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Sound and Communication

NIOS · Class 10 · Science & Tech

Flashcards for Sound and Communication — NIOS Class 10 Science & Tech. Quick Q&A cards covering key concepts, definitions, and formulas.

43 questions42 flashcards5 concepts

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An illustration of an experiment demonstrating that sound is produced by vibrations, using a bent metallic hanger (bow) and a stretched elastic string. Shows the string vibrating when plucked and a sm
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42 Flashcards
Card 1Sound and vibration

Why do we hear sound only when an object vibrates?

Answer

Sound is a result of vibration. A vibrating source sets the surrounding medium into motion, and the disturbance reaches the ear as a wave. When the vibration stops, the sound also stops.

Card 2Medium for sound

Why can sound not travel on the Moon?

Answer

Sound needs a medium for travel, but the Moon has no usable air. Since sound is a mechanical wave, it cannot move without particles to carry the disturbance.

Card 3Speed of light and sound

Why do we see lightning before hearing thunder?

Answer

Light travels much faster than sound. Speed of sound in air is 330 m/s, while speed of light in free space is about 2.997925×10^8 m/s. So light reaches first and sound comes later.

Card 4Wave calculation

A sound wave travels at 330 m/s and has frequency 1000 Hz. What is its wavelength?

Answer

Use V = n × λ. Given V = 330 m/s and n = 1000 Hz. λ = V / n = 330 / 1000 = 0.33 m. Answer: 0.33 m…

Card 5Frequency and wavelength

A wave has frequency 100 Hz and another has frequency 500 Hz. Which has the larger wavelength?

Answer

For the same velocity, wavelength and frequency are inversely related. The 100 Hz wave has the larger wavelength, so its crests are farther apart.

Card 6Wave formulas

What is the relation between time period and frequency?

Answer

Time period is inversely related to frequency. Formula: T = 1/n Here, T is time period and n is frequency.

Card 7Wave formulas

What is the relation between wave velocity, frequency, and wavelength?

Answer

Wave velocity is given by V = n × λ. Here, V is velocity, n is frequency, and λ is wavelength.

Card 8Types of waves

Why are sound waves called mechanical waves?

Answer

Sound waves need a material medium to travel. They move by causing particles of the medium to vibrate, so they are mechanical waves.

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Frequently Asked Questions

What are the important topics in Sound and Communication for NIOS Class 10 Science & Tech?
Key topics in Sound and Communication include Sound and Communication Concept Overview, Overview of different types of communication methods and technologies, Process of sound production and perception from vibration to hearing. These are the concepts NIOS Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Sound and Communication — NIOS Class 10 Science & Tech?
Understand the core concepts first, then work through the 43 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Sound and Communication?
There are 42 flashcards for Sound and Communication covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

Sources & Official References

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

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