 2 m/s.
Q10
Hard
A wave traveling along a string has a frequency of 50 Hz and a wavelength of 2 meters. What is the speed of the wave?
A.
100 m/s
B.
50 m/s
C.
25 m/s
D.
75 m/s
Show Answer & Explanation
Correct Answer: A
Wave speed (v) is calculated using the formula v = frequency (f) ร wavelength (ฮป). Here, v = 50 Hz ร 2 m = 100 m/s.
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Waves and Oscillations โ HSC/SSC (Bangladesh) HSC Physics Practice Questions Online
This page contains 138 practice MCQs for the chapter Waves and Oscillations in HSC/SSC (Bangladesh) HSC Physics. The questions are organized by difficulty โ 40 easy, 77 medium, 21 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.