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GATE Exam Questions - Engineering

Q1:

The stress-strain diagram for two materials A and B is shown below.

The following statements are made based on this diagram :
  1. Mateiral A is more brittle than material B.
  2. The ultimate strength of material B is more than that of A.

With reference to the above statements, which of the following applies ?

A Both the statements are false.

B Both the statements are true.

C I is true but II is false.

D I is false but II is true.

ANS:D - I is false but II is true.

Option C is correct.

You can see from the graph of A. It can take more stress suddenly the line stops means it is broken. So it is brtittle as it cannot take any more strain (or deformation).

B is again elongating under the stress till the breaking point so the material is like a ductile material. But the ultimate stress it can take is less than A. So option C.