Multiple choice

In an oil lamp, the oil rises in the wick due to

  1. capillary action

  2. atmospheric pressure

  3. viscosity of oil

  4. change in temperature
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A Correct answer
Explanation

Capillary action is the ability of a liquid to flow in narrow spaces without external forces. The wick in an oil lamp contains very narrow pores, and the oil rises up through these tiny channels due to capillary action and surface tension, not atmospheric pressure or viscosity.

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