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Sound Waves Characteristics and Applications

CBSE · Class 9 · Science

Practice quiz for Sound Waves Characteristics and Applications — CBSE Class 9 Science. MCQs and questions with answers to test your preparation.

77 questions80 flashcards5 concepts

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An illustration showing a block being pulled by a constant force F at an angle theta to the horizontal displacement S, with the formula W = F ⋅ S = FS cosθ.
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Quick Quiz: Sound Waves Characteristics and Applications

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1

A sound wave travels in a medium with wavelength 3 m and frequency 120 Hz. What is its speed?

2

A sound wave has speed 340 m/s and frequency 20 Hz. What is its wavelength?

3

A sound wave in steel has speed 5000 m/s and wavelength 50 m. What are its frequency and time period?

4

A sound wave has 18 oscillations in 6 seconds. What are its frequency and time period?

77 Questions·
multiple choicemultiple correcttrue falseassertion reasoningnumerical

Sample Questions

1multiple choice
3 marks

A sonar signal returns after 0.80 s. If the speed of sound in water is 1500 m/s, how far is the object from the sonar?

Show answer

600 m

The 0.80 s is round-trip time. One-way time = 0.80 / 2 = 0.40 s. Distance = speed × time = 1500 × 0.40 = 600 m.

2multiple choice
3 marks

An echo is heard 0.6 s after shouting near a wall. If the speed of sound in air is 340 m/s, what is the distance from the wall?

Show answer

102 m

The sound travels to the wall and back in 0.6 s. One-way time = 0.6 / 2 = 0.3 s. Distance = 340 × 0.3 = 102 m.

3multiple choice
3 marks

A sound wave moves with speed 344 m/s and frequency 20000 Hz. What is its wavelength?

Show answer

0.0172 m

Use λ = v / ν = 344 / 20000 = 0.0172 m.

4multiple choice
3 marks

Sound travels 340 m in 1 second in air. How far does it travel in 0.1 s, and what is the minimum echo distance from the wall?

Show answer

34 m and 17 m

Distance in 0.1 s = 340 × 0.1 = 34 m. This is the round-trip distance. Minimum wall distance = 34 / 2 = 17 m.

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Frequently Asked Questions

What are the important topics in Sound Waves Characteristics and Applications for CBSE Class 9 Science?
Sound Waves Characteristics and Applications covers several key topics that are frequently asked in CBSE 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 Sound Waves Characteristics and Applications — CBSE Class 9 Science?
Understand the core concepts first, then work through the 77 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

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

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