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Physics Paper 2, Nov/Dec. 2009  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
Strength












Question 6
Part I:      Candidates were required to answer any five questions from this part.

Define:

  1. elastic limit:
  2. yield point.
_____________________________________________________________________________________________________
Observation

This question was very popular among the candidates.  However, it was poorly attempted.  Majority of the candidates defined elastic limit by referring to it as a point.

The expected answers are:

 Elastic Limit:
The minimum stress/force applied on an elastic material beyond which a permanent deformation occurs.
                                                                                   
Yield Point
The point on a stress/strain or load/extension graph beyond which the elasticmaterial becomes plastic.   

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