Last Updated on May 15, 2025 by XAM CONTENT
Understanding the key concepts of Class 9 Science Chapter 11 – Sound is crucial for exam success. To make your revision easier, we have created chapterwise mcq questions with Answers for class 9 Science based on the latest syllabus and exam pattern. It is a part of MCQ Questions for CBSE Class 9 Science Series.
These multiple-choice questions will help you assess your knowledge, improve accuracy, and boost confidence for your exams. Whether you are preparing for school tests, online tests or competitive exams, these Sound MCQs will strengthen your conceptual clarity.
| Chapter | Sound |
| Book | Science Textbook for Class 9 |
| Type of Questions | MCQ Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 9 |
| Subject | Science |
| Useful for | Class 9 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 9 Science Chapterwise MCQ Questions |
MCQ Questions on Sound Class 9 Science
MCQs
Q1. Which of the following is essential for the propagation of sound?
(a) Light
(b) Vacuum
(c) Medium
(d) Energy
Show Answer
Answer: (c)
Explanation: Sound requires a material medium (solid, liquid, or gas) to propagate; it cannot travel through vacuum.
Q2. Why can’t sound travel through vacuum?
(a) There’s no gravity
(b) Sound is a mechanical wave
(c) Light travels faster
(d) Air absorbs sound
Show Answer
Answer: (b)
Explanation: Sound is a mechanical wave and needs particles of a medium to propagate.
Q3. Which wave property determines the pitch of a sound?
(a) Amplitude
(b) Frequency
(c) Wavelength
(d) Speed
Show Answer
Answer: (b)
Explanation: Pitch depends on frequency; higher frequency means higher pitch.
Q4. Which physical quantity does the amplitude of a sound wave affect?
(a) Speed
(b) Frequency
(c) Loudness
(d) Wavelength
Show Answer
Answer: (c)
Explanation: Greater amplitude results in louder sound.
Q5. What is the time period of a sound wave with frequency 200 Hz?
(a) 0.02 s
(b) 0.005 s
(c) 0.2 s
(d) 0.002 s
Show Answer
Answer: (a)
Explanation: T = 1/f = 1/200 = 0.005 s.
Q6. What kind of wave is a sound wave in air?
(a) Transverse
(b) Electromagnetic
(c) Longitudinal
(d) Torsional
Show Answer
Answer: (c)
Explanation: Sound travels in air as longitudinal waves where particles oscillate parallel to wave propagation.
Q7. Which of these materials allows sound to travel the fastest?
(a) Water
(b) Air
(c) Iron
(d) Wood
Show Answer
Answer: (c)
Explanation: Sound travels fastest in solids; among the given options, iron has the highest speed of sound.
Q8. What is the minimum distance for an echo to be heard distinctly?
(a) 34.4 m
(b) 17.2 m
(c) 10 m
(d) 1 m
Show Answer
Answer: (b)
Explanation: For distinct echo, the reflecting surface must be at least 17.2 m away (speed = 344 m/s, time ≥ 0.1 s).
Q9. Which device uses multiple reflections of sound to amplify heartbeats?
(a) Loudspeaker
(b) Megaphone
(c) Microphone
(d) Stethoscope
Show Answer
Answer: (d)
Explanation: Stethoscopes amplify sound from the body using multiple reflections in the tubes.
Q10. Which of the following is not an application of ultrasound?
(a) Breaking kidney stones
(b) Detecting metal flaws
(c) Solar energy collection
(d) Imaging internal organs
Show Answer
Answer: (c)
Explanation: Ultrasound has no role in solar energy; it is used in medical and industrial diagnostics.
Q11. Why are ceilings of concert halls curved?
(a) To absorb sound
(b) To reflect sound uniformly
(c) To reduce heat
(d) To block light
Show Answer
Answer: (b)
Explanation: Curved ceilings reflect sound uniformly, ensuring clear audibility throughout the hall.
Q12. Which part of the wave corresponds to high pressure in sound waves?
(a) Rarefaction
(b) Crest
(c) Compression
(d) Trough
Show Answer
Answer: (c)
Explanation: Compression represents a region of high pressure where particles are close together.
Q13. What is the range of audible frequencies for humans?
(a) 2 Hz to 20 Hz
(b) 20 Hz to 20 kHz
(c) 20 kHz to 200 kHz
(d) 10 Hz to 100 Hz
Show Answer
Answer: (b)
Explanation: Humans can typically hear sounds between 20 Hz and 20,000 Hz (20 kHz).
Q14. Which wave property does not change when sound travels from air to water?
(a) Speed
(b) Wavelength
(c) Frequency
(d) Amplitude
Show Answer
Answer: (c)
Explanation: Frequency of sound remains constant across different media.
Q15. Which of these sounds is ultrasonic?
(a) 15 Hz
(b) 15 kHz
(c) 25 kHz
(d) 150 Hz
Show Answer
Answer: (c)
Explanation: Ultrasonic sound has frequency above 20,000 Hz (20 kHz).
Q16. Which of these waves can travel through vacuum?
(a) Sound
(b) Light
(c) Ultrasound
(d) Infrasound
Show Answer
Answer: (b)
Explanation: Light is an electromagnetic wave and can travel through vacuum, unlike sound.
Q17. Which property of sound remains same regardless of the source?
(a) Speed
(b) Frequency
(c) Amplitude
(d) Pitch
Show Answer
Answer: (a)
Explanation: Speed depends on the medium, not on the source or the wave’s properties.
Q18. Which of the following can be used to measure depth of oceans?
(a) Infrasound
(b) Stethoscope
(c) Megaphone
(d) SONAR
Show Answer
Answer: (d)
Explanation: SONAR uses ultrasound to detect depth by measuring the time of echo return.
Q19. Which of these factors directly affects the loudness of a sound?
(a) Frequency
(b) Speed
(c) Amplitude
(d) Wavelength
Show Answer
Answer: (c)
Explanation: Loudness is directly proportional to the amplitude of the wave.
Q20. Sound travels fastest in:
(a) Air
(b) Water
(c) Hydrogen
(d) Iron
Show Answer
Answer: (d)
Explanation: Sound travels fastest in solids, and iron has a high speed of sound among the options.
We hope the given mcq questions with Answers for Sound Class 9 helps you in your learning.
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Topics from which mcq questions may be asked
- Production of sound
- Characteristics of sound waves
- Speed, reflection and applications
Sound is energy in motion – helping us communicate, sense, and enjoy music.
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Frequently Asked Questions (FAQs) on Sound MCQ Questions
Q1: What are MCQ questions in Class 9 Science?
A1: MCQ (Multiple Choice Questions) in Class 9 Science are objective-type questions where students choose the correct answer from four options. They test conceptual understanding, application, and reasoning skills.
Q2: Are these Class 9 Science MCQs based on the latest CBSE syllabus?
A2: Yes, all MCQ questions provided are strictly based on the latest CBSE Class 9 Science syllabus and follow the current NCERT textbook.
Q3: Are Class 9 Science MCQ questions useful for board exam preparation?
A3: Yes, practicing MCQ questions helps build strong conceptual understanding and improves performance in school tests, Olympiads, and board-level competency assessments.
Q4: Do these MCQs include answers and explanations?
A4: Absolutely. Each MCQ question includes the correct answer along with a detailed explanation to help students understand the concept behind the question.
Q5: Where can I find the best MCQ questions for Class 9 Science?
A5: You can find high-quality, CBSE-based MCQ questions for Class 9 Science on trusted educational websites like xamcontent.com. These include chapterwise, topicwise, and competency-based questions aligned with the latest syllabus
Q6: Are there any resources available online for students to practice mcq questions on class 9 science chapter 11 “Sound“ for CBSE exams?
A6: Yes, several educational websites offer mcq questions for CBSE students preparing for science examinations. We also offer a collection of mcq questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. for more mcq, you can also visit Physics Gurukul Website.
