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

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. 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

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. 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

5. 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

6. A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is________________?

   A. 4.4 KPa
   B. 2.94 KPa
   C. 3.7 KPa
   D. None of these

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 fluid property, due to which, mercury does not wet the glass is__________________?

   A. Surface tension
   B. Viscosity
   C. Cohesion
   D. Adhesion

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. 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