Physics Paper 2, May/June. 2014  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 Main

General Comments

Question 4

A metallic bar 50 cm long has a uniform cross-sectional area of 4.0 cm2.  If a tensile force of 35 kN produces an extension of 0.25 mm, calculate the value of Young’s modulus.



Very popular question among the candidates but it was poorly attempted.  Those who failed could not manipulate the standard forms involved.  The main problem of several candidates was conversion of units from “mm” to ‘m’ and ‘cm2 to m2.  Majority of the candidates were able to state the correct formula.    Teachers should give extensive classroom exercise on conversion of units to forestall future occurrence.
The expected answer is


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