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Sound (8 Science)

Understand the properties of sound, how it travels, and why it matters. Learn about frequency, wavelength, and practical applications of sound.

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TL;DR: Understand the properties of sound, how it travels, and why it matters. Learn about frequency, wavelength, and practical applications of sound.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 23, 2026

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Understand the properties of sound, how it travels, and why it matters. Learn about frequency, wavelength, and practical applications of sound.

Sound MCQs with Answers & Explanations

Q1. What is sound?

  1. Light waves
  2. Mechanical waves that require a medium ✓ (correct)
  3. Electromagnetic radiation
  4. Movement of particles

Q2. Can sound travel in a vacuum?

  1. Yes
  2. No ✓ (correct)
  3. Only at high speed
  4. Only at low speed

Q3. What is the speed of sound in air at room temperature?

  1. 300,000 km/s
  2. 340 m/s ✓ (correct)
  3. 1000 km/h
  4. 100 m/s

Q4. What is frequency in sound waves?

  1. Distance between waves
  2. Number of vibrations per second ✓ (correct)
  3. Speed of sound
  4. Loudness of sound

Q5. What is wavelength?

  1. Time taken for one vibration
  2. Frequency of the wave
  3. Distance between two consecutive crests or troughs ✓ (correct)
  4. Speed of the wave

Q6. How is pitch related to frequency?

  1. Pitch decreases with frequency
  2. Pitch increases with frequency ✓ (correct)
  3. No relationship
  4. Pitch is independent of frequency

Q7. What is loudness related to?

  1. Frequency
  2. Wavelength
  3. Amplitude of the wave ✓ (correct)
  4. Speed of sound

Q8. What is echo?

  1. Duplication of sound
  2. Reflection of sound from a surface ✓ (correct)
  3. Repetition of a word
  4. High-pitched sound

Q9. What is the range of human hearing?

  1. 0-10 Hz
  2. 10-20,000 Hz
  3. 20-20,000 Hz ✓ (correct)
  4. 100-50,000 Hz

Q10. What is the relationship between speed, frequency, and wavelength?

  1. Speed = frequency x wavelength ✓ (correct)
  2. Speed = frequency / wavelength
  3. Speed = frequency + wavelength
  4. Speed = frequency - wavelength

Frequently Asked Questions

Why does sound travel faster in water than in air?

Water molecules are closer together and more densely packed than air molecules. This allows vibrations to transfer more efficiently, making sound travel faster in water (~1500 m/s) than in air (~340 m/s).

What are some uses of sound waves beyond hearing?

Ultrasonic waves are used in medical ultrasound, sonar for navigation, and cleaning. Infrasonic waves occur in nature through earthquakes and elephant communication.

More 8 Science MCQs

  • Light Reflection and Refraction
  • Electricity
  • Acids Bases and Salts
  • Life Processes
  • Carbon and its Compounds
  • Metals and Non-metals

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