Physics Paper 2, Nov/Dec. 2012  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments

Question 7

  Question 7
 Explain the rise of water in a narrow tube dipped vertically in a though of water.


    Most candidates were defining capillarity instead of the explanation.  Some could not relate the observation to the concept of capillarity and the forces of adhesion and cohesion.  The question was poorly attempted.
The expected answer is
 The rise of water is a result of capillarity.                                                                       
The force of attraction/adhesion between the molecules of water and those of the tube is greater than cohesion among water molecules.   So water clings to the wall of the tube causing the rise.



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