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Physics

Physics
An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is

10 J
20 J
25 J
40 J

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Physics
Fuse wire is made of an alloy of

Lead and Copper
Tin and Copper
Copper and Silver
Tin and Lead

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Physics
The width of depletion layer of a P-N junction

Is independent of applied voltage
Increases with heavy doping
Is increased under reverse bias
Decreases with light doping

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Physics
Period of oscillation of 3 cm microwaves in seconds is

1 × 10–10
1 × 1010
0.01
0.001

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Physics
Fibre optics work on the principle of

Total internal absorption
Optical rotation
Total internal reflection
Scattering of light

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Physics
Which of the following is correct about the properties of Gravitational Forces?

They are the strongest forces in nature
None
Both a and b
They observe inverse square law

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