Class 9
Science
Chapter 10
Exploration (latest NCERT)
Sound Waves: Characteristics and Applications
Free NCERT practice questions for Class 9 Science, Chapter 10 — 93 questions across MCQs, short-answer, long-answer, numericals and more. Download a printable PDF worksheet in seconds. No signup, no ads, no paywall.
What this chapter covers
Class 9 Science Chapter 10 'Sound Waves: Characteristics and Applications' from NCERT Exploration studies sound as a longitudinal mechanical wave. Students learn wavelength, frequency, amplitude, speed and the relation v = ν·λ, compare audible, ultrasonic and infrasonic ranges, and explore reflection of sound (echo, reverberation, SONAR). The chapter has many wave numerical problems.
Key topics in this chapter
- Sound as a longitudinal wave
- Wavelength, frequency, amplitude
- Speed of sound: v = ν·λ
- Audible, ultrasonic, infrasonic
- Echo, reverberation, SONAR
Sample questions from this chapter
Here are 6 real questions students will encounter when they generate a worksheet for this chapter. Every question includes the answer.
MCQ
Medium
1 mark
Sound is a __________ wave.
(a) Transverse
(b) Longitudinal mechanical
(c) Electromagnetic
(d) Light
Answer: Longitudinal mechanical
Short Answer
Medium
3 marks
Why can sound not travel through a vacuum?
Answer: • Sound is a mechanical wave.
• It needs particles of a medium to pass on the vibration.
• A vacuum has no particles, so sound cannot travel.
Fill in the Blank
Medium
1 mark
Sound below 20 Hz is __________ and above 20 kHz is ultrasonic.
Answer: infrasonic
Numerical
Medium
3 marks
A source produces a sound wave of wavelength 3.44 m travelling at 344 m/s. Find its frequency and time period.
Answer: • f = v/λ = 344/3.44 = 100 Hz.
• T = 1/f = 1/100 = 0.01 s.
Very Short
Medium
1 mark
In sound propagation, what actually travels through the medium?
Answer: The density disturbance (not the particles themselves).
True / False
Medium
1 mark
State True or False: Sound travels faster in solids than in gases.
Answer: True.
Generate a worksheet with all 93 questions →
Frequently asked questions
What is included in Class 9 Science Chapter 10 (Sound Waves: Characteristics and Applications)?
This chapter has 93 NCERT-aligned practice questions covering all the concepts from the Exploration textbook's Chapter 10. Questions span easy, medium and hard levels across 10 different formats so students get a balanced practice set.
Are these questions based on the new NCERT Exploration textbook?
Yes. Every question on Practico for Class 9 Science is mapped directly to the latest NCERT Exploration textbook (the one CBSE schools are using now). The chapter numbers and chapter titles match the textbook exactly.
How many questions can I practice from this chapter?
93 questions are available right now. You can pick how many you want at a time — generate 10 quick MCQs, a 30-question worksheet, or a full exam-style mix. Each generation gives you a different random set.
Can I download a free PDF worksheet for Sound Waves: Characteristics and Applications?
Yes — completely free, no sign-up required. Pick this chapter, choose the number of questions and types you want, and download a printable PDF (with or without answers) in one click.
What question types are available?
This chapter has assertion reason, fill blank, image, long, match, mcq, numerical, short, true false, very short. You can mix any combination, or filter to just the type you want to practice — for example, only numericals to drill calculation, or only short-answer questions for exam revision.
Is Practico aligned with CBSE exam patterns?
Yes. Practico questions are tagged by marks (1, 2, 3, 5) and by difficulty (Easy/Medium/Hard) just like CBSE exam blueprints, so you can build a worksheet that mirrors a real unit test or annual exam.