The normal stress is the same in all directions at a point in a fluid, when the fluid is__________________?

Related Mcqs:

1. Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?

   A. A, C, D
   B. B, D, E
   C. A, B, E
   D. A, D, E

2. The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and___________________?

   A. Moving
   B. Static
   C. Cold
   D. Hot

3. An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonian fluid beyond yield stress. Which of the following is an ideal plastic ?

   A. Sewage sludge
   B. Rubber latex
   C. Blood
   D. Sugar solution

4. A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, η0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is________________?

   A. 10 KPa
   B. 20 KPa
   C. 30 KPa
   D. 40 KPa

5. 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

6. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid?

   A. Bingham
   B. Newtonian
   C. Perfect
   D. None of these

7. A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an _____________ fluid?

   A. Newtonian
   B. Non-Newtonian
   C. Ideal
   D. Incompressible

8. The pressure drop per unit length of pipe incurred by a fluid ‘X’ flowing through pipe is Δp. If another fluid ‘Y’ having both the specific gravity & density just double of that of fluid ‘X’, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?

   A. Δp
   B. 2Δp
   C. Δp2
   D. Δp/2

9. In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ?

   A. Rotational
   B. Unsteady
   C. Turbulent
   D. Non-uniform

10. The distribution of shear stress in a stream of fluid in a circular tube is_____________________?

    A. Linear with radius for turbulent flow only
    B. Linear with radius for laminar flow only
    C. Linear with radius for both laminar & turbulent flow
    D. Parabolic with radius for both laminar & turbulent flow