Chapter Exam

Chapter-6 Sound — Online MCQ Test

Q: What is sound produced by?

Answer: A. Vibrating objects — Sound is produced when an object vibrates. These vibrations create sound waves that travel through a medium.

Q: The unit used to measure frequency of sound is:

Answer: B. Hertz — Frequency is measured in hertz (Hz). It tells us how many vibrations occur in one second.

Q: If the frequency of a sound increases, what happens to its pitch?

Answer: B. It increases — Pitch and frequency are directly related. A higher frequency means a higher pitch.

Q: Two tuning forks produce sounds of 300 Hz and 600 Hz. Which statement is correct?

Answer: C. 600 Hz has higher pitch than 300 Hz — Higher frequency sound has higher pitch. Therefore, 600 Hz has a higher pitch than 300 Hz.

Q: A tuning fork makes 512 vibrations in 1 second. Which statement is correct?

Answer: A. Its frequency is 512 Hz and pitch is high — Frequency is measured in hertz, so 512 vibrations per second means 512 Hz. A higher frequency corresponds to a higher pitch.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-6 Sound with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: vibration frequency pitch Covers the nature of sound vibration pitch frequency and its applications. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-6 Sound — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-6 Sound, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is sound produced by?

A. Vibrating objects ✓
B. Moving shadows
C. Stationary objects
D. Cold air

Answer: A. Vibrating objects
Sound is produced when an object vibrates. These vibrations create sound waves that travel through a medium.

The unit used to measure frequency of sound is:

A. Decibel
B. Hertz ✓
C. Metre
D. Newton

Answer: B. Hertz
Frequency is measured in hertz (Hz). It tells us how many vibrations occur in one second.

If the frequency of a sound increases, what happens to its pitch?

A. It decreases
B. It increases ✓
C. It becomes silent
D. It remains unchanged

Answer: B. It increases
Pitch and frequency are directly related. A higher frequency means a higher pitch.

Two tuning forks produce sounds of 300 Hz and 600 Hz. Which statement is correct?

A. Both have the same pitch
B. 300 Hz has higher pitch than 600 Hz
C. 600 Hz has higher pitch than 300 Hz ✓
D. Pitch cannot be compared by frequency

Answer: C. 600 Hz has higher pitch than 300 Hz
Higher frequency sound has higher pitch. Therefore, 600 Hz has a higher pitch than 300 Hz.

A tuning fork makes 512 vibrations in 1 second. Which statement is correct?

A. Its frequency is 512 Hz and pitch is high ✓
B. Its frequency is 512 decibel and pitch is low
C. Its frequency is 512 m and pitch is medium
D. Its frequency is 512 N and sound cannot be heard

Answer: A. Its frequency is 512 Hz and pitch is high
Frequency is measured in hertz, so 512 vibrations per second means 512 Hz. A higher frequency corresponds to a higher pitch.

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