Physics
A water tank appears shallower when it is viewed from top due to

Refraction
Rectilinear propagation of light
Reflection
Total internal reflection

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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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Physics
Which of the following is not a property of heavy water ?

Density of heavy water is higher than that of ordinary water
Freezing point of heavy water is higher than that of ordinary water
It produces corrosion
Boiling point of heavy water is lower than that or ordinary water

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