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Question 11 Mark

Fill in the following blanks with suitable word: When the frequency of the sound is increased, the wavelength ______.

Answer

When the frequency of the sound is increased, the wavelength decreases.

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Question 21 Mark

Fill in the following blanks with suitable word: Loudness of sound depends on _____.

Answer

Loudness of sound depends on amplitude.

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Question 31 Mark

Fill in the following blanks with suitable word: Sound cannot travel through _____.

Answer

Sound cannot travel through vacuum.

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Question 41 Mark

Fill in the following blanks with suitable word: An echo is simply a ______ Sound.

Answer

An echo is simply a reflected Sound.

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Question 51 Mark

Light travels ________ than sound, thus, flash of lightning is seen much ________ than the sound of thunder is heard.

Answer

Light travels fast than sound, thus, flash of lightning is seen much earlier than the sound of thunder is heard.
Explanation:
In nature, a lightning flash and the associated thunder occur at almost the same time in a thunderstorm. A person on the ground sees the lightning flash before hearing the thunder because light at a speed of around $300,000,000$ meters per second travels much faster than sound which moves at $340$ meters per second.

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Question 61 Mark

Fill in the following blanks with suitable word: Sound is caused by _____.

Answer

Sound is caused by vibrations.

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Question 71 Mark

Fill in the following blanks with suitable word: Wave speed in metres per second equals frequency in _____ Multiplied by ______ in ______.

Answer

Wave speed in metres per second equals frequency in Hertz Multiplied by wavelength in metres.

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Question 81 Mark

Bats detect their prey with the help of _________ squeaks.

Answer

Bats detect their prey with the help of Echolocation squeaks.
Explanation:
Echolocation is the use of sound waves and echoes to determine where objects are in space. Bats use echolocation to navigate and find food in the dark. To echolocate, bats send out sound waves from the mouth or nose. When the sound waves hit an object they produce echoes.

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Question 91 Mark

Fill in the following blanks with suitable word: The speed of sound in a solid is ____ than the speed of sound in air.

Answer

The speed of sound in a solid is greater than the speed of sound in air.

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Question 101 Mark

Music is a sound of rich ________.

Answer

Music is a sound of rich Rhythem.Explanation:
Music is a sound of rich Rhythem.

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Question 111 Mark

Fill in the following blanks with suitable word:
Echoes are caused by the ______ of sound.

Answer

Echoes are caused by the reflection of sound.

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Question 121 Mark

Fill in the following blanks with suitable word: A sound wave consists of places of higher pressure called _____ and places of _____ pressure called _____.

Answer

A sound wave consists of places of higher pressure called compressions and places of lower pressure called rarefactions.

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Question 131 Mark

Fill in the following blanks with suitable word:
Pitch od sound depends on ______.

Answer

Pitch od sound depends on frequency.

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Question 141 Mark

Fill in the following blanks with suitable word: Quality of sound depends on _____.

Answer

Quality of sound depends on waveform.

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Question 151 Mark

Separation between a compression and rarefaction is _________ the wavelength.

Answer

Separation between a compression and rarefaction is longitudinal the wavelength.Explanation:
The wavelength in a longitudinal wave is the distance between two consecutive points that are in phase.

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