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

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

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Water in the pipes freezes and on freezing water expands, so pipes break
Frost makes the pipes rusty, so they break
The material of which pipes are made contracts due to cold and so breaks
None of these

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Physics
Should cars have bumpers that collapse under impact?

No, since it would be very expensive to get the car repaired
No, since the colliding car would then ram into the occupants and kill them
Yes, since the offending car should get damaged and pay for the mistake
Yes, since they help to absorb the impact of a collision and keep the occupants safe

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