Question

When a fluid is at rest, the shear stress is-

• A. Very large
• B. Zero
• C. Undefined
• D. Finite

Answer 1

Answer:

B. Zero

When a fluid is at rest, it does not resist shear stress as a solid does. Any amount of shear stress applied to a fluid will cause it to move and deform continuously. Therefore, a fluid at rest must be in a state of zero shear stress.