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Home » Engineering » Aptitude Test - 81
Hassan
1.The critical radius is the insulation radius at which the resistance to heat flow is
A. Maximum
B. Minimum
C. Zero
D. Maximum
2. 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. Surface tension
3.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 have equal stability
4.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. Increase
5.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. When its meatcentric height is zero
6.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
A. wA
B. wx
C. wAx
D. wA
7.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. Less than
8. 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. Submerged body
9.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. Directly proportional to the area of the vessel containing liquid
10.During the opening of a valve in a pipe line, the flow is
A. Steady
B. Unsteady
C. Uniform
D. Steady
11.A manometer is used to measure
A. Atmospheric pressure
B. Pressure in pipes and channels
C. Pressure in Venturimeter
D. Atmospheric pressure
12. For hypersonic flow, the Mach number is
A. Unity
B. Greater than unity
C. Greater than 2
D. Unity
13.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
14. 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 2000
15.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. Steady uniform flow
16. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called
A. Adhesion
B. Cohesion
C. Viscosity
D. Adhesion
17.A fluid which obeys the Newton's law of viscosity is termed as
A. Real fluid
B. Ideal fluid
C. Newtonian fluid
D. Real fluid
18. In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than
A. Frictional force
B. Viscosity
C. Surface friction
D. Frictional force
19.The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by
A. dQ/Q = 3/2 × (dH/H)
B. dQ/Q = 2 × (dH/H)
C. dQ/Q = 5/2 × (dH/H)
D. dQ/Q = 3/2 × (dH/H)
20. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal
A. Ratio of inertial force to force due to viscosity
B. Ratio of inertial force to force due to gravitation
C. Ratio of inertial force to force due to surface tension
D. Ratio of inertial force to force due to viscosity
21.The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.
A. Decreases
B. Increases
C. Remain same
D. Decreases
22.If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
A. Higher than the surface of liquid
B. The same as the surface of liquid
C. Lower than the surface of liquid
D. Higher than the surface of liquid
23.The ratio of the inertia force to the __________ is called Euler's number.
A. Pressure force
B. Elastic force
C. Surface tension force
D. Pressure force
24.A one dimensional flow is one which
A. Is uniform flow
B. Is steady uniform flow
C. Takes place in straight lines
D. Is uniform flow
25.According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)
A. A × M × m1/2 × i2/3
B. A × M × m2/3 × i1/2
C. A1/2 × M2/3 × m × i
D. A × M × m1/2 × i2/3
26.Pascal-second is the unit of
A. pressure
B. kinematic viscosity
C. dynamic viscosity
D. pressure
27.An ideal fluid is
A. one which obeys Newton's law of viscosity
B. frictionless and incompressible
C. very viscous
D. one which obeys Newton's law of viscosity
28.The unit of kinematic viscosity is
A. gm/cm-sec2
B. dyne-sec/cm2
C. gm/cm2-sec
D. gm/cm-sec2
29.If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is
A. 0.25
B. 0.50
C. 1.0
D. 0.25
30. The viscosity of a gas
A. decreases with increase in temperature
B. increases with increase in temperature
C. is independent of temperature
D. decreases with increase in temperature
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