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Category: Class 9

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?

Class 9 Physics Sound
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Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?

Class 9 Physics Sound
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Why is sound wave called a longitudinal wave?

Class 9 Physics Sound
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QUESTION : What is the single major memory that comes to the poet’s mind? Who are the “darling dreamers” he refers to?

Exam Class 9
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QUESTION : What does the poet like to do when it rains?

Class 9 English
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QUESTION : What do the following phrases mean to you? Discuss:

Class 9 English
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SUMMARY 

Class 9 English
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QUESTION : Do you find this story funny? What are the humorous elements in it? (Pick out at least three, think about what happens, as well as how it is described.)

Class 9 English
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Cite an experiment to show that sound needs a material medium for its propagation.

Class 9 Physics Sound
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Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.

Class 9 Physics Sound
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What is sound and how is it produced?

Class 9 Physics Sound
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A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

Class 9 Physics Sound
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