Class 9 Science Chapter 10: Sound Waves: Characteristics and Applications — practice questions with answers
Free practice for Class 9 Science, Chapter 10: Sound Waves: Characteristics and Applications. Try the solved questions below, then take a free test with instant marking and explanations.
56 questions22 easy, 26 medium, 8 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. A stretched rubber band makes sound only while it is moving to and fro. What does this show?
- Sound is produced by vibrations
- Sound needs light
- Sound is produced by heat
- Rubber makes sound when still
Show answer
Answer: A. Sound is produced by vibrations
Why: When vibration stops, sound stops. [p.185]
Why: When vibration stops, sound stops. [p.185]
Q2. A vibrating tuning fork touches water. What do you see, and what does it show?
- Ripples form, showing the prongs are vibrating
- Nothing happens
- The water boils
- The fork stops making sound immediately
Show answer
Answer: A. Ripples form, showing the prongs are vibrating
Why: Vibrations disturb the water. [p.186]
Why: Vibrations disturb the water. [p.186]
Q3. You hear tapping clearly with your ear pressed to a table. What does this show?
- Sound can travel through solids
- Sound only travels in air
- Tables make sound
- Ears work better on wood
Show answer
Answer: A. Sound can travel through solids
Why: Sound also travels through liquids. [p.187]
Why: Sound also travels through liquids. [p.187]
Q4. What is a compression in a sound wave?
- A region where particles of the medium are crowded and density is higher
- A region of lower density
- A region with no particles
- The source of sound
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Answer: A. A region where particles of the medium are crowded and density is higher
Why: A rarefaction has lower density. [p.189, p.193]
Why: A rarefaction has lower density. [p.189, p.193]
Q5. On a graph of density against distance for a sound wave, what is the distance between two consecutive crests called?
- Wavelength
- Amplitude
- Frequency
- Time period
Show answer
Answer: A. Wavelength
Why: Symbol λ, unit metre. [p.194]
Why: Symbol λ, unit metre. [p.194]
Q6. 10 density oscillations happen at a point in 2 seconds. What is the frequency (Hz)?
Show answer
Answer: 5 (± 0)
Why: 10 ÷ 2 = 5 Hz. [p.195]
Why: 10 ÷ 2 = 5 Hz. [p.195]
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Frequently asked questions
How many practice questions are there for Class 9 Science Chapter 10: Sound Waves: Characteristics and Applications?
56 questions (22 easy, 26 medium, 8 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 9 Science syllabus, used by CBSE and many state boards.