Fluid Mechanics MCQ Questions & Answers

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Each section contains 100 MCQs on Fluid Mechanics .

In an incompressible flow of fluid, the fluid

A) Temperature remains constant B) Compressibility is greater than zero C) Density does not change with pressure & temperature D) Is frictionless

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

The dimension of kinematic viscosity is

A) ML^-2T^-1 B) L²T^-1 C) ML^-2T^-2 D) None of these

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Dimension of kinematic viscosity is

A) MLT^-1 B) L²T^-1 C) L²T D) L²T^-2

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10^-6 m²/s).

A) 24000 B) 24 C) 0.24 D) 0.44

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

A) < 1 B) 1 C) > 1 D) 2

Discuss

Answer & Solution

Answer: Option A

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The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is

A) $$\sqrt {\frac{{{\text{HW}}}}{\pi }} $$ B) $$\frac{{{\text{HW}}}}{{2{{\left( {{\text{H}} + {\text{W}}} \right)}^2}}}$$ C) $$\frac{{{\text{HW}}}}{{4{{\left( {{\text{H}} + {\text{W}}} \right)}^2}}}$$ D) $$\frac{{2{\text{HW}}}}{{\left( {{\text{H}} + {\text{W}}} \right)}}$$

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

For water, when the pressure increases, the viscosity

A) Also increases B) Decreases C) Remains constant D) First decreases, and then increases

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Answer & Solution

Answer: Option D

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Boundary layer thickness in laminar flow over a flat plate increases as (where, d = distance from the leading edge.)

A) $$\sqrt {\text{d}} $$ B) $${{\text{d}}^{\frac{1}{3}}}$$ C) d² D) $${{\text{d}}^{\frac{2}{3}}}$$

Discuss

Answer & Solution

Answer: Option A

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Boundary layer thickness in turbulent flow over a flat plate increases as (where, d = distance from the leading edge.)

A) $$\sqrt {\text{d}} $$ B) $${{\text{d}}^{\frac{2}{3}}}$$ C) $${{\text{d}}^{\frac{4}{5}}}$$ D) $${{\text{d}}^{\frac{1}{3}}}$$

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Steady flow occurs, when the

A) Conditions change steadily with time B) Conditions are the same at the adjacent points at any instant C) Conditions do not change with time at any point D) Rate of the velocity change is constant

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering