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Why do birds chirp?

Important Questions on We Hear Sound

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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
How many biodiversity hotspots are there in the world?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds

Draw a cross-section of a leaf and label it properly.

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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds

Define the following:

Biodiversity

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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Why do cat purrs?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
What do you mean by the purring?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Is the chirping of birds pleasant or unpleasant sound?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds

Loud sounds are pleasant sounds.

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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Which of the following sounds in not categorised as noise?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Choose the odd one out:
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
To speak softly without using the vocal cord is known as _____. (shout/ whisper)
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Which of the following can make the whispering sound?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Which of the following animal make a purring sound?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds

Name the following:

It tells us how loud or soft a sound is.

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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Name the type of sounds made by a cat.
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Which of the following is a pleasant sound?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Which of these is not a noise?
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds

Find the related word of the following: 

Hear: Ear:: whisper:?

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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds

Lions can make the whisper sound.

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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Write 'P' for pleasant and 'U' for unpleasant sound.
Chirping of a bird: _____.
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Environmental Studies>The World Around Me>We Hear Sound>Some Soft Sounds
Very loud and unpleasant sound is called _____.