# How Well You Know About Fluid Mechanics? Trivia Quiz

20 Questions | Total Attempts: 8193  Settings  How well do you know about fluid mechanics? Fluid mechanics is the branch of physics concerned with the processing of fluid. It is the function of the laws of force and motion to fluids, liquids, and gases. Both liquids and gases are considered fluids for the aim of this branch of science. Fluid mechanics involves a substantial understanding of complex mathematics. Remember to get your certificate once you have completed this quiz.

• 1.
A fluid flows steadily through a pipe with a uniform cross-section area. The density ρ of the fluid decreases to half its initial value as it flows through the pipe. Choose the letter of the correct statement about the average velocity V.
• A.

V2 equals 2 V1

• B.

V2 equals V1/2

• C.

V2 equals V1

• D.

V2 equals V1/4

• E.

V2 equals 4 V1

• 2.
Water flows through a pipe and enters a section where the cross-sectional area is smaller. Viscosity, friction, and gravitational effects are negligible. Choose the letter of the correct statement about the change in pressure p and average velocity V.
• A.

P2 is less than P1 and V2 is less than V1

• B.

P2 is less than P1 and V2 is greater than V1

• C.

P2 is greater than P1 and V2 is less than V1

• D.

P2 is greater than P1 and V2 is greater than V1

• 3.
Two fluid jets are pointed at surfaces as shown in the figures below. The fluids are incompressible, and the effects of gravity can be neglected. The mass flow rate and the velocity of the jets are identical. The cross-section area of the jets does not change significantly as the fluid flows. Choose the letter of the correct statement regarding the horizontal forces.
• A.

F1 equals 2 F2

• B.

F1 is greater than 0 and F2 equals 0

• C.

F1 equals F2/2

• D.

F1 equals 0 and F2is greater than 0

• E.

F1 equals F2

• 4.
Choose the correct statement about pressure in a fluid.
• A.

Pressure is a body force.

• B.

Pressure acts normal to a surface.

• C.

Pressure is a frictional force.

• D.

Pressure acts parallel to a surface.

• 5.
A layer of water is between a stationary surface and a moving plate as shown in two figures below. The plate velocities in each figure are the same. The water in the second figure is twice as deep as the water layer in the first figure. The water layer is laminar. Choose the letter of the correct statement about the forces.
• A.

F1 equals 2 F2

• B.

F1 equals 4 F2

• C.

F1 equals F2/2

• D.

F1 equals F2/4

• E.

F1 equals F2

• 6.
Water flows through two smooth pipes with the same diameter and length as shown below. The flow rate through the second pipe is twice that through the first pipe. Both flows are laminar and fully developed. Choose the letter of the statement that is correct about the pressure drop (pressure difference over the pipe length).
• A.

Pipe 1 has the higher pressure drop

• B.

Pipe 2 has the higher pressure drop

• C.

Pipes 1 and 2 have the same pressure drop

• D.

All of the above

• E.

None of the above

• 7.
Choose the correct statement about the shear stress in a flow field.
• A.

Shear stress is proportional to velocity

• B.

Shear stress is proportional to the square of velocity

• C.

Shear stress is proportional to the velocity gradient in the direction of flow

• D.

Shear stress is proportional to velocity gradient normal to the flow

• E.

Shear stress is proportional to the difference in velocity

• 8.
Water flows through a pipe and enters a section where the cross-sectional area is larger. Viscosity, friction, and gravitational effects are negligible. Choose the letter of the correct statement about the change in pressure p and average velocity V.
• A.

P2 is less than P1 and V2 is less than V1

• B.

P2 is less than P1 and V2 is greater than V1

• C.

P2 is greater than P1 and V2 is less than V1

• D.

P2 is greater than P1 and V2 is greater than V1

• 9.
Two very long plates, with a layer of water between them, are pulled in opposite directions as shown below. There is no imposed pressure gradient in the direction of flow and the velocities in the water are laminar and due only to the motion of the plate. Choose the letter that best represents the velocity profile (distribution of the velocity of the water with distance) inside the fluid.
• A.

Profile A

• B.

Profile B

• C.

Profile C

• D.

Profile D

• E.

None of the above

• 10.
Water flows vertically up through a pipe and enters a section where the cross-sectional area is smaller. Viscosity and pipe friction effects are negligible but gravitational effects are not negligible. Choose the letter of the correct statement about the pressure P2 and velocity V2.
• A.

P2 equals P1 and V2 equals V1

• B.

P2 is greater than P1 and the V2 is greater than V1

• C.

P2 is greater than P1 and the V2 is less than V1

• D.

P2 is less than P1 and the V2 is greater than V1

• E.

P2 is less than P1 and the V2 is less than V1

• 11.
Find the Reynolds number of a water flow at an average speed of 20ft/s at 60degee F in a 6 in. diameter pipe. If the Reynolds numbers is 2300, what is the maximum speed at which the flow will be in laminar.Take Kinematic viscosity as 1.21*10^-5 sq. ft/s
• A.

8.26*10^-5; 0.056 ft/s

• B.

8.26*10^5; 0.056 ft/s

• C.

8.26*10^-4; 0.56 ft/s

• D.

8.26*10^5; 0.56 ft/s

• E.

None of the above

• 12.
Power is ..........
• A.

Force times area

• B.

Work times area

• C.

Force per unit time

• D.

Work done per unit time

• E.

None of the above

• 13.
An inverted U-tube is connected across two pipes 1 and 2 carrying fluids as shown in Fig. Calculate the pressure difference between point 1 and 2 (at center of the pipes). Note: the values given in the bracket are sp. gravity of the fluids.
• A.

-932N/m

• B.

-932N/sq.m

• C.

932N/m

• D.

932N/sq.m

• E.

None of the above

• 14.
Value of Coefficient of discharge (Cd) for venturi meter
• A.

0.095 to 0.098

• B.

0.070 to 0.080

• C.

0.95 to 0.98

• D.

0.60 to 0.65

• E.

0.70 to 0.80

• 15.
• A.

Head loss across venturi meter is very high

• B.

Head loss across orifice meter is low

• C.

Head loss across Flow nozzle is intermediate

• D.

All the above are correct

• E.

All the above are wrong

• 16.
Fig. A:                                                            Fig. B:                    Fig. C:                                                              Fig. D:                       Fig. E:                                                              Fig. F:                      Fig. A, Fig. B, Fig. C, Fig. D, Fig. E and Fig. F represent some physical phenomenons. Choose the option of correct order.
• A.

Capillary rise, Impact of jet, Viscous effect, Surface tension, Buoyancy, Submerged body

• B.

Surface tension, Viscous effect, Impact of jet, Buoyancy, Submerged body, Capillary rise

• C.

Surface tension, Capillary rise, Viscous effect, Buoyancy, Impact of jet, Submerged body

• D.

Surface tension, Capillary rise, Density, Buoyancy, Submerged body, Impact of jet.

• E.

None of the options match

• 17.
What is co-efficient of discharge?
• A.

Product of Actual and Theoretical discharges

• B.

Sum of Actual and Theoretical discharges

• C.

Ratio between Actual and Theoretical discharges

• D.

Ratio between Theoretical and Actual discharges

• E.

None of the above

• 18.
A, B, C, D, E represent
• A.

Solid, Non-Newtonian Fluid, Plastic Fluid, Ideal Fluid, Newtonian Fluid

• B.

Solid, Plastic Fluid, Ideal Fluid, Newtonian Fluid, Non-Newtonian Fluid

• C.

Ideal Fluid, Solid, Plastic Fluid, Newtonian Fluid, Non-Newtonian Fluid

• D.

Solid, Plastic Fluid, Non-Newtonian Fluid, Newtonian Fluid, Ideal Fluid

• E.

Ideal Fluid, Newtonian Fluid, Plastic Fluid, Non-Newtonian Fluid, Solid

• 19.
Slim and Chubby persons weigh 70 and 140 kg. Area of their feet is 0.03 sq.m. find the normal stresses (approximate) on their feet.
• A.

20 kPa, 40 kPa

• B.

21 kPa, 42 kPa

• C.

23 kPa, 46 kPa

• D.

25 kPa, 50 kPa

• E.

50 kPa, 80 kPa

• 20.
A manometer is used to measure the pressure in a tank. The fluid used has a specific gravity of 0.85, and the manometer column height is 55 cm, as shown in Fig. If the local atm. pressure is 96kPa, determine the absolute pressure within the tank.
• A.

120.65 kPa

• B.

100.60 kPa

• C.

96.00 kPa

• D.

93.58 kPa

• E.

None of the above

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