Newton’s law of viscosity relates________________?

Related Mcqs:

1. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is__________________?

   A. 0.25
   B. 0.50
   C. 1.0
   D. none of the above

2. The eddy viscosity for turbulent flow is______________?

   A. a function of temperature only
   B. a physical property of the fluid.
   C. dependent on the flow
   D. independent of the flow

3. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is________________?

   A. less than 1
   B. between 1 and 100
   C. 160
   D. 200

4. A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?

   A. less than 1 m/sec
   B. 1 m/sec
   C. 1.5 m/sec
   D. 2 m/sec

5. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?

   A. laminar flow
   B. transition flow
   C. turbulent flow
   D. not predictable from the given data

6. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be_________________?

   A. 300
   B. 337.5
   C. 600
   D. 675

7. The unit of kinematic viscosity is_______________?

   A. gm/cm-sec2
   B. dyne-sec/cm2
   C. gm/cm2-sec
   D. cm2/sec

8. The viscosity of a gas_______________?

   A. decreases with increase in temperature
   B. increases with increase in temperature
   C. is independent of temperature
   D. is independent of pressure for very high pressure intensities

9. If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then_____________?

   A. the pressure throughout the liquid mass is atmospheric
   B. there will be vacuum in the liquid
   C. the pressure in the liquid mass is greater than hydrostatic pressure
   D. none of the above

10. The Prartdtl mixing length is_________________?

    A. zero at the pipe wall
    B. maximum at the pipe wall
    C. independent of shear stress
    D. none of the above