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

Related Mcqs:

1. 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

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

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

3. Rise of liquid in a capillary tube is due to_________________?

   A. Cohesion
   B. Adhesion
   C. Both A. & B.
   D. Neither A. nor B.

4. 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

5. 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

6. A rectangular surface 3′ × 4′, has the lower 3 edge horizontal and 6′ below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water) ?

   A. 39.6y
   B. 48y
   C. 49.2y
   D. 58y

7. 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

8. 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

9. Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?

   A. H
   B. 12.6 H
   C. 13.6 H
   D. 14.6 H

10. Ratio of inertial forces to surface tension forces is called the _____________ number?

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