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Physics

Physics
If a copper wire is increased to double its length, its resistance will become

Double
One–fourth
Half
Four times

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Physics
During ________ motion of an object along a straight line, the velocity remains constant with time.

Linear
Equilibrium
Translational
Uniform

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Physics
The layer of atmosphere used for radio-wave transmission is

Ionosphere
Stratosphere
Chromosphere
Troposphere

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Physics
Why does a cannon recoil after firing ?

Backward thrust of gases produced
Newton's third law of motion
Conservation of energy
Newton's first law of motion

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Physics
Convex mirrors are used as a rear view mirror in motor cycles because

It forms real image
It forms smaller image as compared with object
All of these
It forms erect (upright) image

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Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

2R
R/2
5R/4
3R/4

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