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Physics

Physics
Hertz is the SI unit of

Pressure
Weight
Frequency
Power

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Physics
Why do birds not have respiratory trouble at the time of flying at high altitude ?

Their lungs are very large
They fly inactively
They have extra air sacs
They use less oxygen

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Physics
Sound travels at the fastest speed in

water
steel
vacuum
air

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Physics
Ventilators are provided near the ceiling of the room because

These do not look nice in the lower part
These provide cross ventilation in the room
These provide some sunlight in the room
The exhaled warmer air rises up and goes out

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Physics
The Law of Kepler is related with which among the following ?

Law of Conservation of energy
Law of Gravitation
Planetary Motion
None

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Physics
Which of the following is not true about X-rays?

Have low penetrating power
Can affect photographic plates
Can be reflected or refracted
Travel with the speed of light

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