SEBA Class 9 Science Chapter 12 Sound MCQs (2026–27) – Assam Eduverse
The SEBA Class 9 Science Chapter 12 Sound MCQs (2026–27) are prepared strictly according to the latest ASSEB syllabus and updated board examination pattern. These SEBA Class 9 Science Chapter 12 Sound MCQs include conceptual objective questions, numerical-based MCQs, and diagram-oriented practice sets designed for effective board exam preparation.
Prepared by subject experts of Assam Eduverse, these seba class 9 science chapter 12 mcqs focus on key topics such as production and propagation of sound, characteristics of sound waves, frequency, wavelength, time period, amplitude, speed of sound, reflection of sound, echo, and applications of ultrasound. Practicing these sound mcqs class 9 seba and assam board class 9 science objective questions strengthens conceptual clarity and numerical accuracy.
Regular revision of these ASSEB Class 9 Science Important MCQs ensures strong preparation for the 2026–27 board examination and enhances performance in MCQ-based assessments.
SEBA Class 9 Science Chapter 12 Sound MCQs – ASSEB 2026–27 Board Exam Practice
Table of Contents
Q1. Sound is a form of which type of energy?
a) Light energy
b) Heat energy
c) Mechanical energy
d) Sound energy
Answer: d) Sound energy
Q2. Sound is produced due to:
a) Rotation of objects
b) Vibration of objects
c) Heating of objects
d) Breaking of objects
Answer: b) Vibration of objects
Q3. Vibration means:
a) Circular motion
b) Random motion
c) Rapid to and fro motion
d) Upward motion only
Answer: c) Rapid to and fro motion
Q4. Sound travels through a medium in the form of:
a) Transverse waves
b) Mechanical waves
c) Light waves
d) Water waves only
Answer: b) Mechanical waves
Q5. Sound cannot travel through:
a) Solids
b) Liquids
c) Gases
d) Vacuum
Answer: d) Vacuum
Q6. In a sound wave, the region of high pressure is called:
a) Rarefaction
b) Compression
c) Crest
d) Trough
Answer: b) Compression
Q7. In a sound wave, the region of low pressure is called:
a) Compression
b) Crest
c) Rarefaction
d) Peak
Answer: c) Rarefaction
Q8. Sound waves are called longitudinal waves because the particles of the medium:
a) Move in circular paths
b) Move perpendicular to wave direction
c) Move parallel to wave direction
d) Do not move at all
Answer: c) Move parallel to wave direction
Q9. The distance between two consecutive compressions or rarefactions is called:
a) Frequency
b) Time period
c) Amplitude
d) Wavelength
Answer: d) Wavelength
Q10. The SI unit of wavelength is:
a) Hertz
b) Metre
c) Second
d) Newton
Answer: b) Metre
Q11. The number of complete oscillations per unit time is called:
a) Amplitude
b) Time period
c) Frequency
d) Speed
Answer: c) Frequency
Q12. The SI unit of frequency is:
a) Second
b) Metre
c) Hertz
d) Pascal
Answer: c) Hertz
Q13. The time taken for one complete oscillation is called:
a) Frequency
b) Amplitude
c) Time period
d) Wavelength
Answer: c) Time period
Q14. The relation between frequency (ν) and time period (T) is:
a) ν = T
b) ν = 1/T
c) T = ν
d) ν = T²
Answer: b) ν = 1/T
Q15. The speed of sound is given by the formula:
a) v = f/T
b) v = λ/T
c) v = λν
d) v = T/λ
Answer: c) v = λν
Q16. Pitch of a sound depends on its:
a) Amplitude
b) Frequency
c) Speed
d) Intensity
Answer: b) Frequency
Q17. Loudness of a sound depends on its:
a) Frequency
b) Wavelength
c) Amplitude
d) Speed
Answer: c) Amplitude
Q18. The audible range of sound for an average human being is:
a) 0 Hz to 1000 Hz
b) 10 Hz to 10000 Hz
c) 20 Hz to 20000 Hz
d) 100 Hz to 50000 Hz
Answer: c) 20 Hz to 20000 Hz
Q19. Sound with frequency below 20 Hz is called:
a) Ultrasound
b) Audible sound
c) Infrasound
d) Supersonic sound
Answer: c) Infrasound
Q20. Sound with frequency above 20 kHz is called:
a) Infrasound
b) Ultrasound
c) Audible sound
d) Sonic sound
Answer: b) Ultrasound
Q21. Assertion: Sound waves are mechanical waves.
Reason: Sound waves need a material medium for propagation.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q22. Assertion: Sound cannot travel through vacuum.
Reason: There are no particles in vacuum to transfer sound energy.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q23. Assertion: The loudness of sound increases when we hit a table harder.
Reason: Greater force produces sound waves of larger amplitude.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q24. Assertion: A high pitch sound has a high frequency.
Reason: Pitch depends on frequency.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q25. Assertion: The speed of sound increases with increase in temperature.
Reason: In a medium, as temperature increases, speed of sound increases.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: b) Both A and R are true but R is not the correct explanation of A
Q26. Assertion: Echo is heard only when the reflecting surface is at least 17.2 m away (at 22°C).
Reason: The persistence of hearing in our brain is about 0.1 s.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q27. Assertion: Reverberation is undesirable in big halls.
Reason: It causes persistence of sound due to repeated reflections.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q28. Assertion: Ultrasound can be used to detect cracks in metal blocks.
Reason: Ultrasound gets reflected back from defective locations.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q29. Assertion: SONAR works on the principle of echo.
Reason: It measures the time between transmission and reception of ultrasonic waves.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q30. Assertion: Bats can fly in dark without hitting obstacles.
Reason: Bats use ultrasonic waves and detect their reflections.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q31. Which of the following statements about sound production are correct?
i) Sound is produced due to vibration of objects
ii) Sound can be produced without vibration
iii) A stretched rubber band produces sound when plucked
iv) Human voice is produced due to vibration of vocal cords
a) i, iii and iv
b) i and ii
c) ii and iii
d) i, ii, iii and iv
Answer: a) i, iii and iv
Q32. Which of the following statements about sound propagation are correct?
i) Sound needs a material medium to travel
ii) Sound can travel through vacuum
iii) Sound travels as compressions and rarefactions
iv) In sound propagation, particles travel from source to listener
a) i and iii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: a) i and iii
Q33. Which of the following are characteristics of a sound wave?
i) Frequency
ii) Amplitude
iii) Speed
iv) Density
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q34. Which statements about pitch are correct?
i) Pitch depends on frequency
ii) High frequency means high pitch
iii) Pitch depends on amplitude
iv) Faster vibration produces higher pitch
a) i and ii
b) i, ii and iv
c) ii and iii
d) i, ii, iii and iv
Answer: b) i, ii and iv
Q35. Which statements about loudness are correct?
i) Loudness depends on amplitude
ii) Greater force produces louder sound
iii) Loudness depends on frequency
iv) Larger amplitude means louder sound
a) i and ii
b) i, ii and iv
c) ii and iii
d) i, ii, iii and iv
Answer: b) i, ii and iv
Q36. Which of the following statements about speed of sound are correct?
i) Speed of sound depends on the medium
ii) Speed of sound increases with increase in temperature
iii) Speed of sound is same in all media
iv) Sound travels faster in solids than in gases
a) i and ii
b) i, ii and iv
c) ii and iii
d) i, ii, iii and iv
Answer: b) i, ii and iv
Q37. Which of the following are applications of ultrasound?
i) Detecting cracks in metal blocks
ii) Ultrasonography
iii) Measuring depth of sea using SONAR
iv) Producing light
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q38. Which of the following statements about echo are correct?
i) Echo is due to reflection of sound
ii) Time interval for distinct echo must be at least 0.1 s
iii) Echo can be heard even if reflecting surface is very near
iv) Echo depends on speed of sound
a) i and ii
b) i, ii and iv
c) ii and iii
d) i, ii, iii and iv
Answer: b) i, ii and iv
Q39. Which of the following statements about human ear are correct?
i) Pinna collects sound
ii) Ear drum vibrates due to sound
iii) Cochlea converts vibrations into electrical signals
iv) Auditory nerve carries signals to brain
a) i and ii
b) i, ii and iii
c) ii and iii
d) i, ii, iii and iv
Answer: d) i, ii, iii and iv
Q40. Which of the following statements about frequency and time period are correct?
i) Frequency is number of oscillations per second
ii) Time period is time for one oscillation
iii) ν = 1/T
iv) Frequency and time period are directly proportional
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q41. Match the following:
| Column I | Column II |
|---|---|
| a) Compression | i) Low pressure region |
| b) Rarefaction | ii) High pressure region |
| c) Wavelength | iii) Distance between two compressions |
| d) Frequency | iv) Number of oscillations per second |
a) a–ii, b–i, c–iii, d–iv
b) a–i, b–ii, c–iii, d–iv
c) a–ii, b–iii, c–i, d–iv
d) a–ii, b–i, c–iv, d–iii
Answer: a) a–ii, b–i, c–iii, d–iv
Q42. Match the following:
| Column I | Column II |
|---|---|
| a) Pitch | i) Amplitude |
| b) Loudness | ii) Frequency |
| c) Time period | iii) 1/ν |
| d) Speed | iv) λν |
a) a–ii, b–i, c–iii, d–iv
b) a–i, b–ii, c–iii, d–iv
c) a–ii, b–iii, c–i, d–iv
d) a–iv, b–i, c–ii, d–iii
Answer: a) a–ii, b–i, c–iii, d–iv
Q43. Match the following:
| Column I | Column II |
|---|---|
| a) Infrasound | i) Above 20 kHz |
| b) Ultrasound | ii) Below 20 Hz |
| c) Audible sound | iii) 20 Hz to 20 kHz |
| d) SONAR | iv) Echo ranging |
a) a–ii, b–i, c–iii, d–iv
b) a–i, b–ii, c–iii, d–iv
c) a–ii, b–iii, c–i, d–iv
d) a–iii, b–ii, c–i, d–iv
Answer: a) a–ii, b–i, c–iii, d–iv
Q44. Match the following:
| Column I | Column II |
|---|---|
| a) Pinna | i) Converts sound to electrical signals |
| b) Ear drum | ii) Collects sound |
| c) Cochlea | iii) Vibrates |
| d) Auditory nerve | iv) Carries signals to brain |
a) a–ii, b–iii, c–i, d–iv
b) a–iii, b–ii, c–i, d–iv
c) a–ii, b–i, c–iii, d–iv
d) a–ii, b–iii, c–iv, d–i
Answer: a) a–ii, b–iii, c–i, d–iv
Q45. Match the following:
| Column I | Column II |
|---|---|
| a) Echo | i) Repeated reflection |
| b) Reverberation | ii) Single reflection |
| c) Megaphone | iii) Directs sound |
| d) Stethoscope | iv) Multiple reflection in body |
a) a–ii, b–i, c–iii, d–iv
b) a–i, b–ii, c–iii, d–iv
c) a–ii, b–iii, c–i, d–iv
d) a–iii, b–i, c–ii, d–iv
Answer: a) a–ii, b–i, c–iii, d–iv
Q46. Match the following:
| Column I | Column II |
|---|---|
| a) Aluminium | i) 346 m/s |
| b) Air | ii) 6420 m/s |
| c) Hydrogen | iii) 1284 m/s |
| d) Water (sea) | iv) 1531 m/s |
a) a–ii, b–i, c–iii, d–iv
b) a–i, b–ii, c–iii, d–iv
c) a–iii, b–iv, c–i, d–ii
d) a–ii, b–iii, c–i, d–iv
Answer: a) a–ii, b–i, c–iii, d–iv
Q47. Match the following:
| Column I | Column II |
|---|---|
| a) Amplitude | i) Loudness |
| b) Frequency | ii) Pitch |
| c) Time period | iii) One oscillation time |
| d) Intensity | iv) Sound energy per unit area per second |
a) a–i, b–ii, c–iii, d–iv
b) a–ii, b–i, c–iii, d–iv
c) a–iii, b–iv, c–i, d–ii
d) a–iv, b–ii, c–iii, d–i
Answer: a) a–i, b–ii, c–iii, d–iv
Q48. Match the following:
| Column I | Column II |
|---|---|
| a) Bat | i) Infrasound |
| b) Elephant | ii) Ultrasound |
| c) Whale | iii) Infrasound |
| d) Dolphin | iv) Ultrasound |
a) a–ii, b–i, c–iii, d–iv
b) a–i, b–ii, c–iii, d–iv
c) a–ii, b–iii, c–i, d–iv
d) a–iii, b–i, c–ii, d–iv
Answer: a) a–ii, b–i, c–iii, d–iv
Q49. Match the following:
| Column I | Column II |
|---|---|
| a) Echocardiography | i) Kidney stones |
| b) Ultrasonography | ii) Heart imaging |
| c) Ultrasound cleaning | iii) Internal organ imaging |
| d) Breaking stones | iv) Cleaning hard parts |
a) a–ii, b–iii, c–iv, d–i
b) a–iii, b–ii, c–iv, d–i
c) a–ii, b–iv, c–i, d–iii
d) a–i, b–ii, c–iii, d–iv
Answer: a) a–ii, b–iii, c–iv, d–i
Q50. Match the following:
| Column I | Column II |
|---|---|
| a) Crest | i) Lower portion of wave |
| b) Trough | ii) Upper portion of wave |
| c) Supersonic | iii) Speed greater than sound |
| d) Sonic boom | iv) Loud sound due to shock waves |
a) a–ii, b–i, c–iii, d–iv
b) a–i, b–ii, c–iii, d–iv
c) a–ii, b–iii, c–i, d–iv
d) a–iii, b–iv, c–i, d–ii
Answer: a) a–ii, b–i, c–iii, d–iv
SEBA Class 9 Science Chapter 12 Sound MCQs (2026–27) Important Objective Questions
The SEBA Class 9 Science Chapter 12 Sound MCQs are prepared strictly as per the latest ASSEB syllabus 2026–27. These SEBA Class 9 Science Chapter 12 Sound MCQs include conceptual objective questions, numerical MCQs, and board-oriented practice sets.
Students preparing for the board examination should regularly practice SEBA Class 9 Science Chapter 12 Sound MCQs. These seba class 9 science chapter 12 mcqs cover important topics such as characteristics of sound waves, frequency, wavelength, time period, amplitude, speed of sound in different media, and reflection of sound.
The sound mcqs class 9 seba provided here are prepared by subject experts to ensure alignment with the latest board exam pattern. These ASSEB class 9 science important MCQs help students understand numerical problem-solving, echo conditions, and ultrasound applications clearly.
Regular revision of SEBA Class 9 Science Chapter 12 Sound MCQs along with assam board class 9 science objective questions improves conceptual clarity, numerical accuracy, and board exam performance in the 2026–27 ASSEB examination.
Frequently Asked Questions (FAQ)
1. Are these SEBA Class 9 Science Chapter 12 Sound MCQs based on the latest syllabus?
Yes, these SEBA Class 9 Science Chapter 12 Sound MCQs follow the latest ASSEB syllabus for 2026–27.
2. Are these seba class 9 science chapter 12 mcqs helpful for board exam preparation?
Yes, these seba class 9 science chapter 12 mcqs are designed according to the latest board exam pattern.
3. Do sound mcqs class 9 seba include numerical problems?
Yes, sound mcqs class 9 seba include numerical and conceptual application questions.
4. Who prepared these ASSEB class 9 science important MCQs?
These ASSEB class 9 science important MCQs are prepared by subject experts of Assam Eduverse.
5. Are assam board class 9 science objective questions from Sound frequently asked?
Yes, important assam board class 9 science objective questions from Sound are frequently asked in examinations.
6. Which important topics are covered in Chapter 12 MCQs?
Topics include characteristics of sound waves, speed of sound, echo, reflection of sound, and ultrasound applications.
7. Can regular practice of SEBA Class 9 Science Chapter 12 Sound MCQs improve scores?
Yes, regular practice improves numerical accuracy, conceptual clarity, and board exam performance.
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