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Physics

Physics
Light year is a unit of

Time
Light
Distance
Intensity of light

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

Four times
Double
Half
One–fourth

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Physics
In a Laser (say neon laser) all the atoms emit the light waves of

Same amplitude
Same phase
Same frequency
All of these

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Physics
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

The blue ray
The violet ray
The red ray
The green ray

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Physics
Tungsten is used for the manufacture of the filament of an electric bulb, because

It has a very high melting point
It is malleable
It is a good conductor
It is economical

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Physics
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

Zero
Same as the weight of the man
Greater than the weight of the man
Less than the weight of the man

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