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JAMB Physics 1991 Question 14

Question 14

Structure of Matter and Kinetic Theory

In which of the following is surface tension important?

  1. A.The floating of a ship in water
  2. B.The floating of a dry needle in water
  3. C.The floating of a balloon in air
  4. D.The diffusion of sugar solution across a membrane.
Show the answer and explanation

Answer: B (The floating of a dry needle in water)

Explanation

A dry needle is denser than water but is held up by the stretched surface film of the water, which is surface tension. Ships and balloons float by upthrust.