Physics
Oil rises up the wick in a lamp because

Of the surface tension phenomenon
Of the capillary action phenomenon
Oil is very light
Of the diffusion of oil through the wick

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Physics
Stationary wave is formed by

Two waves of the same speed superposing
Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction
A transverse wave superposing a longitudinal wave

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