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Physics

Physics
If a person moves a trolley for a distance of 10 m with a force of 50 N, then the work done is

5 J
20 J
500 J
0.2 J

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Physics
A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.

0.043055555555556
0.042361111111111
0.044444444444444
Cannot be found from the given information.

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Physics
Copper wires are generally used for electrical power transmission instead of iron wire because :

Copper is a better conductor of electricity than iron
Copper is cheaper than iron
Copper is lighter than iron
Copper can take higher power than iron

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Physics
Which of the following are used for accurately measuring very small time intervals ?

White dwarfs
Quartz clocks
Atomic clocks
Pulsars

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Physics
The centre of gravity of a sprinter during the race lies

Ahead of his feet
At the centre of the body
Behind his feet
To the left side of the body

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Physics
As water is cooled from 4 deg C to 0 deg C, its density

Increases
Decreases
None of these
Remains same

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