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Important Questions

Sound Waves Characteristics and Applications — Important Questions

CBSE · Class 9 · Science

77 important questions from Sound Waves Characteristics and Applications for CBSE Class 9 Science, with answers. Part of the CBSE Class 9 Science syllabus.

77 questions80 flashcards5 formulas & key relations5 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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77 Questions·
multiple choicemultiple correcttrue falseassertion reasoningnumerical

Important Questions from Sound Waves Characteristics and Applications

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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What are the important topics in Sound Waves Characteristics and Applications for CBSE Class 9 Science?
Key topics in Sound Waves Characteristics and Applications include Production and Propagation of Sound, Wave Nature, Energy, and Graphical Terms, Speed of Sound and Its Dependence on Medium, Human Hearing, Pitch, Loudness, and Voice. Study these first, then practise questions on each for Class 9 exams.
How many important questions are there in Sound Waves Characteristics and Applications?
Super Tutor has 77 practice questions for Sound Waves Characteristics and Applications, including multiple choice, multiple correct, true false, assertion reasoning, numerical questions. A sample with answers is on this page.

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

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