Sound — Class 8 MCQs with Answers
Class 8 CBSE Science · Chapter 110
Pre-2026 syllabusThis chapter is from the older NCERT book. See the 2026-27 Class 8 Science chapters →
72 practice questions · 24 Easy · 24 Medium · 24 Hard · Updated
Practise the most important Class 8 CBSE Science questions from Chapter 110, "Sound". You get 6 timed quizzes made from 72 NCERT-based MCQs, with answers and explanations. The questions are split into 24 Easy, 24 Medium and 24 Hard. Warm up on the basics, then move on to the exam-level questions that set top scorers in CBSE Board exams apart.
To score well in "Sound", focus on clear concepts in physics, chemistry and biology basics. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This trains you to stay accurate under time pressure, as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Sound, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 8 Science mastery score. 14 sample questions are solved in full below, with the answer and a worked explanation. Sign in free to start practising.
Key concepts: Sound (Class 8 Science)
This chapter covers how sound is produced and travels, its characteristics, the human ear, and noise pollution.
- Production of sound
- Sound is produced by vibrating objects; without vibration there is no sound.
- Propagation of sound
- Sound needs a medium (solid, liquid or gas) to travel; it cannot travel through a vacuum.
- Characteristics of sound
- Amplitude decides loudness; frequency decides pitch (frequency is measured in hertz, Hz).
- Audible range
- Humans hear frequencies from 20 Hz to 20,000 Hz; below is infrasound, above is ultrasound.
Sound — important questions & MCQs with answers (Class 8 Science)
14 solved questions from this chapter's difficulty levels, each with its answer and explanation. The other 58 are timed and scored when you sign in.
- Q1Easy
Sound is produced by objects that are:
A.HotB.ColouredC.Vibrating✓ CorrectD.HeavyAnswer: C. Vibrating
Explanation: Sound is produced by vibrating objects — a rapid to-and-fro motion.
- Q2Easy
Sound needs a ____ to travel.
A.VacuumB.MagnetC.BatteryD.Medium✓ CorrectAnswer: D. Medium
Explanation: Sound requires a material medium (solid, liquid or gas) to travel; it cannot travel through a vacuum.
- Q3Easy
The loudness of a sound depends on its:
A.Amplitude✓ CorrectB.ColourC.SmellD.MassAnswer: A. Amplitude
Explanation: Greater amplitude of vibration means a louder sound.
- Q4Easy
The thin stretched membrane in the ear that vibrates with sound is the:
A.RetinaB.Vocal cordC.Eardrum✓ CorrectD.LarynxAnswer: C. Eardrum
Explanation: The eardrum vibrates when sound falls on it and passes the vibrations inward.
- Q5Easy
Unpleasant sounds that disturb us are called:
A.Noise✓ CorrectB.EchoC.MusicD.VibrationAnswer: A. Noise
Explanation: Unpleasant, unwanted sounds are called noise; pleasant sounds are music.
- Q6Easy
A rapid to-and-fro motion of an object is called:
A.Vibration✓ CorrectB.RotationC.ReflectionD.ConductionAnswer: A. Vibration
Explanation: Vibration is the rapid back-and-forth motion that produces sound.
- Q7Medium
When you touch a ringing bell, it stops sounding. This is because touching it:
A.Heats itB.Stops its vibrations✓ CorrectC.Magnetises itD.Adds amplitudeAnswer: B. Stops its vibrations
Explanation: Touching damps the vibrations; without vibration there is no sound.
- Q8Medium
An electric bell ringing inside a jar becomes fainter as air is pumped out. This shows that:
A.Sound travels faster in vacuumB.Sound needs a medium to travel and cannot travel in a vacuum✓ CorrectC.The bell stops vibratingD.Light is needed for soundAnswer: B. Sound needs a medium to travel and cannot travel in a vacuum
Explanation: As air (the medium) is removed, the sound weakens, proving sound needs a medium.
- Q9Medium
Two sounds have the same loudness but one is more shrill. The shriller sound has:
A.A higher frequency✓ CorrectB.A larger amplitudeC.A lower frequencyD.More massAnswer: A. A higher frequency
Explanation: Pitch (shrillness) depends on frequency, so the shriller sound has a higher frequency.
- Q10Medium
How do we hear a sound made some distance away?
A.The object's light reaches our eyeB.Through magnetismC.The object touches our earD.Vibrations travel through the air to the eardrum, which vibrates and we hear✓ CorrectAnswer: D. Vibrations travel through the air to the eardrum, which vibrates and we hear
Explanation: Sound vibrations travel through air to the eardrum; its vibrations let us hear the sound.
- Q11Medium
Why is long exposure to loud noise harmful?
A.It can cause lack of sleep, stress and even hearing loss✓ CorrectB.It improves hearingC.It cools the bodyD.It has no effectAnswer: A. It can cause lack of sleep, stress and even hearing loss
Explanation: Noise pollution can disturb sleep, raise stress and damage hearing over time.
- Q12Hard
In a flute, the sound is produced by the vibration of:
A.The column of air inside it✓ CorrectB.A stretched membraneC.Stretched stringsD.A metal discAnswer: A. The column of air inside it
Explanation: Blowing across a flute sets the air column inside vibrating, producing the sound.
- Q13Hard
Assertion (A): Sound cannot be heard on the Moon directly. Reason (R): The Moon has no atmosphere, so there is no medium to carry sound. Choose the correct option.
A.Both A and R are true and R explains A✓ CorrectB.A is false, R is trueC.A is true, R is falseD.Both A and R are falseAnswer: A. Both A and R are true and R explains A
Explanation: No air on the Moon means no medium for sound, so it cannot be heard — R explains A.
- Q14Hard
An object completes 1200 vibrations in one minute. Its frequency is:
A.60 HzB.1200 HzC.20 Hz✓ CorrectD.120 HzAnswer: C. 20 Hz
Explanation: Frequency = vibrations ÷ time = 1200 ÷ 60 s = 20 Hz.
Start this chapter free
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This chapter has 72 questions (24 Easy · 24 Medium · 24 Hard), with timed scoring and instant feedback. The rest unlock with the ₹999/year plan.
Start this chapter free →Sound — FAQs
What are the key concepts in Class 8 Science Sound?+
This chapter covers how sound is produced and travels, its characteristics, the human ear, and noise pollution. Key ideas include Production of sound, Propagation of sound, Characteristics of sound, Audible range.
What does Class 8 Science Chapter 110 (Sound) cover on XamBaaz?+
It has 72 NCERT-based MCQs on "Sound": 24 Easy, 24 Medium and 24 Hard. Together they make 6 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE Board exams.
Are these "Sound" questions free to practise?+
Yes. Sign in with Google to practise "Sound" free. Full unlimited access is ₹999/year on a launch offer until 1 December 2026. No chapter is charged separately.
How should I revise "Sound" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 6 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Sound" MCQs available with answers?+
Yes. 14 sample questions are shown here in full, each with the correct option and a step-by-step "Why" explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Sound" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Sound (Class 8 Science)?+
The questions that matter most test Production of sound, Propagation of sound, Characteristics of sound, Audible range. This page shows 14 solved important MCQs with answers and explanations; all 72 questions on the chapter are available as timed quizzes once you sign in.
Is there an online quiz for Sound?+
Yes — Class 8 Science Sound has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.