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CBSE Class 8 Science Chapter 10 Sound Worksheet with Answers

Sound is a fundamental chapter in CBSE Class 8 Science, introducing students to wave motion, vibration, and auditory phenomena. This printable worksheet consolidates all key concepts from NCERT Chapter 10, offering a balanced mix of objective, short-answer, and analytical questions. Designed for 60 minutes of focused practice, it mirrors the actual board exam pattern and helps students identify knowledge gaps early. Print, solve, and check against the detailed answer key provided at the end.

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Key takeaways

  • ✓Worksheet covers production and propagation of sound, frequency, amplitude, pitch, and noise pollution as per NCERT Class 8 Science Chapter 10.
  • ✓Section-wise question pattern includes 6 MCQs, 5 fill-in-the-blanks, true/false, 5 short-answer, and 3 long-answer HOTS questions.
  • ✓One case-study question tests application of sound concepts in real-world scenarios like ultrasound imaging and sonar.
  • ✓Complete answer key with brief explanations for every question enables self-study and conceptual clarity.
  • ✓Difficulty level is Medium; suggested completion time is 60 minutes for effective revision before tests.
  • ✓Questions align with CBSE Class 8 Science solutions and typical board exam patterns for thorough preparation.
  • ✓Students struggling with any concept can upload their worksheet to CBSETUTOR.ai for instant AI-powered explanations at ₹999/month with a 3-day free trial.

Quick Chapter Recap: Sound

Before attempting this worksheet, revisit the core ideas from NCERT Class 8 Science Chapter 10. Sound is produced by vibrating objects; these vibrations travel as longitudinal waves through a medium such as air, water, or solids. The human ear detects frequencies between 20 Hz and 20,000 Hz; sounds below 20 Hz are infrasonic, and those above 20,000 Hz are ultrasonic. Frequency determines pitch—higher frequency means shriller sound—while amplitude governs loudness. The speed of sound varies with medium and temperature; it travels fastest in solids, slower in liquids, and slowest in gases. Noise pollution arises from excessive or unwanted sound and poses health risks such as hearing loss, hypertension, and sleep disturbance. Musical instruments produce pleasant, regular vibrations, whereas noise consists of irregular, jarring vibrations. Understanding these principles lays the foundation for solving every question in this worksheet accurately.
  • Sound requires a medium; it cannot propagate in vacuum.
  • Frequency (measured in Hertz) determines pitch; amplitude determines loudness.
  • Human audible range: 20 Hz to 20,000 Hz; dogs and bats hear ultrasonic frequencies.
  • Speed of sound in air at 25°C is approximately 346 m/s.
  • Noise pollution sources include traffic, loudspeakers, and industrial machinery.
  • Musical sounds have regular waveforms; noise has irregular, chaotic waveforms.

Section A: Multiple Choice Questions (MCQs)

Multiple-choice questions test your recall and conceptual understanding of NCERT Class 8 Science Chapter 10. Each MCQ has four options; select the one that best answers the question. These questions cover sound production, properties of waves, audible and inaudible frequencies, and noise pollution. Pay close attention to units (Hertz for frequency, decibels for loudness) and the difference between pitch and loudness. This section forms the backbone of objective-type assessments in CBSE exams. Attempt all six questions carefully, marking your answers on a separate sheet, then cross-check with the answer key provided at the end of this worksheet. Remember that negative marking is not applicable here, so educated guessing is acceptable when unsure. Keep track of time—aim to finish this section in about 10 minutes to leave ample room for descriptive questions later.
  • Question 1: Sound is produced by (a) stationary objects (b) vibrating objects (c) transparent objects (d) heavy objects
  • Question 2: The frequency of audible sound for humans ranges from (a) 2 Hz to 2,000 Hz (b) 20 Hz to 20,000 Hz (c) 200 Hz to 200,000 Hz (d) 2,000 Hz to 200,000 Hz
  • Question 3: Which of the following is an example of infrasonic sound? (a) Dog whistle (b) Earthquake waves (c) Human voice (d) Ultrasound scan
  • Question 4: Pitch of sound depends on (a) amplitude (b) frequency (c) speed (d) medium
  • Question 5: Sound travels fastest in (a) air (b) water (c) steel (d) vacuum
  • Question 6: The unit of frequency is (a) Decibel (b) Metre per second (c) Hertz (d) Newton

Section B: Fill in the Blanks

Fill-in-the-blank questions reinforce terminology and numerical facts from Class 8 Science Chapter 10. Write the missing word or phrase on the line provided. These questions target key definitions, units, and phenomena such as amplitude, wavelength, echo, and noise pollution. Precision matters—use exact NCERT terms like 'longitudinal wave' rather than synonyms. This section sharpens your ability to recall specific vocabulary under exam pressure. Blanks may test both qualitative concepts (for example, the type of wave sound is) and quantitative data (such as the speed of sound in air). Allocate roughly 8 minutes to complete all five blanks, leaving time to review your spelling and accuracy. Cross-reference your answers with the NCERT Class 8 Science textbook if you are unsure about terminology. Consistent practice with fill-in-the-blanks builds confidence for board exams where such questions frequently appear in the objective or very-short-answer sections.
  • Question 7: Sound waves are __________ waves. (Answer: longitudinal)
  • Question 8: The loudness of sound is determined by its __________. (Answer: amplitude)
  • Question 9: Sounds above 20,000 Hz are called __________. (Answer: ultrasonic)
  • Question 10: The persistence of sound after the source stops is called __________. (Answer: echo / reverberation)
  • Question 11: Noise pollution can cause __________ and stress in humans. (Answer: hearing loss / hypertension / sleep disturbance)

Section C: True or False with Correction

In this section, read each statement carefully and decide whether it is true or false. If the statement is false, rewrite it to make it correct. True-or-false questions test your ability to detect subtle errors in wording—common pitfalls include confusing pitch with loudness, frequency with wavelength, or audible with ultrasonic ranges. Writing the correction reinforces the accurate concept in your memory. This format mirrors CBSE Class 8 Science solutions where justification is as important as the binary answer. Allocate about 10 minutes for this section, ensuring you provide a complete corrected sentence for every false statement. Use NCERT terminology precisely; for example, if a statement incorrectly says sound travels fastest in gases, your correction should specify that sound travels fastest in solids due to tightly packed particles. This section builds critical reading skills essential for board exams and competitive assessments alike.
  • Question 12: Sound can travel through vacuum. (False. Correction: Sound requires a material medium to travel and cannot propagate in vacuum.)
  • Question 13: Higher frequency results in a shriller sound. (True)
  • Question 14: Amplitude determines the pitch of a sound. (False. Correction: Frequency determines pitch; amplitude determines loudness.)
  • Question 15: Bats use infrasonic waves for navigation. (False. Correction: Bats use ultrasonic waves for echolocation and navigation.)
  • Question 16: The speed of sound increases with temperature. (True)

Section D: Short Answer Questions (2–3 Marks Each)

Short-answer questions demand concise explanations, typically within 30 to 50 words. CBSE Class 8 Science exams award 2 or 3 marks for such questions, so structure your answer in two to three clear sentences. Begin with a direct statement answering the question, then add one supporting detail or example. For instance, if asked how sound is produced, state that vibrating objects produce sound, then explain that vibrations create compressions and rarefactions in the surrounding medium. Use diagrams where helpful—for example, sketch a simple waveform to show amplitude and wavelength. This section tests both recall and the ability to communicate scientific ideas succinctly. Aim to spend about 15 minutes on these five questions. Review NCERT Class 8 Science notes to ensure you use official definitions and examples. Practicing short answers regularly sharpens exam technique and boosts confidence when facing board papers.
  • Question 17: Explain how sound is produced. Give one example.
  • Question 18: What is the difference between pitch and loudness?
  • Question 19: Why can sound not travel in vacuum?
  • Question 20: Define the audible range of frequencies for humans.
  • Question 21: List two harmful effects of noise pollution.

Section E: Long Answer and HOTS Questions (5 Marks Each)

Long-answer questions carry 5 marks and require detailed, well-organized responses of 80 to 120 words. CBSE examiners look for logical flow, use of scientific terminology, and real-world applications. Start with a definition or principle, explain the underlying mechanism, and conclude with an example or diagram. Higher-order thinking skills (HOTS) questions test your ability to apply sound concepts to novel situations—such as explaining why astronauts cannot communicate by voice on the moon or how ultrasound is used in medical imaging. Allocate 15 to 18 minutes for these three questions. Use bullet sub-points if the question asks for multiple parts. Draw labeled diagrams where relevant, such as a waveform showing amplitude and wavelength, or a schematic of the human ear. Refer to NCERT Class 8 Science solutions for model answers and mark distribution. Mastering long-answer questions is crucial for scoring high in board exams and builds the analytical depth needed for higher classes.
  • Question 22: Describe the mechanism of sound propagation in air. Include the terms compression and rarefaction in your answer.
  • Question 23: Explain how bats use ultrasound for navigation. Why can humans not hear these sounds?
  • Question 24: Discuss three measures to control noise pollution in urban areas.

Section F: Case-Study Question (4 Marks)

Case-study questions present a real-world scenario followed by sub-questions that test comprehension, application, and inference. CBSE has introduced this format to encourage critical thinking and interdisciplinary connections. Read the passage carefully, underline key facts such as frequencies, speeds, or applications, and then answer each sub-question in complete sentences. The case study below integrates sound concepts with medical and marine technology, reflecting how NCERT Class 8 Science Chapter 10 applies beyond the classroom. Allocate 8 to 10 minutes for this question. Answers should be precise; avoid lengthy narratives unless asked to explain. Use units correctly—Hertz for frequency, metres per second for speed—and cite data from the passage where relevant. This question type builds reading comprehension and analytical skills, preparing students for competitive exams and real-life problem-solving. If you find interpretation challenging, platforms like CBSETUTOR.ai can provide instant clarifications by uploading your worksheet photo.

Complete Answer Key with Explanations

The answer key below provides correct responses and brief explanations for every question in this worksheet. Use it to self-assess your understanding after completing the worksheet. For MCQs and fill-in-the-blanks, compare your answers directly. For short and long answers, check whether you covered all key points and used correct terminology. If your answer differs, revisit the relevant section in NCERT Class 8 Science Chapter 10 to understand the concept. Explanations clarify why an answer is correct, reinforcing learning rather than rote memorization. If you score below 70 percent, identify weak topics and practice additional problems from CBSE Class 8 Science solutions or online resources. Regular worksheet practice combined with answer-key review builds exam confidence and ensures thorough preparation. Students seeking personalized feedback can upload their solved worksheets to CBSETUTOR.ai, where an AI tutor provides step-by-step guidance at ₹999 per month across all subjects for Classes 6 to 12, with a 3-day free trial to explore the platform.
  • Answer 1: (b) vibrating objects. Sound is produced only when objects vibrate.
  • Answer 2: (b) 20 Hz to 20,000 Hz. This is the standard audible range for healthy human ears.
  • Answer 3: (b) Earthquake waves. Infrasonic waves have frequencies below 20 Hz.
  • Answer 4: (b) frequency. Pitch is directly proportional to frequency.
  • Answer 5: (c) steel. Sound travels fastest in solids due to closely packed particles.
  • Answer 6: (c) Hertz. Frequency is measured in Hertz (Hz).
  • Answer 7: longitudinal. Sound waves have compressions and rarefactions along the direction of propagation.
  • Answer 8: amplitude. Greater amplitude means louder sound.
  • Answer 9: ultrasonic. Frequencies above 20,000 Hz are ultrasonic.
  • Answer 10: echo (or reverberation). Echo is reflection of sound; reverberation is prolonged reflection.
  • Answer 11: hearing loss (or hypertension/sleep disturbance). Noise pollution affects physical and mental health.
  • Answer 12: False. Correction: Sound requires a material medium and cannot travel in vacuum.
  • Answer 13: True. Higher frequency produces shriller (higher-pitched) sound.
  • Answer 14: False. Correction: Frequency determines pitch; amplitude determines loudness.
  • Answer 15: False. Correction: Bats use ultrasonic waves (above 20,000 Hz) for echolocation.
  • Answer 16: True. Speed of sound increases with temperature because particles move faster.
  • Answer 17: Sound is produced when an object vibrates, creating compressions and rarefactions in the medium. Example: a vibrating tuning fork produces sound in air.
  • Answer 18: Pitch depends on frequency—higher frequency means shriller sound. Loudness depends on amplitude—greater amplitude means louder sound.
  • Answer 19: Sound needs a material medium (solid, liquid, or gas) to propagate. Vacuum has no particles to transmit vibrations, so sound cannot travel.
  • Answer 20: The audible range for humans is 20 Hz to 20,000 Hz. Sounds below or above this range are inaudible to most people.
  • Answer 21: (i) Hearing loss and damage to eardrums. (ii) Increased stress, hypertension, and sleep disturbance.
  • Answer 22: Sound propagates as longitudinal waves. Vibrations create compressions (high-pressure regions) and rarefactions (low-pressure regions) that travel through air. Particles oscillate parallel to wave direction without permanent displacement. Speed in air at 25°C is ~346 m/s. Energy is transferred through the medium until absorbed or dissipated.
  • Answer 23: Bats emit ultrasonic waves (above 20,000 Hz) that reflect off objects. By detecting echoes and measuring time delay, bats determine distance and navigate in darkness. Humans cannot hear ultrasound because our ears detect only 20 Hz to 20,000 Hz; frequencies above this range lie beyond our auditory capability.
  • Answer 24: (i) Planting trees along roadsides absorbs sound. (ii) Using silencers in vehicles and machinery reduces emission. (iii) Enforcing noise limits near schools and hospitals protects sensitive areas. (iv) Promoting public transport reduces traffic noise. (v) Soundproofing buildings with insulating materials minimizes indoor noise.
  • Answer (Case Study i): Ultrasound has higher frequency and shorter wavelength, allowing detailed imaging of soft tissues without harm.
  • Answer (Case Study ii): Distance = (Speed × Time)/2 = (1,500 m/s × 0.4 s)/2 = 300 m. Ocean floor depth is 300 metres.
  • Answer (Case Study iii): Ultrasound imaging is non-invasive and safe for monitoring fetal development without radiation exposure.

How to Use This Worksheet Effectively

Print this worksheet on A4 paper and solve it in one sitting under timed conditions to simulate exam pressure. Allocate 60 minutes total: 10 minutes for MCQs, 8 minutes for fill-in-the-blanks, 10 minutes for true/false, 15 minutes for short answers, 18 minutes for long answers, and the remaining time for the case study. Use a pencil so you can erase and correct mistakes. After completing, check your answers against the key and calculate your percentage. Identify topics where you lost marks—whether production and propagation, frequency and pitch, or noise pollution—and revisit those sections in your NCERT Class 8 Science textbook. Reattempt incorrect questions after revising the concept. For personalized doubt-clearing, upload your worksheet to CBSETUTOR.ai, where an AI tutor offers step-by-step explanations, alternative methods, and instant feedback. The platform covers every CBSE class from 6 to 12 at a flat ₹999 per month, with a 3-day free trial so your child can explore before committing. Regular worksheet practice sharpens time management, reinforces core ideas, and builds the confidence needed to excel in board exams and competitive assessments.
  • Solve under timed conditions to build exam stamina and time management.
  • Use the answer key to self-assess; calculate percentage and identify weak areas.
  • Revisit NCERT Chapter 10 for concepts where you lost marks.
  • Reattempt incorrect questions after revision to reinforce learning.
  • Upload your solved worksheet to CBSETUTOR.ai for AI-powered doubt resolution and personalized feedback.
  • Practice multiple worksheets to cover all question types and difficulty levels.

Additional Practice Resources for Sound

Beyond this worksheet, strengthen your grasp of Class 8 Science Chapter 10 by solving NCERT back-exercises, sample papers, and previous years' board questions. The official NCERT textbook includes in-text questions and end-of-chapter exercises that mirror exam patterns. CBSE sample papers for Class 8 Science often feature MCQs and case studies on sound, providing exposure to the latest question formats. Online platforms such as CBSETUTOR.ai offer unlimited practice worksheets, video explanations, and instant photo-upload doubt solving for ₹999 per month across all subjects and classes 6 to 12, with a 3-day free trial. YouTube channels by experienced educators demonstrate sound experiments—such as visualizing vibrations on a drum membrane with sand—that deepen conceptual understanding. Form study groups with classmates to discuss tricky questions like the difference between echo and reverberation or the inverse relationship between wavelength and frequency. Regular revision, spaced practice, and active recall using flashcards or mind maps ensure long-term retention and confidence heading into exams.
  • Solve all NCERT in-text and end-of-chapter questions for comprehensive coverage.
  • Attempt CBSE sample papers and previous years' questions to familiarize with exam patterns.
  • Watch video experiments demonstrating sound vibrations, echo, and ultrasound applications.
  • Join or form study groups to discuss challenging concepts and share mnemonics.
  • Use CBSETUTOR.ai for unlimited worksheets, instant doubt-solving, and 24×7 AI tutor support at ₹999/month.
  • Create flashcards for key terms like compression, rarefaction, pitch, amplitude, and ultrasonic.

Frequently asked questions

What is the difficulty level and suggested time for this CBSE Class 8 Science Chapter 10 Sound worksheet?+
This worksheet is of Medium difficulty and should be completed in 60 minutes. It includes MCQs, fill-in-the-blanks, true/false, short-answer, long-answer, and one case-study question, mirroring typical CBSE exam patterns for thorough practice.
Does this worksheet cover all topics from NCERT Class 8 Science Chapter 10 Sound?+
Yes, the worksheet comprehensively covers production and propagation of sound, frequency, amplitude, pitch, audible and inaudible ranges, speed of sound in different media, and noise pollution, aligning fully with NCERT curriculum and CBSE guidelines.
Are answers provided for all questions in this Sound worksheet?+
Absolutely. A complete answer key with brief explanations is included at the end. It covers MCQs, fill-in-the-blanks, true/false corrections, and detailed model answers for short, long, and case-study questions to aid self-assessment and learning.
How should my child approach the case-study question on ultrasound and sonar?+
Read the passage carefully, underline key data like frequencies and speeds, then answer each sub-question in complete sentences. Use formulas where required (Distance = Speed × Time / 2). Refer to the answer key for model responses and clarification.
Can I print this worksheet for classroom or home use?+
Yes, this worksheet is designed to be printer-friendly. Print on A4 paper, solve under timed conditions, and check answers using the key provided. It is ideal for self-study, group revision, or quick assessments by teachers.
What if my child struggles with long-answer questions on sound propagation or noise pollution?+
Encourage your child to revisit NCERT Class 8 Science Chapter 10, focusing on definitions and examples. Platforms like CBSETUTOR.ai offer instant AI-tutor explanations via photo upload, helping clarify doubts step-by-step at ₹999/month with a 3-day free trial.
How can I check if my child has understood the difference between pitch and loudness?+
Ask them to explain in their own words: pitch depends on frequency (shriller if higher Hz), while loudness depends on amplitude (louder if greater amplitude). Review their answers to Q18 and Q14 in this worksheet for clarity.
Are MCQs and fill-in-the-blanks enough for board exam preparation in Sound chapter?+
No, board exams also include short-answer, long-answer, and application-based questions. This worksheet balances all formats—MCQs for quick recall, short answers for concept explanation, and long answers plus case studies for HOTS and real-world application.
How often should my child practice such worksheets for Class 8 Science?+
Ideally, solve one chapter-specific worksheet per week after completing the topic in class. Before exams, attempt mixed-topic worksheets and sample papers. Regular practice builds speed, accuracy, and confidence, ensuring strong performance in board assessments.
Where can I find more CBSE Class 8 Science worksheets with answers?+
CBSETUTOR.ai offers unlimited printable worksheets, instant doubt-solving via photo upload, and 24×7 AI tutor access for all CBSE classes 6 to 12 at ₹999/month. Start with a 3-day free trial to explore comprehensive resources across every subject and chapter.

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