Physics
In a optical fibre cable, the signal is propagated along the

Surface and cladding
Cladding
Both core and cladding
Inner Core

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

None
The surface of the liquid remains horizontal
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The liquid surface falls down only at the center of the tank

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