Physics
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

Newton's second law
Pascal's law
Law of inertia
Newton's third law

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Physics
A cyclist leans inwards when he is negotiating a curve so that

No frictional force may be produced between the wheels and the axle
His weight may be reduced
He may increase his speed
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

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Physics
The sky appears blue because

All colours interfere to produce blue
It is actually blue
The atmosphere scatters blue colour more than the others
In white light, the blue component dominates

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