Multiple choice

Consider the following statements. I. On a principal plane, only normal stress acts. II. On a principal plane, both normal and shear stresses act. III. On a principal plane, only shear stress acts. IV. Isotropic state of stress is independent of frame of reference. The TRUE statement(s) is/are

  1. I and IV

  2. II

  3. II and IV

  4. II and III
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A Correct answer
Explanation

 Principal plane is defined a plane on which only normal stress acts and shear stress is equal to zero. Hence, statement(1) is correct. isotropic state means having same properties of material in all directions (Iso-same, tropic-direction). hence, isotropic state of stress is independent of frame of reference or direction or axis.

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