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Practice Class 8 Science MCQ Questions with Answers based on the latest NCERT syllabus. Learn about sound, vibrations, frequency, Hertz, amplitude, and shrillness with original concept-based explanations, exam-focused notes, and NCERT-aligned content for CBSE and State Board students.
Do You Know
Chapter Information
Subject: Science
Class: 8
Chapter: Sound
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: Latest NCERT Syllabus
Introduction
Sound is a form of energy produced by vibrating objects and travels through a material medium such as air, water, or solids. It plays an important role in communication and everyday life. Understanding concepts like vibrations, frequency, amplitude, and pitch helps students explain how sound is produced, transmitted, and perceived. This practice set provides original, NCERT-aligned explanations to strengthen conceptual understanding and improve exam performance.
What You Will Learn
✔ Production of sound
✔ Medium required for sound propagation
✔ Vibrations and oscillations
✔ Frequency and its SI unit
✔ Shrillness (Pitch) of sound
Why This Topic Is Important?
The chapter Sound introduces the scientific principles behind hearing and communication. Questions from this topic are commonly asked in CBSE, State Board, Olympiad, and scholarship examinations. A clear understanding of these concepts also forms the foundation for higher studies in Physics.
Exam Relevance
These questions are useful for:
✔ CBSE Exams
✔ State Board Exams
✔ School Tests
✔ Unit Tests
✔ Half-Yearly Exams
✔ Annual Exams
✔ Olympiad Preparation
✔ Scholarship Examinations
Q1. Sound cannot travel through?
A) Vacuum
B) Steel
C) Air
D) Water
Answer
Vacuum
Concept
Sound is a mechanical wave and requires a material medium to travel.
Explanation
Sound propagates through the vibration of particles in solids, liquids, and gases. In a vacuum, there are no particles to transfer these vibrations. Therefore, sound cannot travel through a vacuum.
Exam Focus
Remember: Sound travels through solids, liquids, and gases, but not through a vacuum.
Q2. Sound is produced by?
A) Only by humans
B) Non-vibrating bodies
C) Only by machines
D) Vibrating bodies
Answer
Vibrating bodies
Concept
Every sound originates from the vibration of an object.
Explanation
When an object vibrates, it causes the surrounding particles to vibrate, producing sound waves. Examples include a ringing bell, vibrating guitar string, drum membrane, and vocal cords.
Exam Focus
Remember: Vibration is the source of sound.
Q3. The number of oscillations per second is called?
A) Amplitude
B) Frequency
C) Time period
D) Loudness
Answer
Frequency
Concept
Frequency indicates how many complete vibrations occur in one second.
Explanation
If an object completes more oscillations every second, its frequency is higher. Frequency determines the pitch (shrillness) of sound.
Exam Focus
Remember:
Frequency = Number of oscillations per second
Q4. The unit of frequency is?
A) Metre
B) Newton
C) Decibel
D) Hertz
Answer
Hertz
Concept
The SI unit of frequency is Hertz (Hz).
Explanation
One Hertz (1 Hz) means one complete vibration per second.
Exam Focus
Remember:
Frequency → Hertz (Hz)
Q5. Shrillness of a sound is determined by its?
A) Frequency
B) Distance
C) Amplitude
D) Velocity
Answer
Frequency
Concept
Shrillness, also known as pitch, depends on frequency.
Explanation
A sound with higher frequency has a higher pitch (more shrill), while a sound with lower frequency has a lower pitch (deeper sound).
Exam Focus
Remember:
- High Frequency → High Pitch (Shrill)
- Low Frequency → Low Pitch (Deep)
Important Concepts
1. Sound
- Sound is a form of energy.
- Produced by vibrating objects.
- Travels in the form of mechanical waves.
2. Medium of Sound
Sound can travel through:
- Solids
- Liquids
- Gases
Sound cannot travel through a vacuum.
3. Frequency
Definition:
The number of complete oscillations made in one second.
SI Unit:
Hertz (Hz)
4. Amplitude
Amplitude is the maximum displacement of a vibrating particle from its mean position.
It determines the loudness of sound.
- Greater amplitude → Louder sound
- Smaller amplitude → Softer sound
5. Pitch (Shrillness)
Pitch depends on frequency.
- Higher frequency → Higher pitch
- Lower frequency → Lower pitch
6. Time Period
Time taken to complete one oscillation.
Relationship:
$$[\text{Frequency}=\frac{1}{\text{Time Period}}]$$
Related Practice Questions
- Why cannot sound travel in space?
- Define frequency and write its SI unit.
- What is the difference between loudness and pitch?
- Which property determines the shrillness of sound?
- Give three examples of vibrating objects that produce sound.
Mini Quiz Challenge
True or False
- Sound can travel through a vacuum.
- Vibrating objects produce sound.
- Frequency is measured in Hertz.
- Pitch depends on frequency.
- Amplitude determines loudness.
Exam Tips
✔ Remember that sound requires a material medium.
✔ Do not confuse frequency with amplitude.
✔ Frequency determines pitch, while amplitude determines loudness.
✔ Learn the SI unit of frequency carefully.
✔ Revise the relationship between frequency and time period.
Quick Revision Notes
✔ Sound is produced by vibrating bodies.
✔ Sound cannot travel through a vacuum.
✔ Frequency is the number of oscillations per second.
✔ SI unit of frequency is Hertz (Hz).
✔ Pitch depends on frequency.
✔ Loudness depends on amplitude.
Common Mistakes Students Make
❌ Thinking sound can travel in space.
❌ Confusing amplitude with frequency.
❌ Writing Decibel as the unit of frequency instead of Hertz.
❌ Assuming loudness and pitch are the same.
❌ Forgetting that vibration is necessary for sound production.
Key Takeaways
- Sound is produced by vibrating objects.
- A material medium is necessary for sound to travel.
- Frequency is the number of oscillations completed in one second.
- Hertz (Hz) is the SI unit of frequency.
- Pitch (shrillness) depends on frequency, whereas loudness depends on amplitude.
Conclusion
The chapter Sound explains how vibrations produce sound and how it travels through different media. Understanding concepts such as frequency, amplitude, pitch, and the propagation of sound helps students build a strong foundation in Physics. Regular MCQ practice improves conceptual clarity and prepares students for school examinations and competitive tests.
FAQs
1. Can sound travel through a vacuum?
No. Sound requires a material medium and cannot travel through a vacuum.
2. What produces sound?
Sound is produced by vibrating bodies.
3. What is frequency?
Frequency is the number of complete oscillations made in one second.
4. What is the SI unit of frequency?
The SI unit of frequency is Hertz (Hz).
5. What determines the shrillness (pitch) of sound?
The shrillness or pitch of sound is determined by its frequency.
NCERT Reference
Book: NCERT Science Class 8
Chapter: Chapter 13 – Sound
Based On: Latest NCERT Curriculum (CBSE)
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