Chapter Exam

Chapter-11 Sound — Online MCQ Test

Q: What is sound?

Answer: A. A form of energy produced by vibrating bodies — Sound is produced when an object vibrates and creates energy that travels through a medium. It is not matter or a chemical change.

Q: Which of the following is the unit of frequency?

Answer: B. Hertz — Frequency is measured in hertz (Hz). One hertz means one vibration per second.

Q: A tuning fork produces sound when it is struck because it:

Answer: B. Starts vibrating — Sound is produced by vibrating bodies. When a tuning fork vibrates, it sets the surrounding air into vibration.

Q: A man hears a sound of 200 Hz and another of 2000 Hz. Which statement is correct?

Answer: B. 2000 Hz sound has higher pitch — Higher frequency means higher pitch. Therefore, 2000 Hz sound will have a higher pitch than 200 Hz sound.

Q: Which of the following pairs is correctly matched?

Answer: C. High amplitude — loud sound — Loudness increases with amplitude, so high amplitude means a louder sound. The other options give incorrect relations between sound properties.

SCIENCE · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-11 Sound with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE. This chapter covers: Description Explains the nature of sound vibration frequency pitch and applications Keywords Sound Vibration Frequency Pitch Waves. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-11 Sound — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE — Chapter-11 Sound, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is sound?

A. A form of energy produced by vibrating bodies ✓
B. A form of matter produced by heat
C. A magnetic effect produced by light
D. A chemical change in air

Answer: A. A form of energy produced by vibrating bodies
Sound is produced when an object vibrates and creates energy that travels through a medium. It is not matter or a chemical change.

Which of the following is the unit of frequency?

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

Answer: B. Hertz
Frequency is measured in hertz (Hz). One hertz means one vibration per second.

A tuning fork produces sound when it is struck because it:

A. Becomes heated
B. Starts vibrating ✓
C. Changes into a magnet
D. Reflects light

Answer: B. Starts vibrating
Sound is produced by vibrating bodies. When a tuning fork vibrates, it sets the surrounding air into vibration.

A man hears a sound of 200 Hz and another of 2000 Hz. Which statement is correct?

A. 200 Hz sound has higher pitch
B. 2000 Hz sound has higher pitch ✓
C. Both have same pitch
D. Pitch does not depend on frequency

Answer: B. 2000 Hz sound has higher pitch
Higher frequency means higher pitch. Therefore, 2000 Hz sound will have a higher pitch than 200 Hz sound.

Which of the following pairs is correctly matched?

A. High frequency — low pitch
B. Low frequency — high pitch
C. High amplitude — loud sound ✓
D. Low amplitude — louder sound

Answer: C. High amplitude — loud sound
Loudness increases with amplitude, so high amplitude means a louder sound. The other options give incorrect relations between sound properties.

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