Physics
Optical Fibre technology works on which of these principles of Physics?

Photoelectric effect
Bernoulli's Principle
Newton's law of Motion
Total internal reflection of Light

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to expansion in summer can be avoided
Steel can be saved
Air-gaps are necessary for bearing the weight of running train
Accidents due to contraction in winter can be avoided

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