Section 4: Soil and Water Conservation Engineering
Fluid Mechanics
Subtopic: Ideal and real fluids, properties of fluids
Question Statement:
A fluid in which shear stress is more than the yield value and proportional to the rate of shear strain is called
Options:
(A) Newtonian fluid
(B) Non-Newtonian fluid
(C) Ideal plastic fluid
(D) Real fluid
Official Answer Key:
C
Step-by-Step Solution & Explanation
A fluid that requires a finite yield stress to be exceeded before it flows, and thereafter shows a linear (proportional) relationship between the excess shear stress and rate of shear strain, is classically termed an ideal plastic (Bingham plastic) fluid. Newtonian fluids (A) have no yield stress; non-Newtonian (B) is too general (includes non-linear behaviours); real fluid (D) just means viscous/compressible, unrelated to yield behaviour.
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