Viscosity of atmospheric air may be about _____________ centipoise?

Related Mcqs:

1. Viscosity of 1 centipoise is equal to 1 Centistoke in case of________________?

   A. Water
   B. Mercury
   C. Carbon tetrachloride
   D. None of these

2. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to – 100°C is ____________________?

   A. 10.73 kJ
   B. 16.15 kJ
   C. 18.11 kJ
   D. 18.33 kJ

3. Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________?

   A. 1.72
   B. 0.58
   C. 0.5
   D. 0.2

4. A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?

   A. 380
   B. 630
   C. 760
   D. 880

5. The viscosity of water at room temperature may be around one ___________________?

   A. Centipoise
   B. Poise
   C. Stoke
   D. Both B. & C.

6. Kinematic viscosity of 1 m2 /second is equivalent to _____________ stokes?

   A. 10
   B. 102
   C. 103
   D. 104

7. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3. The diffusivity of aniline in air is 0.74 × 10-5m2/s. The numerical value of mass transfer co-efficient is 7.4 × 10-3. Its units are_______________________?

   A. m/s
   B. cm/s
   C. mole/m2.s.Pa
   D. k.mole/m2.s.Pa

8. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?

   A. PvB
   B. xB.PvB
   C. (Patm – Pvw)xB
   D. xB.Patm

9. The unit of dynamic viscosity is_________________?

   A. Stoke
   B. Poise
   C. gm/cm sec
   D. Both B. & C.

10. Which of the following is not a unit of kinematic viscosity ?

    A. Poise
    B. Stoke
    C. cm2/second
    D. None of these