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Physics

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

Four times
One–fourth
Half
Double

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Physics
The least penetrating power ray is

Beta rays
Alpha rays
Gamma rays
None of these

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Physics
Sound waves do not show the phenomenon of

Polarisation
Diffraction
Refraction
Interference

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Physics
The scientist who first sent electromagnetic waves to distant places is

Heinrich Hertz
Thomas Alva Edison
James Clerk Maxwell
John Logie Baird

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Physics
The velocity required to place a vehicle in orbit around the moon is ________ that required to place it in orbit round the earth.

Equal to
Greater than
Less than
Greater than or equal to

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Physics
A pilot has to release the bomb to hit a target

None of these
Before the target
Beyond the target
Right above the target

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