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.Management Sciences
Category: Hydraulics and Fluid Mechanics
Buoyant force is___________________?
A. resultant force acting on a floating body
B. equal to the volume of liquid displaced
C. force necessary to keep a body in equilibrium
D. the resultant force on a body due to the fluid surrounding it
E. none of the above
The peoperty by virtue of which a liquid opposes relative motion between its different layers is called_________________?
A. surface tension
B. co-efficient of viscosity
C. viscosity
D. osmosis
E. cohesion
Surface tension _____________________?
A. acts in the plane of the interface normal to any line in the surface
B. is also known as capillarity
C. is a function of the curvature of the interface
D. decreases with fall in temperature
E. has no units
A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is __________________?
A. 9,000 kg
B. 13,500 kg
C. 18,000 kg
D. 27,000 kg
E. 30,000 kg
Rain drops are spherical because of____________________?
A. viscosity
B. air resistance
C. surface tension forces
D. atmospheric pressure
E. none of the above
A large Roynold number is indication of_________________?
A. smooth and streamline flow
B. laminar flow
C. steady flow
D. turbulent flow
E. highly turbulent flow
Choose the correct relationship_________________?
A. specific gravity = gravity x density
B. dynamicviscosity = kinematicviscosity x density
C. gravity = specific gravity x density
D. kinematicviscosity = dynamicviscosity x density
E. hydrostaticforce = surface tension x gravity.
Non uniform flow occurs when ____________________?
A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the magnitude aricf direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
E. velocity, depth, pressure, etc. change from point to point in the fluid flow
Alcohol is used in manometer, because___________________?
Choose the wrong statement ?
A. its vapour pressure is low
B. it provides suitable meniscus for the inclined tube
C. its density is less
D. it provides longer length for a given pressure difference
E. it provides accurate readings.
Cavitation will begin when______________________?
A. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
B. pressure becomes more than critical pressure
C. flow is increased
D. pressure is increased
E. none of the above
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