Question

Match List-1 (Curves labelled A, B, C and D in figure) with List-2 (Type of fluid) and select the correct answer using the codes given below the lists:

List-1

List-2
1. Ideal plastic
2. Ideal
3. Non-Newtonian
4. Thixotropic
5. Rheopectic

• A. A-2, B-3, C-1, D-5
• B. A-3, B-2, C-1, D-5
• C. A-4, B-2, C-5, D-1
• D. A-2, B-3, C-5, D-1

Answer 1

The correct option is A A-2, B-3, C-1, D-5

Horizontal line representing zero shear stress for any velocity gradient is the condition for ideal fluid.
The curve B represents dilatant fluid.

$\tau =\mu {\left(\frac{du}{dy}\right)}^{n}n>1$

For pseudoplastic fluid,
$\tau =\mu {\left(\frac{du}{dy}\right)}^{n}n<1$

For thixotropic fluid,
$\tau ={\tau }_0=\mu {\left(\frac{du}{dy}\right)}^{n}n<1$

For rheopectic fluid,
$\tau ={\tau }_0=\mu {\left(\frac{du}{dy}\right)}^{n}n>1$

For plastic fluid,
$\tau ={\tau }_0+\mu {\left(\frac{du}{dy}\right)}^{n}n=1$