With increase in the temperature, viscosity of a liquid____________________?

Related Mcqs:

1. 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

2. A gas (density = 1.5 kg/m3, viscosity = 2 × 10‒5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m3and viscosity of 3 × 10‒5kg/m.s flowing at 3 m/s will be________________?

   A. 8400 Pa/m
   B. 12600 Pa/m
   C. 18900 Pa/m
   D. 16800 Pa/m

3. With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids__________________?

   A. Increases
   B. Decreases
   C. Remain same
   D. May increase or decrease; depends on the magnitude of shear rate

4. Viscosity of water is about _____________ times that of air at room temperature?

   A. 15
   B. 55
   C. 155
   D. 1050

5. With increase in temperature, the vapor pressure of liquids__________________?

   A. Increases
   B. Increases linearly
   C. Decreases
   D. Remain constant

6. Newton’s law of viscosity relates the____________________?

   A. Shear stress and velocity
   B. Velocity gradient and pressure intensity
   C. Shear stress and rate of angular deformation in a fluid
   D. Pressure gradient and rate of angular deformation

7. Which law/principle of solid mechanics is similar/equivalent to Newton’s law of viscosity in fluid mechanics ?

   A. Archimedes principle
   B. Newton’s second law of motion
   C. Hooke’s law
   D. Newton’s third law of motion

8. The unit of dynamic viscosity in SI unit is__________________?

   A. kg/m. sec
   B. N/m2
   C. m2 /sec
   D. m/N. sec

9. The dimension of kinematic viscosity is_________________?

   A. ML-2T-1
   B. L2T-1
   C. ML-2T-2
   D. None of these

10. A Newtonian liquid (ρ = density, μ = viscosity) is flowing with velocity „v‟ in a tube of diameter ‘D’. Let Δp be the pressure drop across the length ‘L’. For a laminar flow, Δp is proportional to_________________?

    A. Lρv2/D
    B. LμV/D2
    C. Dρv2/L
    D. μV/L