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JAMB Physics 2011 Question 9

Question 9

Structure of Matter and Kinetic Theory

If a tube of small radius opened at both ends is placed in a liquid, the liquid will

  1. A.fall below the liquid level if the liquid does not wet the glass
  2. B.rise above the liquid level if the liquid does not wet the glass
  3. C.remain at the same level irrespective of whether the liquid wets the glass or not
  4. D.fall below the liquid level if the liquid wets the glass.
Show the answer and explanation

Answer: A (fall below the liquid level if the liquid does not wet the glass)

Explanation

A liquid that does not wet glass (like mercury) is depressed in a capillary tube, falling below the outside level. A wetting liquid (like water) rises.