Proof strength is defined as the stress which will produce a permanent extension of how much percentage in the gauge length of the standard test specimen.

Proof strength is defined as the stress which will produce a permanent

1.	Proof strength is defined as the stress which will produce a permanent extension of how much percentage in the gauge length of the standard test specimen.
A.	0.1
B.	0.2
C.	0.3
D.	0.4
Answer» B. 0.2