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CBSE Class 9  >  Class 9 Notes  >  Science   >  Unit Test: Sound

Unit Test: Sound

Time: 1 hour 
M.M. 30 
Attempt all questions. 
Question numbers 1 to 5 carry 1 mark each. 
Question numbers 6 to 8 carry 2 marks each. 
Question numbers 9 to 11 carry 3 marks each. 
Question numbers 12 & 13 carry 5 marks each.

​Q1. What is the SI unit of frequency? (1 Mark)

​Q2. Define the term "wavelength." (1 Mark)

Q3. Which type of wave is sound? (1 Mark)
(i) Transverse
(ii) Longitudinal
(iii) Electromagnetic
(iv) Stationary

​Q4. Fill in the blank: Sound travels fastest in _________. (1 Mark)

Q5. Which of the following is an application of ultrasound? (1 Mark)
(i) Measuring temperature
(ii) Detecting flaws in metal blocks
(iii) Generating visible light
(iv) Producing low-frequency sound

​Q6. Why are sound waves called mechanical waves? (2 Marks)

​Q7. How is an echo produced? (2 Marks)

​Q8. What is the difference between a tone and a note? (2 Marks)

​Q9. Explain how sound is produced and propagated through a medium. (3 Marks)

​Q10. Describe how a stethoscope uses multiple reflections of sound to function. (3 Marks)

Q11. Calculate the time taken by a sound wave with a frequency of 2 kHz and a wavelength of 35 cm to travel 1.5 km in air. (3 Marks)

Q12. Establish the relationship between the speed of sound, its wavelength, and frequency. If the velocity of sound in air is 340 m s-1, calculate
  (i) wavelength when frequency is 256 Hz.  
(ii) frequency when wavelength is 0.85 m  (5 Marks)

Q13. Describe the applications of ultrasound in medical and industrial fields with examples. (5 Marks)

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FAQs on Unit Test: Sound

1. What is sound and how is it produced?
Ans.Sound is a form of energy that travels through air, liquids, and solids as a wave. It is produced when an object vibrates, creating pressure waves in the surrounding medium. These vibrations can be caused by various factors, such as the plucking of a guitar string or the striking of a drum.
2. What are the characteristics of sound waves?
Ans.Sound waves have several key characteristics, including frequency, amplitude, wavelength, and speed. Frequency determines the pitch of the sound, amplitude affects the loudness, wavelength is the distance between successive wave crests, and speed refers to how fast the sound wave travels through the medium.
3. How does sound travel through different mediums?
Ans.Sound travels through different mediums at varying speeds. It travels fastest in solids because the particles are closely packed, allowing the vibrations to transfer more quickly. In liquids, sound travels slower than in solids but faster than in gases. In gases, the speed of sound is the slowest due to the large distance between particles.
4. What is the relationship between pitch and frequency?
Ans.Pitch is directly related to the frequency of a sound wave. Higher frequencies result in higher pitches, while lower frequencies produce lower pitches. The human ear can typically hear frequencies ranging from about 20 Hz to 20,000 Hz, with different pitches corresponding to different frequencies within this range.
5. What is the Doppler effect and how does it relate to sound?
Ans.The Doppler effect is the change in frequency or wavelength of a sound wave as observed by someone moving relative to the source of the sound. When the source moves towards an observer, the sound waves are compressed, leading to a higher frequency (or pitch). Conversely, when the source moves away, the waves are stretched, resulting in a lower frequency. This phenomenon is commonly experienced with passing sirens or trains.
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Apr 18, 2026 Last updated
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Document Description: Unit Test: Sound for Class 9 2026 is part of Science Class 9 preparation. The notes and questions for Unit Test: Sound have been prepared according to the Class 9 exam syllabus. Information about Unit Test: Sound covers topics like and Unit Test: Sound Example, for Class 9 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Unit Test: Sound.
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