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Physics

Physics
In the absence of the earth's atmosphere, sky would appear

Black
Blue
Deep red
White

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Physics
What is the SI unit of Force?

Watt
Newton
Boyle
Pascal

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Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

5 R/4
5 R
R/5
4 R/5

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Physics
A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is

Zero
More than one
Less than one
One

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Physics
Sending a frame to a group of stations is known as

Single casting
Spreading
Multicasting
Casting

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Physics
Which of the following parts of the sunlight makes the solar cooker hot ?

Infra red
Ultra violet
Cosmic rays
Red light

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