Question

Statement (I): The failure of a mild steel specimen of circular cross-section, subjected to a torque occurs along its cross-section.
Statement (II): The failure occurs on a plane of the specimen subjected to maximum shear stress; and mild steel is relatively weak in shear.

• A. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I).
• B. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I).
• C. Statement (I) is true but Statement (II) is false.
• D. Statement (I) is false but Statement (II) is true.

Answer 1

The correct option is A Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I).


MS in ductile material which is weakest in shear so fail at ${\tau }_{max}$ plane.
Maximum shear stress plane will be longitudinal plane and traverse plane. (Pure shear conditions)