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Physics

Physics
At what temperature (in Fahrenheit) pure water freezes?

48
37
32

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Physics
'Parsec' is the unit measurement of

Brightness of heavenly bodies
Density of stars
Orbital velocity of giant stars
Astronomical distance

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Physics
A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because

A parachute has a larger surface area and air resistance is more
Stone is heavier than parachute
None of these
Special mechanisms are present in parachute

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Physics
X–rays are

Negatively charged particles
None of these
Neutral particles
Positively charged particles

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Physics
The motion of a freely falling body is an example of ________ motion.

Uniformly accelerated
Non-uniformly accelerated
Constant speed
Constant velocity

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Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The mercury level starts falling
The mercury level starts rising
The bell jar breaks up
The mercury level does not change

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