# NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1532 - 1537 of 2000

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## Question number: 1532

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### Question

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

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## Question number: 1533

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### Question

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

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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

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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

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### Question

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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## Question number: 1537

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### Question

Water is falling at the rate of per . The height of the fall is about . The potential energy of water when it falls on the blades will be conveyed to them and is converted into of blades. Take the value of as . Estimate the power that could be generated, if energy is not lost otherwise.

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