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Physics

Physics
A person does some work of 1,000 J in 2 s. His power will be ________

500W
25W
1000W
50W

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Physics
What should a person on a freely rotating turn table do to decrease his (angular) speed ?

Sit down with raised hands
Spread his hands outwards
Bring his hands together
Raise his hands up

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Physics
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

Iron, air and water
Air, water and iron
Iron, water and air
Water, iron and air

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Physics
An aircraft can perform aerobatic manoeuvres in a vertical loop because of

Centripetal force
Gravity
Centrifugal force
Weight

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Physics
Stress can be defined as ________ quantity.

Vector
Phasor
Tensor
Scalar

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Physics
Suitable impurities are added to a semiconductor depending on its use. This is done in order to

increase its electrical conductivity
increase its electrical resistivity
increase its life
enable it to withstand higher voltages

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