Which of the following statement is not correct about loaded spiral spring?

A. The extension is proportional to the load applied, provided the elastic limit is not exceeded
B. If the elastic limit is not exceeded, the contraction is proportional to the load removed.
C. Up to the yield limit, the extension is no longer proportional to the applied load.
D. Beyond the elastic limit, the extension is no longer proportional to the applied load.
E. If the string regains its shape or form after deformation, it is said to be elastic.

Correct Answer:

Option C – Up to the yield limit, the extension is no longer proportional to the applied load.