# Practice Test: Question Set - 15

1. Free surface of a liquid tends to contract to the smallest possible area due to force of
(A) Surface tension
(B) Viscosity
(C) Friction
(D) Cohesion

2. The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.
(A) The bodies A and B have equal stability
(B) The body A is more stable than body B
(C) The body B is more stable than body A
(D) The bodies A and B are unstable

3. The rise or depression of liquid in a tube due to surface tension will increase in size of tube will
(A) Increase
(B) Remain unaffected
(C) May increase or decrease depending on the characteristics of liquid
(D) Decrease

4. A body floats in stable equilibrium
(A) When its meatcentric height is zero
(B) When the metacentre is above e.g.
(C) When its e.g. is below its center of buoyancy
(D) Metacentre has nothing to do with position of e.g. for determining stability

5. The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)
(A) wA
(B) wx
(C) wAx
(D) wA/x

6. The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
(A) Less than
(B) More than
(C) Equal to
(D) None of these

7. The line of action of the buoyant force acts through the Centroid of the
(A) Submerged body
(B) Volume of the floating body
(C) Volume of the fluid vertically above the body
(D) Displaced volume of the fluid

8. The intensity of pressure at any point, in a liquid, is
(A) Directly proportional to the area of the vessel containing liquid
(B) Directly proportional to the depth of liquid from the surface
(C) Directly proportional to the length of the vessel containing liquid
(D) Inversely proportional to the depth of liquid from the surface

9. During the opening of a valve in a pipe line, the flow is
(C) Uniform
(D) Laminar

10. A manometer is used to measure
(A) Atmospheric pressure
(B) Pressure in pipes and channels
(C) Pressure in Venturimeter
(D) Difference of pressures between two points in a pipe

11. For hypersonic flow, the Mach number is
(A) Unity
(B) Greater than unity
(C) Greater than 2
(D) Greater than 4

12. The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
(A) 2gH
(B) H × √(2g)
(C) 2g × √H
(D) √(2gh)

13. For pipes, laminar flow occurs when Reynolds number is
(A) Less than 2000
(B) Between 2000 and 4000
(C) More than 4000
(D) Less than 4000

14. When the flow in an open channel is gradually varied, the flow is said to be
(A) Steady uniform flow
(B) Steady non-uniform flow
(C) Unsteady uniform flow
(D) Unsteady non-uniform flow

15. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called
(B) Cohesion
(C) Viscosity
(D) Compressibility

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