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Physics

Physics
An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is

25 J
40 J
20 J
10 J

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Physics
Which one is not a part of Kepler's Law?

Law of areas
Law of orbits
Law of periods
Law of speed

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Physics
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is

Of higher intensity when train arrives
Of higher pitch when train arrives
The same in both cases in all respects
Of higher pitch when train departs

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Physics
A single fixed pulley is used to draw water from a well because

Force is applied in a convenient direction
Mechanical advantage is high
Efficiency is 100%
Velocity ratio is low

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Physics
Amount of water vapour in the atmosphere is measured in terms of

All of these
Droplets
Smog
Humidity

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Physics
Who is the first person to define speed

Newton
Galileo
Ptolemy
Kepler

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