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Important Questions

Propagation of Sound waves

ICSE · Class 9 · Physics

Most important questions from Propagation of Sound waves for ICSE Class 9 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.

40 questions36 flashcards5 concepts

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A labeled diagram showing a stretched string being plucked, illustrating how its vibrations produce sound. The string should be shown in its resting and vibrating states.
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40 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice

What is the audible range of frequency for humans?

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20 Hz to 20,000 Hz

The human ear can detect sound frequencies from 20 Hz to 20,000 Hz (20 kHz). Sounds below 20 Hz are infrasonic, and sounds above 20 kHz are ultrasonic, both of which humans cannot hear.

2multiple correct

Which factors affect the speed of sound in air?

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Temperature, Humidity, Wind direction

Temperature, humidity, and wind direction all affect sound speed in air. Higher temperature increases speed, humidity increases speed, and wind can increase or decrease speed depending on direction. Amplitude and pressure do not affect sound speed.

3multiple choice

Ultrasonic waves have frequency:

Show answer

Above 20,000 Hz

Ultrasonic waves have frequencies above 20,000 Hz (20 kHz), which is beyond human hearing range. These waves are used in medical imaging, cleaning, and SONAR applications due to their high energy and directional properties.

4multiple choice

Why do we see lightning before hearing thunder?

Show answer

Light travels much faster than sound

Light travels at 3×10⁸ m/s while sound travels at only 330 m/s in air. This huge difference means light reaches us almost instantly while sound takes time to travel the same distance, causing the delay between seeing lightning and hearing thunder.

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Frequently Asked Questions

What are the important topics in Propagation of Sound waves for ICSE Class 9 Physics?
Propagation of Sound waves covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Propagation of Sound waves — ICSE Class 9 Physics?
Understand the core concepts first, then work through the 40 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Propagation of Sound waves?
There are 40 practice questions available for Propagation of Sound waves. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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