Explore topic-wise MCQs in Fluid Mechanics.

This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Fluid Mechanics knowledge and support exam preparation. Choose a topic below to get started.

1.

For a streamlined body to achieve low drag coefficient, the boundary layer must_________

A. Flow over the body
B. Be attached to the body
C. Move away from the body
D. Move parallel to the body
Answer» C. Move away from the body
Discussion
2.

Drag coefficient is a function of _________

A. Mach number
B. Froude’s number
C. Laminar flow
D. Reynolds number
Answer» B. Froude’s number
Discussion
3.

The efficiency of the vane is given by_________

A. 1-V22 / V12
B. 1-(V22 / V12)
C. V22 / V12
D. 1- V12
Answer» B. 1-(V22 / V12)
Discussion
4.

Drag force can exist between two layers of liquid.

A. True
B. False
Answer» B. False
Discussion
5.

Drag force is directly proportional to ________

A. Density of fluid
B. Mass density
C. Area
D. Flow speed
Answer» B. Mass density
Discussion
6.

DRAG_FORCE_CAN_EXIST_BETWEEN_TWO_LAYERS_OF_LIQUID.?$

A. True
B. False
Answer» B. False
Discussion
7.

Drag coefficient is a function of _________$

A. Mach number
B. Froude’s number
C. Laminar flow
D. Reynolds number
Answer» B. Froude‚Äö√Ñ√∂‚àö√ë‚àö¬•s number
Discussion
8.

The_efficiency_of_the_vane_is_given_by_________$

A. 1-V<sub>2</sub><sup>2</sup> / V<sub>1</sub><sup>2</sup>
B. 1-(V<sub>2</sub><sup>2</sup> / V<sub>1</sub><sup>2</sup>)
C. V<sub>2</sub><sup>2</sup> / V<sub>1</sub><sup>2</sup>
D. 1- V<sub>1</sub><sup>2</sup>
Answer» B. 1-(V<sub>2</sub><sup>2</sup> / V<sub>1</sub><sup>2</sup>)
Discussion
9.

With the decrease in the viscosity, Reynolds number ________

A. Increases
B. Decreases
C. Same
D. Independent
Answer» B. Decreases
Discussion
10.

With the increase in flow velocity, Reynolds number_________

A. Increases
B. Decreases
C. Same
D. Independent
Answer» B. Decreases
Discussion
11.

There will be a transition from laminar flow to turbulent flow when______

A. Reynolds number increases
B. Reynolds number decreases
C. Reynolds number is the same
D. Froude’s number increases
Answer» B. Reynolds number decreases
Discussion
12.

For_a_streamlined_body_to_achieve_low_drag_coefficient,_the_boundary_layer_must_________

A. Flow over the body
B. Be attached to the body
C. Move away from the body
D. Move parallel to the body
Answer» C. Move away from the body
Discussion
13.

Drag force is directly proportional to _______?

A. Density of fluid
B. Mass density
C. Area
D. Flow speed
Answer» B. Mass density
Discussion
14.

If the friction is neglected, then_______

A. V<sub>r1</sub> > V<sub>r2</sub>
B. V<sub>r1</sub> < V<sub>r2</sub>
C. V<sub>r1</sub> = V<sub>r2</sub>
D. V<sub>r1</sub> is a zero
Answer» D. V<sub>r1</sub> is a zero
Discussion
15.

The drag coefficient is directly proportional to the ___________

A. Drag force
B. Mass density
C. Area
D. Flow speed
Answer» B. Mass density
Discussion
16.

The drag coefficient of a complete structure such as an aircraft includes________

A. Form drag
B. Pressure drag
C. Interference drag
D. Induced drag
Answer» D. Induced drag
Discussion
17.

Drag coefficient is denotes as_______

A. C<sub>d</sub>
B. B<sub>c</sub>
C. D<sub>c</sub>
D. T<sub>c</sub>
Answer» B. B<sub>c</sub>
Discussion
18.

Bodies with a larger cross section will have________

A. Lower drag
B. Higher drag
C. Same drag
D. No drag
Answer» C. Same drag
Discussion
19.

Skin friction acts on the component of _________

A. Profile drag
B. Surface blade
C. Vane angles
D. Parallel movement
Answer» B. Surface blade
Discussion
20.

What is the dimension for drag coefficient?

A. Newton/s
B. m/s
C. kg/N
D. Dimensionless
Answer» E.
Discussion