Question

In plotting stress versus strain curves for two materials P and Q, a student by mistake puts strain on the y-axis and stress on the x-axis as shown in the figure.

Then the correct statement (s) is (are):

(a) P has more tensile strength than Q

(b) P is more ductile than Q

(c) P is more brittle than Q

(d) The Young’s modulus of P is more than that of Q.

Answer 1

Correct options are : (a) and (b)

(a) (b) Breaking stress of P > Breaking stress of Q

∴ P is more tensile than Q.

∴ option (a) is correct.

But P is also more ductile than Q.

∴ Option (b) is correct.

But P is less brittle than Q.

∴ Option (c) is not correct.

Young's modulus, Y =  \(\frac{ Stress}{Strain }\)

For any given value of stress, strain in P is more than in Q.

∴ Y_P < Y_Q