Practise 21 real Federal Board questions on Sound from 2023 to 2026. See the answer and explanation as soon as you answer.
Sound is one of the 16 main chapters in our Federal Board Matric Physics question bank (10th class), and about 5% of its real questions come from it. Tayyari Karo has 21 real questions on this chapter from 2023 to 2026; 7 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 20 easy, 1 medium.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
Compression and rarefaction are features of ________ waves.
Answer: A. Longitudinal
In longitudinal waves (e.g. sound) particles vibrate along the direction of travel, forming compressions and rarefactions.
Sound travels faster in solids than in gases mainly because solids have:
Answer: B. Higher density
Particles in a solid are closely packed (higher density and much greater elasticity), so vibrations pass on more quickly.
Multiple reflection of sound that cannot be distinguished from original sound are called:
Answer: A. Reverberations
Reverberation is the persistence of sound due to multiple reflections arriving within 0.1 s.
What causes the difference in pitch between two sounds?
Answer: A. Their frequencies
Pitch depends on frequency; amplitude decides loudness.
The sound energy passing per unit area per second is measured in:
Answer: B. W/m²
Intensity of sound = power/area, unit W m⁻². dB is the unit of intensity level.
Human ear can respond to the intensity of:
Answer: B. 10⁻¹² W m⁻² to 1 W m⁻²
Threshold of hearing = 10⁻¹² W m⁻²; threshold of pain = 1 W m⁻².
What is echo? How is it produced?
An echo is a repeated sound heard after the original sound because of reflection of sound from a large hard surface such as a wall, cliff or building.
It is produced when sound waves strike a reflecting surface and return to the listener. Since the ear can separate two sounds only if they arrive at least 0.1 s apart (persistence of hearing), the surface must be at least 17 m away (2d = 340 × 0.1 m) for a distinct echo to be heard.
Write SI units of the following physical quantities related to sound: (i) intensity, (ii) intensity level, (iii) frequency.
(i) Intensity — watt per square metre (W m⁻²)
(ii) Intensity level — decibel (dB) (larger unit: bel)
(iii) Frequency — hertz (Hz), i.e. vibrations per second
| Session | Questions |
|---|---|
| 2026 Annual | 4 |
| 2025 1st Annual | 4 |
| 2025 2nd Annual | 5 |
| 2024 Annual | 5 |
| 2023 Annual | 3 |
21 real Federal Board (FBISE) Physics questions on Sound from 2023 to 2026, for 10th class. Each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
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