1000+ Fluid Mechanics MCQ for LIC ADO [Solved]
Thursday 9th of March 2023
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1. The value of mass density in kg-sec-V-m? for water at 0°C is
A. 1
B. 1000
C. 100
D. 101.9
Answer : D
A. 1
B. 1000
C. 100
D. 101.9
Answer : D
2. The specific weight of water is 1000 kg/m3
A. At normal pressure of 760 mm
B. At 4°C temperature
C. At mean sea level
D. All the above
Answer : D
A. At normal pressure of 760 mm
B. At 4°C temperature
C. At mean sea level
D. All the above
Answer : D
3. The total head of a liquid particle in motion is equal to
A. Pressure head + kinetic head + potential head
B. Pressure head - (kinetic head + potential head)
C. Potential head - (pressure head + kinetic head)
D. Kinetic head - (pressure head + potential head)
Answer : A
A. Pressure head + kinetic head + potential head
B. Pressure head - (kinetic head + potential head)
C. Potential head - (pressure head + kinetic head)
D. Kinetic head - (pressure head + potential head)
Answer : A
4. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
A. Narrow-crested weir
B. Broad-crested weir
C. Ogee weir
D. Submerged weir
Answer : D
A. Narrow-crested weir
B. Broad-crested weir
C. Ogee weir
D. Submerged weir
Answer : D
5. In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
A. Less than
B. More than
C. Equal to
D. None of these
Answer : A
A. Less than
B. More than
C. Equal to
D. None of these
Answer : A
6. If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be
A. h
B. wh
C. w/h
D. h/w
Answer : B
A. h
B. wh
C. w/h
D. h/w
Answer : B
7. Hot wire anemometer is used to measure
A. Pressure in gases
B. Liquid discharge
C. Pressure in liquids
D. Gas velocities
Answer : D
A. Pressure in gases
B. Liquid discharge
C. Pressure in liquids
D. Gas velocities
Answer : D
8. An orifice is said to be large, if
A. The size of orifice is large
B. The velocity of flow is large
C. The available head of liquid is more than 5 times the height of orifice
D. The available head of liquid is less than 5 times the height of orifice
Answer : D
A. The size of orifice is large
B. The velocity of flow is large
C. The available head of liquid is more than 5 times the height of orifice
D. The available head of liquid is less than 5 times the height of orifice
Answer : D
9. The top of the weir over which the water flows is known as
A. Sill or crest
B. Nappe or vein
C. Orifice
D. None of these
Answer : A
A. Sill or crest
B. Nappe or vein
C. Orifice
D. None of these
Answer : A
10. Center of pressure compared to e.g. is
A. Above it
B. Below it
C. At same point
D. Above or below depending on area of body
Answer : B
A. Above it
B. Below it
C. At same point
D. Above or below depending on area of body
Answer : B
11. The continuity equation is connected with
A. Open channel/pipe flow
B. Compressibility of fluids
C. Conservation of mass
D. Steady/unsteady flow
Answer : C
A. Open channel/pipe flow
B. Compressibility of fluids
C. Conservation of mass
D. Steady/unsteady flow
Answer : C
12. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?
A. The pressure on the wall at the liquid level is minimum
B. The pressure on the bottom of the wall is maximum
C. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
D. The pressure on the bottom of the wall is zer
Answer : C
A. The pressure on the wall at the liquid level is minimum
B. The pressure on the bottom of the wall is maximum
C. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
D. The pressure on the bottom of the wall is zer
Answer : C
13. The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.
A. One-half
B. One-third
C. Two-third
D. None of these
Answer : B
A. One-half
B. One-third
C. Two-third
D. None of these
Answer : B
14. The velocity corresponding to Reynold number of 2000 is called
A. Sub-sonic velocity
B. Super-sonic velocity
C. Lower critical velocity
D. Higher critical velocity
Answer : C
A. Sub-sonic velocity
B. Super-sonic velocity
C. Lower critical velocity
D. Higher critical velocity
Answer : C
15. To avoid an interruption in the flow of a siphon, an air vessel is provided
A. At the inlet
B. At the outlet
C. At the summit
D. At any point between inlet and outlet
Answer : C
A. At the inlet
B. At the outlet
C. At the summit
D. At any point between inlet and outlet
Answer : C
16. The ratio of the inertia force to the elastic force is called
A. Reynold's number
B. Froude's number
C. Weber's number
D. Mach number
Answer : D
A. Reynold's number
B. Froude's number
C. Weber's number
D. Mach number
Answer : D
17. A flow whose streamline is represented by a curve, is called
A. One-dimensional flow
B. Two-dimensional flow
C. Three-dimensional flow
D. Four-dimensional flow
Answer : B
A. One-dimensional flow
B. Two-dimensional flow
C. Three-dimensional flow
D. Four-dimensional flow
Answer : B
18. A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.
A. Incompressible
B. Compressible
C. Viscous
D. None of these
Answer : A
A. Incompressible
B. Compressible
C. Viscous
D. None of these
Answer : A
19. For pipes, turbulent flow occurs when Reynolds number is
A. Less than 2000
B. Between 2000 and 4000
C. More than 4000
D. Less than 4000
Answer : C
A. Less than 2000
B. Between 2000 and 4000
C. More than 4000
D. Less than 4000
Answer : C
20. 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. A2/3 × M1/3 × m × i
Answer : B
A. A × M × m1/2 × i2/3
B. A × M × m2/3 × i1/2
C. A1/2 × M2/3 × m × i
D. A2/3 × M1/3 × m × i
Answer : B
21. The flow in which each liquid particle has a definite path and their paths do not cross each other is called
A. One dimensional flow
B. Streamline flow
C. Steady flow
D. Turbulent flow
Answer : B
A. One dimensional flow
B. Streamline flow
C. Steady flow
D. Turbulent flow
Answer : B
22. If the depth of water in an open channel is less than the critical depth, the flow is called
A. Critical flow
B. Turbulent flow
C. Tranquil flow
D. Torrential flow
Answer : D
A. Critical flow
B. Turbulent flow
C. Tranquil flow
D. Torrential flow
Answer : D
23. When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface.
A. Concave
B. Convex
C. Plane
D. None of these
Answer : A
A. Concave
B. Convex
C. Plane
D. None of these
Answer : A
24. The flow in which conditions do not change with time at any point, is known as
A. One dimensional flow
B. Uniform flow
C. Steady flow
D. Turbulent flow
Answer : C
A. One dimensional flow
B. Uniform flow
C. Steady flow
D. Turbulent flow
Answer : C
25. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
A. Surface tension
B. Compressibility
C. Capillarity
D. Viscosity
Answer : D
A. Surface tension
B. Compressibility
C. Capillarity
D. Viscosity
Answer : D
26. An ideal flow of any fluid must satisfy
A. Pascal law
B. Newton's law of viscosity
C. Boundary layer theory
D. Continuity equation
Answer : D
A. Pascal law
B. Newton's law of viscosity
C. Boundary layer theory
D. Continuity equation
Answer : D
27. Euler's equation in the differential form for the motion of liquids is given by
A. dp/? + g.dz + v.dv = 0
B. dp/? - g.dz + v.dv = 0
C. ?.dp + g.dz + v.dv = 0
D. ?.dp - g.dz + v.dv = 0
Answer : A
A. dp/? + g.dz + v.dv = 0
B. dp/? - g.dz + v.dv = 0
C. ?.dp + g.dz + v.dv = 0
D. ?.dp - g.dz + v.dv = 0
Answer : A
28. Differential manometer is used to measure
A. Pressure in pipes, channels etc.
B. Atmospheric pressure
C. Very low pressure
D. Difference of pressure between two points
Answer : D
A. Pressure in pipes, channels etc.
B. Atmospheric pressure
C. Very low pressure
D. Difference of pressure between two points
Answer : D
29. The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called
A. Up-thrust
B. Reaction
C. Buoyancy
D. Metacentre
Answer : C
A. Up-thrust
B. Reaction
C. Buoyancy
D. Metacentre
Answer : C
30. The upper surface of a weir over which water flows is known is
A. Crest
B. Nappy
C. Sill
D. Weir top
Answer : C
A. Crest
B. Nappy
C. Sill
D. Weir top
Answer : C
31. In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
A. Equal to
B. One-fourth
C. One-third
D. One-half
Answer : B
A. Equal to
B. One-fourth
C. One-third
D. One-half
Answer : B
32. Steady flow occurs when
A. The direction and magnitude of the velocity at all points are identical
B. The velocity of successive fluid particles, at any point, is the same at successive periods of time
C. The magnitude and 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 patterns are identical in each plane
Answer : B
A. The direction and magnitude of the velocity at all points are identical
B. The velocity of successive fluid particles, at any point, is the same at successive periods of time
C. The magnitude and 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 patterns are identical in each plane
Answer : B
33. The mercury does not wet the glass. This is due to the property of the liquid known as
A. Cohesion
B. Adhesion
C. Viscosity
D. Surface tension
Answer : D
A. Cohesion
B. Adhesion
C. Viscosity
D. Surface tension
Answer : D
34. Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure.
A. Plus
B. Minus
C. Divide
D. Multiply
Answer : B
A. Plus
B. Minus
C. Divide
D. Multiply
Answer : B
35. A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury?
A. 0.5
B. 0.4
C. 0.515
D. 0.5
Answer : C
A. 0.5
B. 0.4
C. 0.515
D. 0.5
Answer : C
36. Density of water is maximum at
A. 0° C
B. 0° K
C. 4° C
D. 100° C
Answer : C
A. 0° C
B. 0° K
C. 4° C
D. 100° C
Answer : C
37. A pressure of 25 m of head of water is equal to
A. 25 kN/ m²
B. 245 kN/ m²
C. 2500 kN/m²
D. 2.5 kN/ m²
Answer : B
A. 25 kN/ m²
B. 245 kN/ m²
C. 2500 kN/m²
D. 2.5 kN/ m²
Answer : B
38. An error of 1% in measuring head over the crest of the notch (H) will produce an error of __________ in discharge over a triangular notch,
A. 1 %
B. 1.5 %
C. 2 %
D. 2.5 %
Answer : D
A. 1 %
B. 1.5 %
C. 2 %
D. 2.5 %
Answer : D
39. When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ? rad/s, then depth of parabola which the liquid assumes is
A. ?.r/2g
B. ?².r²/2g
C. ?.r/4g
D. ?².r²/4g
Answer : B
A. ?.r/2g
B. ?².r²/2g
C. ?.r/4g
D. ?².r²/4g
Answer : B
40. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is
A. 0.83
B. 0.6
C. 0.4
D. 0.3
Answer : B
A. 0.83
B. 0.6
C. 0.4
D. 0.3
Answer : B
41. The velocity of the liquid flowing through the divergent portion of a Venturimeter
A. Remains constant
B. Increases
C. Decreases
D. Depends upon mass of liquid
Answer : C
A. Remains constant
B. Increases
C. Decreases
D. Depends upon mass of liquid
Answer : C
42. Which of the following statement is wrong?
A. A flow whose streamline is represented by a curve is called two dimensional flow.
B. The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.
C. The length of divergent portion in a Venturimeter is equal to the convergent portion.
D. A pitot tube is used to measure the velocity of flow at the required point in a pipe.
Answer : C
A. A flow whose streamline is represented by a curve is called two dimensional flow.
B. The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.
C. The length of divergent portion in a Venturimeter is equal to the convergent portion.
D. A pitot tube is used to measure the velocity of flow at the required point in a pipe.
Answer : C
43. The bulk modulus of elasticity with increase in pressure
A. Increases
B. Decreases
C. Remain constant
D. Increases first up to certain limit and then decreases
Answer : A
A. Increases
B. Decreases
C. Remain constant
D. Increases first up to certain limit and then decreases
Answer : A
44. The property by virtue of which a liquid opposes relative motion between its different layers is called
A. Surface tension
B. Coefficient of viscosity
C. Viscosity
D. Osmosis
Answer : C
A. Surface tension
B. Coefficient of viscosity
C. Viscosity
D. Osmosis
Answer : C
45. The units of dynamic or absolute viscosity are
A. Metres² per sec
B. kg sec/meter
C. Newton-sec per meter
D. Newton-sec² per meter
Answer : C
A. Metres² per sec
B. kg sec/meter
C. Newton-sec per meter
D. Newton-sec² per meter
Answer : C
46. A structure used to dam up a stream or river over which the water flows is called
A. Orifice
B. Notch
C. Weir
D. Dam
Answer : C
A. Orifice
B. Notch
C. Weir
D. Dam
Answer : C
47. Select the correct statement
A. Local atmospheric pressure depends upon elevation of locality only
B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
C. Local atmospheric pressure is always below standard atmospheric pressure
D. A barometer reads the difference between local and standard atmospheric pressure
Answer : B
A. Local atmospheric pressure depends upon elevation of locality only
B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
C. Local atmospheric pressure is always below standard atmospheric pressure
D. A barometer reads the difference between local and standard atmospheric pressure
Answer : B
48. The rise of liquid along the walls of a revolving cylinder about the initial level is __________ the depression of the liquid at the axis of rotation.
A. Same as
B. Less than
C. More than
D. None of these
Answer : A
A. Same as
B. Less than
C. More than
D. None of these
Answer : A
49. Viscosity of water in comparison to mercury is
A. Higher
B. Lower
C. Same
D. Higher/lower depending on temperature
Answer : A
A. Higher
B. Lower
C. Same
D. Higher/lower depending on temperature
Answer : A
50. Choose the correct relationship
A. Specific gravity = gravity × density
B. Dynamic viscosity = kinematic viscosity × density
C. Gravity = specific gravity × density
D. Kinematic viscosity = dynamic viscosity × density
Answer : B
A. Specific gravity = gravity × density
B. Dynamic viscosity = kinematic viscosity × density
C. Gravity = specific gravity × density
D. Kinematic viscosity = dynamic viscosity × density
Answer : B
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