Class 8 Science — Chapter 10: Sound
72 practice questions · 24 Easy · 24 Medium · 24 Hard
Practise Class 8 Science Chapter 10, "Sound", with 72 NCERT-aligned multiple-choice questions. The set is split into 24 Easy, 24 Medium and 24 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams.
"Sound" is one of the chapters where concept clarity across physics, chemistry and biology basics really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Sound, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 8 Science mastery score. A few sample questions are shown below; sign in free to practise all 72.
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.
- Noise pollution
- Unwanted, loud sound that harms health; reduced by controlling sources and planting trees.
Key formulas — Sound
💡 Exam tips for Sound
- Sound needs a medium — it cannot travel through vacuum (unlike light).
- Loudness depends on amplitude; pitch depends on frequency — keep the two separate.
Sample questions
A rapid to-and-fro motion of an object is called:
Vibration is the rapid back-and-forth motion that produces sound.
An electric bell ringing inside a jar becomes fainter as air is pumped out. This shows that:
As air (the medium) is removed, the sound weakens, proving sound needs a medium.
A wave has a time period of 0.005 s. Its frequency is:
f = 1 ÷ T = 1 ÷ 0.005 = 200 Hz.
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, Noise pollution.
What does Class 8 Science Chapter 10 (Sound) cover on XamBaaz?+
It covers 72 NCERT-aligned MCQs on "Sound" — 24 Easy, 24 Medium and 24 Hard — each with a timed quiz and an instant explanation, suitable 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 (limited-time launch price), with no per-chapter charges.
How should I revise "Sound" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
Practise all 72 questions free
Timed quizzes, instant scoring, streaks and XP. Sign in with Google — no card needed.
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