Sound Practice Questions

Class 9 · Science · 2983 free MCQs with instant results and detailed explanations.

2983

Total

1071

Easy

1394

Medium

518

Hard

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Topics in Sound

SONAR 373

Propagation 606

Production of Sound 609

Characteristics of Sound 626

Human Ear 244

Echo 525

Sample Questions from Sound

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Easy

What is the primary source of sound production in humans?

A. Vocal cords

B. Lungs

C. Heart

D. Skin

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Correct Answer: A

Humans produce sound primarily through their vocal cords, which vibrate when air is pushed from the lungs.

Easy

Which of the following correctly describes how sound travels?

A. Through vacuum

B. Through solid, liquid, and gas

C. Only through gas

D. Only through liquid

Show Answer & Explanation

Correct Answer: B

Sound requires a medium to travel, and it can move through solids, liquids, and gases but not through a vacuum.

Easy

What is the process of creating sound called?

A. Vibration

B. Reflection

C. Refraction

D. Absorption

Show Answer & Explanation

Correct Answer: A

Sound is produced by the vibration of objects, which creates pressure waves in the surrounding medium.

Medium

Which of the following describes the source of sound in a guitar?

A. Strings vibrating

B. Body of the guitar

C. Air inside the guitar

D. Pick used to strum

Show Answer & Explanation

Correct Answer: A

The sound in a guitar is primarily produced by the vibration of its strings when plucked or strummed.

Medium

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

A. It decreases

B. It stays the same

C. It increases

D. It becomes inaudible

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Correct Answer: C

Pitch is directly related to frequency; as frequency increases, the pitch of the sound also increases.

Medium

What determines the loudness of a sound?

A. Wavelength

B. Amplitude

C. Frequency

D. Speed

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Correct Answer: B

Loudness is determined by the amplitude of the sound wave; higher amplitude results in louder sounds.

Medium

Which of the following does NOT affect the speed of sound in air?

A. Temperature

B. Humidity

C. Altitude

D. Color of the sound source

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Correct Answer: D

The speed of sound is influenced by physical conditions like temperature, humidity, and altitude, but not the color of the sound source.

Hard

Which of the following statements about sound waves is incorrect?

A. Sound can travel through solids, liquids, and gases.

B. Sound waves are longitudinal waves.

C. Sound does not require a medium to travel.

D. The frequency of sound determines its pitch.

Show Answer & Explanation

Correct Answer: C

Sound requires a medium (solid, liquid, or gas) to propagate; it cannot travel through a vacuum.

Hard

What is the relationship between frequency and wavelength in sound waves?

A. Frequency is directly proportional to wavelength.

B. Wavelength increases as frequency decreases.

C. Frequency does not affect wavelength.

D. Wavelength decreases as frequency decreases.

Show Answer & Explanation

Correct Answer: B

Frequency and wavelength are inversely related; as frequency increases, wavelength decreases.

Q10

Hard

Which instrument demonstrates the production of sound by vibrating air columns?

A. Violin

B. Flute

C. Drum

D. Piano

Show Answer & Explanation

Correct Answer: B

A flute produces sound by vibrating air columns when blown across an opening.

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Sound — Class 9 Science Practice Questions Online

This page contains 2983 practice MCQs for the chapter Sound in Class 9 Science. The questions are organized by difficulty — 1071 easy, 1394 medium, 518 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 6 topics, giving you comprehensive coverage of the entire chapter.