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_________________?

Related Mcqs:

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

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

2. 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

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

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

5. 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

6. 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

7. Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around________________?

   A. 2000
   B. 10
   C. 100
   D. 1000

8. The valve commonly used in pipes larger than 2″ dia is a______________?

   A. Globe valve
   B. Plug-cock
   C. Gate valve
   D. Check valve

9. 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

10. A fluid (μ/ρ) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is _______________ cm/sec?

    A. 7
    B. 700
    C. 7000
    D. 630