WAEC Physics 2016 Objective — Question 3

Question 3 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.

3. The diagram above represents the graph of stress against strain for an elastic wire. The point Q on the graph is the A. elastic limit B. breaking point C. yield point D. proportional limit

A. elastic limit
B. breaking point
C. yield pointCorrect
D. proportional limit

Explanation

On a stress-strain graph, E=Elastic limit, Y=Yield point, M=Maximum load, F/B=Fracture/breaking point. Point Q corresponds to the Yield point.

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