NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1531 - 1536 of 2000

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Question number: 1531

» Physics » Sound

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Question

An object is below sea level. A research vessel sends down a sonar signal to confirm this depth. After how long can it expect to get the echo?

(Take the speed of sound in sea water as . )

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Question number: 1532

» Chemistry » Atoms & Molecules

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How many number of moles does 168g of iron contain?

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Question number: 1533

» Physics » Gravitation & Pressure

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If mass of the planet is three times of original mass, and radius of the planet is of the original radius, then the acceleration due to gravity is:

( is the original acceleration due to gravity).

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Question number: 1534

» Physics » Work, Energy & Power

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A particle of mass has a velocity at a certain instant. So, kinetic energy is:

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Question number: 1535

» Physics » Motion

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In , a ball covered its of its journey when it freely falling from top of a tower. The time taken to reach ground is:

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Question number: 1536

» Physics » Motion

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An object projected vertically upward from top of a building of height , reaches the ground in . If it is projected vertically downward direction from same position with same velocity, it reaches the ground in . If it falls freely from the same height, then time taken to reach ground is –

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