Question

Match List-I with List-II.

List-I (Property)		List-II (Fluid type)
(A)	Apparent viscosity decreases with increasing deformation rate	(I)	Dilatant fluids
(B)	Shear stress is directly proportional to rate of deformation	(II)	Newtonian fluids
(C)	Behaves as a solid until a minimum yield stress is exceeded and subsequently exhibits a linear relation between stress and rate of deformation	(III)	Pseudoplastic fluids
(D)	Viscosity increases with increasing deformation rate	(IV)	Bingham-plastic fluids
(E)	Shear stress is not directly proportional to deformation rate	(V)	Non-Newtonian fluids

Choose the correct answer from the options given below.

• (A) - (III), (B) - (II), (C) - (IV), (D) - (I), (E) - (V)
• (A) - (II), (B) - (V), (C) - (I), (D) - (III), (E) - (IV)
• (A) - (IV), (B) - (I), (C) - (V), (D) - (II), (E) - (III)
• (A) - (V), (B) - (III), (C) - (IV), (D) - (II), (E) - (I)

Hint:

Recall which fluid type gets thinner with shearing, which gets thicker, and which needs a yield stress before it starts to flow.

Answer 1

The Correct Option is A

A quick way to solve this kind of matching is to sort the fluid types into three simple buckets first, fluids that thin out under shear, fluids that thicken under shear, and fluids that need a push before they even start to flow.

Newtonian fluids are the baseline case where stress and strain rate are simply proportional, no thinning, no thickening, no yield stress. That matches statement (B), so (B) - (II).

Pseudoplastic (shear thinning) fluids lose apparent viscosity as shear rate goes up, matching statement (A), so (A) - (III).

Dilatant (shear thickening) fluids gain apparent viscosity as shear rate goes up, matching statement (D), so (D) - (I).

Bingham plastic fluids sit still like a solid until a yield stress is crossed, after which stress rises linearly with strain rate, matching statement (C), so (C) - (IV).

Non-Newtonian is simply the umbrella term for any fluid where stress is not directly proportional to strain rate, which is exactly statement (E), so (E) - (V).

\[\boxed{(A)\text{-}(III),\ (B)\text{-}(II),\ (C)\text{-}(IV),\ (D)\text{-}(I),\ (E)\text{-}(V)}\]