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Sound

Uttar Pradesh Board · Class 9 · Science

Practice quiz for Sound — Uttar Pradesh Board Class 9 Science. MCQs and questions with answers to test your preparation.

29 questions25 flashcards5 concepts

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An illustration showing a tuning fork vibrating. One prong is touching a suspended table tennis ball, causing it to move, demonstrating that vibration produces sound.
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Quick Quiz: Sound

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1

What is the primary cause of sound production?

2

The SI unit of frequency is:

3

What is the minimum distance required to hear a distinct echo if the speed of sound is 344 m/s?

4

The audible range for average human beings is:

29 Questions·
multiple choicemultiple correcttrue false

Sample Questions

1multiple correct

Which of the following are examples of longitudinal waves?

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Sound waves in air, Sound waves in water, Sound waves in solids

Sound waves are longitudinal waves where particles oscillate parallel to the direction of wave propagation. This occurs in all media - solids, liquids, and gases. Light waves and surface water waves are transverse waves.

2true false

Sound cannot travel through vacuum.

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True

Sound requires a medium (solid, liquid, or gas) to travel. It cannot propagate through vacuum because there are no particles to carry the vibrations. This is why there is no sound in space.

3multiple correct

Which factors affect the speed of sound?

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Nature of the medium, Temperature of the medium, Density of the medium

Speed of sound depends on the nature, temperature, and density of the medium. It travels fastest in solids, slower in liquids, and slowest in gases. Higher temperature increases speed. Frequency and amplitude do not affect the speed of sound.

4multiple choice

Compressions in a sound wave are regions of:

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High pressure and high density

Compressions are regions where particles are crowded together, resulting in high pressure and high density. Rarefactions are regions of low pressure and low density where particles are spread apart.

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Frequently Asked Questions

What are the important topics in Sound for Uttar Pradesh Board Class 9 Science?
Sound covers several key topics that are frequently asked in Uttar Pradesh Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Sound — Uttar Pradesh Board Class 9 Science?
Understand the core concepts first, then work through the 29 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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