Rise of liquid in a capillary tube is due to_________________?

Related Mcqs:

1. Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________?

   A. d
   B. 1/d
   C. ζ
   D. 1/ζ

2. The capillary rise of mercury is maximum in glass tube of dia _____________ mm?

   A. 0.5
   B. 1
   C. 2
   D. 5

3. Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?

   A. Q/2
   B. Q/4
   C. Q/8
   D. Q/16

4. 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

5. If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is_________________?

   A. Same in both the tubes
   B. Greater in 1 mm dia tube
   C. Greater in 0.5 mm dia tube
   D. Zero in both the tubes

6. Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is _____________ mm?

   A. 4
   C. > 12.5
   D. < 10

7. Capillary tube method of viscosity measurement is based on the ________________?

   A. Hagen-Poiseuille’s equation
   B. Stoke’s law
   C. Navier-stokes equation
   D. None of these

8. The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length?

   A. Equivalent
   B. Transition
   C. Prandtl mixing
   D. None of these

9. The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as_______________?

   A. Evaporation
   B. Cavitation
   C. Sublimation
   D. Stripping

10. Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will______________________?

    A. Increase
    B. Decrease
    C. Remain same
    D. Data insufficient to predict pressure drop