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Statement 1: Blood is a _____ Statement 2: Thixotropic fluids are fluids whose viscosity decreases when subjected to shear stress initially but eventually with time, the viscosity increases.

Correct Answer: Casson plastic, True
Blood is a Casson plastic. At low shears, they’ve infinite viscosity. At high shears, its viscosity decreases with increase in shear. Statement 2 is true.

Presence of tail water in a gravity dam
i) increases the principal stress
ii) decreases the principal stress
iii) increases the shear stress
iv) decreases the shear stress
The correct answer is

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?

Statement 1: For non-Newtonian fluids, another term called apparent viscosity is used as their viscosity changes with the change in the shear rate. Statement 2: For non-Newtonian fluids, between the transition region, the power number for non-Newtonian fluids is slightly higher than that for Newtonian fluids.

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum shear stress will be

Are these statements about the pseudoplastic fluids true? Statement 1:The viscosity of these fluids decreases as the shear rate decreases. Statement 2: Tomato puree is an example of pseudoplastic fluid.

Statement 1: Considering the equation, μ_a= τ/γ = Kγ(n-1) , for pseudo plastic fluids, n<1 and they’re called Shear thinning liquids and dilatant fluids are called Shear thickening liquids as n>1. Statement 2: Cooked starch solution is a Shear thinning liquid and dairy cream is a Shear thickening liquid.

What is the characteristic variation shown by the thixotropic fluids in their shear stress vs. rate of shear strain graph?

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
Which one of the following options is correct?

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The minimum normal stress will be