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Sound and Communication — Flashcards

NIOS · Class 10 · Science & Tech

42 flashcards for Sound and Communication (NIOS Class 10 Science & Tech) to test yourself on key terms and facts.

43 questions42 flashcards3 formulas & key relations5 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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One of 13 illustrations for Sound and Communication in Super Tutor — alongside flashcards, concept maps and practice questions.

42 Flashcards·
Sound and vibrationMedium for soundSpeed of light and soundWave calculationFrequency and wavelengthWave formulasTypes of waves
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, vibration, and wave nature, Mechanical and electromagnetic waves, Nature, measure, and quality of sound, Musical sound and instruments. Study these first, then practise questions on each for the NIOS Class 10 board exam.
How many flashcards are available for Sound and Communication?
There are 42 flashcards for Sound and Communication covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Sound and Communication for the NIOS Class 10 board exam?
Learn the core ideas first, then work through the 43 practice questions on Sound and Communication. Revise 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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