Physics
The oil in the wick of lamp rises due to

Pressure difference
Force of cohesion
Low viscosity of oil
Pheonomenon of capillarity

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Physics
Siphon will fail to work if:

The level of the liquid in the two vessels are at the same height.
The temperature of the liquids in the two vessels are the same.
Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.

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Physics
The Hooke's law is valid for

Elastic as well as plastic region of the stress strain curve
Only proportional region of the stress strain curve
Entire elastic region of the stress strain curve
Entire stress strain curve

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