Physics
Optical fibres are based on the phenomenon of

Diffraction
Interference
Total Internal Reflection
Dispersion

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Physics
Kinetic energy depends on

The mass of the moving body
Both mass and velocity of the moving body
The velocity or speed of the moving body.
The pressure of the moving body

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Physics
Ice is packed in saw dust because

Saw dust will not get melted easily.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.
Saw dust is poor conductor of heat.

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