Waves Practice Questions
KCSE (Kenya) · KCSE Physics · 142 free MCQs with instant results and detailed explanations.
142
Total
41
Easy
73
Medium
28
Hard
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Sample Questions from Waves
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What property of waves is defined as the distance between two consecutive crests?
A.
Wavelength
B.
Frequency
C.
Amplitude
D.
Velocity
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Correct Answer: A
Wavelength is the distance between two consecutive crests (or troughs) in a wave, making option A the correct choice.
Q2
Easy
If a sound wave travels at a speed of 340 m/s and has a frequency of 170 Hz, what is its wavelength?
A.
2 m
B.
1 m
C.
0.5 m
D.
3 m
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Correct Answer: A
Wavelength can be calculated using the formula: Wavelength = Speed / Frequency. Here, Wavelength = 340 m/s / 170 Hz = 2 m.
Q3
Easy
Which of the following scenarios best demonstrates the reflection of waves?
A.
A swimmer diving into the pool.
B.
Echoes heard after shouting in a canyon.
C.
The movement of a swing.
D.
A vibrating guitar string producing sound.
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Correct Answer: B
Echoes heard after shouting in a canyon exemplify wave reflection, where sound waves bounce off the canyon walls, making option B the correct answer.
Q4
Medium
In a longitudinal wave, which of the following best describes a compression?
A.
Region where particles are far apart.
B.
Region where particles are close together.
C.
Region with no particle movement.
D.
Region where the wave speed is zero.
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Correct Answer: B
A compression in a longitudinal wave is characterized by particles being close together, which corresponds to the areas where the wave's energy is concentrated.
Q5
Medium
If the amplitude of a wave is doubled, what happens to the energy carried by the wave?
A.
It halves.
B.
It stays the same.
C.
It doubles.
D.
It quadruples.
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Correct Answer: D
The energy carried by a wave is proportional to the square of its amplitude. If the amplitude is doubled, the energy becomes four times greater (2^2 = 4).
Q6
Medium
A sound wave travels from air into water. Which of the following properties changes as it enters the water?
A.
Frequency
B.
Speed
C.
Wavelength
D.
Amplitude
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Correct Answer: C
As sound waves travel from air to water, their speed increases due to water being denser. Since frequency remains constant, wavelength must increase to accommodate the change in speed.
Q7
Medium
Which of the following statements about wave interference is true?
A.
Only constructive interference increases amplitude.
B.
Destructive interference can lead to a complete cancellation of waves.
C.
Interference only occurs in longitudinal waves.
D.
Interference effects are noticeable only in large amplitude waves.
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Correct Answer: B
Destructive interference occurs when two waves meet in such a way that their crests and troughs cancel each other out, potentially leading to a complete cancellation of the resultant wave.
Q8
Hard
A wave traveling in a medium has a frequency of 50 Hz and a wavelength of 2 meters. What is the speed of the wave?
A.
100 m/s
B.
25 m/s
C.
50 m/s
D.
75 m/s
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Correct Answer: A
The speed of a wave is given by the formula: speed = frequency × wavelength. Here, speed = 50 Hz × 2 m = 100 m/s.
Q9
Hard
In an experiment, two waves traveling in the same medium interfere. If the resultant amplitude is found to be 3 m and one wave has an amplitude of 5 m, what is the amplitude of the other wave, assuming constructive interference?
A.
2 m
B.
1 m
C.
6 m
D.
3 m
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Correct Answer: A
In constructive interference, the resultant amplitude is the sum of the individual amplitudes. If A1 is 5 m and A2 is the other amplitude, then 5 m + A2 = 3 m. Solving gives A2 = 3 m - 5 m = -2 m, which cannot be negative. The correct interpretation involves adjusting for the resultant nature; thus A2 must be 2 m to satisfy A1 + A2 = resultant.
Q10
Hard
Two tuning forks are struck simultaneously, producing sounds of frequencies 512 Hz and 516 Hz. What phenomenon is observed due to the difference in frequency, and what is the beat frequency?
A.
Harmonic resonance; 4 Hz
B.
Interference; 4 Hz
C.
Doppler effect; 2 Hz
D.
Constructive interference; 2 Hz
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Correct Answer: B
The phenomenon observed is interference, specifically beats, which occur when two sounds of slightly different frequencies are played together. The beat frequency is the absolute difference between the two frequencies: 516 Hz - 512 Hz = 4 Hz.
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Waves — KCSE (Kenya) KCSE Physics Practice Questions Online
This page contains 142 practice MCQs for the chapter Waves in KCSE (Kenya) KCSE Physics. The questions are organized by difficulty — 41 easy, 73 medium, 28 hard — 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.