As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, $$\mu $$ = fluid viscosity)

As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity)

A

1/μ

B

μ

C

μ²

D

1/μ²

Which of the following factors are affecting critical shear stresses? 1. Purity of metals reduces the critical shear stress 2. Surface films greatly enhance the critical shear stress 3. Rise in temperature 4. Rate of deformation and the extent of initial deformation also help in raising the critical shear stress

A

1, 2 and 3 only

B

1, 2 and 4 only

C

1, 3 and 4 only

D

1 ,2, 3 and 4

Tresca or maximum-shear stress criteria assumes that yielding occurs when the maximum shear stress reaches a value of the shear stress in the uniaxial tension test. Assume the principal stress being σ1, σ2, σ3 where σ1 is largest, and σ3 is the smallest principal stresses. Find the value of minimum shear stress to cause yielding, given that yield stress in tension is equal to σo?

A

τ = σo

B

τ = σo/2

C

τ = σo/3

D

τ = σo/4

Fluid which does not follow the newtons law that is shear stress is not proportional to rate of shear strain known as

A

newtons law of viscosity

B

non-newtonian fluids

C

$$\tau = \mu $$

D

$$\tau = \frac{{du}}{{dy}}$$

The Rheological behaviour of concrete, when represented by shear stress vs rate of shear, is characterized as Where : τ shear stress, Τ0 = (initial) yield value, μ = at-point plastic viscosity, γ̇ = at point rate of shear.

A

τ = τ₀ + μ . γ̇

B

τ₀ = τ + μ . γ̇

C

$\frac{\tau }{{{\tau _0}}} = \mu .\dot \gamma$

D

τ = μ . γ̇

A lady wants to buy the following items in the given price range- 1. Tomato between Rs. 40 and Rs. 45 per kg. 2. Grapes in the price range of Rs. 80 and Rs. 90 per kg. 3. Milk packets at Rs. 23 per liter. In which shop from the following will she definitely get all her items/ A. Shop S sells tomato at Rs. 22.5 per half kg, Grapes at Rs. 82 per kg and milk at Rs. 24 per liter. B. Shop H sells grapes at Rs. 21 per quarter kg, milk at 12.5 per half litre and tomato at Rs. 22 per half kg. C. Shop O sells milk at Rs. 11.5 per half litre, tomato at 21 per half kg and grapes at Rs. 43 per half kg. D. Shop P sells tomato at Rs. 23.5 per half kg, grapes at Rs. 85 per kg and milk at Rs. 23 per litre.

A

B

D

C

B

D

C

A fluid, in which shear stress is more than the yield value and shear stress is proportional to the rate of shear strain is known as:

A

Newtonian fluid

B

Ideal Plastic Fluid

C

Real Fluid

D

Ideal fluid

Newton law of viscosity states that shear stress is proportional to rate of shear at any point in the fluid.

A

True

B

False

Shear stress versus shear rate behavior of four different types of fluids (I, II, III and IV) are shown in the figure below.
Basic Principles of Biotechnology mcq question image

Basic Principles of Biotechnology mcq question image

Which one of the following options is correct?

A

I-Newtonian, II-Bingham plastic, III-Dilatant, IV-Pseudoplastic

B

I-Pseudoplastic, II-Dilatant, III-Newtonian, IV-Bingham plastic

C

I-Newtonian, II-Pseudoplastic, III-Bingham plastic, IV-Dilatant

D

I-Newtonian, II-Bingham plastic, III-Pseudoplastic, IV-Dilatant

In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient ).

A

V²

B

1/V²

C

1/Vg

D

Vg

As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, $$\mu $$ = fluid viscosity)

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