Which of the following forces does not act on a fluid at rest ?

Related Mcqs:

1. Inertial forces are obtained, when the elastic forces are multiplied by ______________ number?

   A. Mach
   B. Froude
   C. Reynolds
   D. Euler

2. Gage pressure within a spherical droplet of a fluid is ‘p’. What will be gage pressure within a bubble of the same size & of the same fluid ?

   A. p
   B. 2 p
   C. 0.5 p
   D. 0.25 p

3. A fluid is termed as the Newtonian fluid, when the shear stress is _________________ the velocity gradient ?

   A. Independent of
   B. Inversely proportional to
   C. Directly proportional to
   D. None of these

4. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is ______________ °C?

   A. 20
   B. 60
   C. 120
   D. ∞

5. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

   A. 9,100
   B. 13,000
   C. 7,000
   D. 2,550

6. Friction factor for fluid flow in pipe does not depend upon the________________?

   A. Pipe length
   B. Pipe roughness
   C. Fluid density & viscosity
   D. Mass flow rate of fluid

7. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the_________________?

   A. Pipe roughness & pipe diameter
   B. Fluid velocity
   C. Type of flowing fluid
   D. Both B. & C.

8. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the___________________?

   A. Length of the pipe
   B. Diameter of the pipe
   C. Density of the fluid
   D. Velocity of the fluid

9. The temperature at which ferromagnetic material can no longer be magnetized by the outside forces, is termed as the____________________?

   A. Critical point
   B. Curie temperature
   C. Inversion temperature
   D. Eutectic temperature

10. For the Stoke’s law to be valid in the case of a falling sphere in a fluid, the_____________________?

    A. Reynolds number (based on sphere diameter) should be < 1
    B. Flow around the sphere should be in turbulent region
    C. Sphere must be metallic
    D. Fluid density should be constant