MCQ Questions and Answers on Fluid Mechanics

Q.

A floating body is said to be in stable equilibrium when

A. Metacenter lies above center of gravity of the body

B. Metacenter coincides with center of gravity of the body

C. Metacenter lies below the center of gravity of the body

D. None of the above

Discuss

Answer : Option:- A

Explanation :

A floating body is said to be in stable equilibrium when metacenter lies above center of gravity of the body.

Q.

A static fluid can have

A. Non-zero normal and shear stress

B. Negative normal stress and zero shear stress

C. Positive normal stress and zero shear stress

D. Zero normal stress and non-zero shear stress

Discuss

Answer : Option:- B

Explanation :

A static fluid can have negative normal stress and zero shear stress.

Q.

If a vessel containing liquid moves downward with constant acceleration(g) then

A. The pressure throughout the liquid mass is atmospheric

B. The pressure in the liquid mass is greater than the hydrostatic pressure

C. There will be vacuum in the liquid

D. The pressure throughout the liquid mass is greater than atmospheric

Discuss

Answer : Option:- A

Explanation :

The effective acceleration due to gravity will be (g−g = 0), hence, the pressure throughout the liquid mass will be atmospheric.

Q.

The ratio of gauge pressure within a spherical droplet and that in a bubble of the same fluid and same size will be

A. 1/4

B. 1/2

C. 1

D. 2

Discuss

Answer : Option:- D

Explanation :

We have,
P(droplet) = 4σ/R and
P(bubble) = 2σ/R
Thus we can write relation as,
P(droplet)/P(bubble) = 2

Q.

Navier–Stokes equation represents the conservation of

A. Energy

B. Mass

C. Pressure

D. Momentum

Discuss

Answer : Option:- D

Explanation :

Navier-Stokes equations include Newton’s second law to fluid motion, together with the assumption that the fluid stress is the sum of a diffusing viscous term plus a pressure term.

Q.

Due to which property of liquids, falling water drops become spherical, liquid jet breaks and soap bubbles are formed ?

A. Viscosity

B. Surface tension

C. Bulk modulus

D. All of the above

Discuss

Answer : Option:- B

Explanation :

Due to surface tension in liquids, falling water drops of become spherical, liquid jet breaks, and soap bubbles are formed.

Q.

What is the vertical component of pressure force on submerged curved surface equal to?

A. Its horizontal component.

B. The force on a vertical projection of the curved surface.

C. The product of the pressure at centroid and surface area.

D. The gravity force of liquid vertically above the curved surface up to the free surface.

Discuss

Answer : Option:- D

Explanation :

Vertical component of pressure force on submerged curved surface equal to The gravity force of liquid vertically above the curved surface up to the free surface..

Q.

The depth of center of pressure for a rectangular lamina immersed vertically in water up to height h is given by

A. H/2

B. H/4

C. 2h/3

D. 3h/2

Discuss

Answer : Option:- C

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

A stream line is a line

A. Which is along the path of the particle

B. Which is always parallel to the main direction of flow

C. Along which there is no flow

D. On which tangent drawn at any point gives the direction of velocity

Discuss

Answer : Option:- D

Explanation :

Stream line is an imaginary curve drawn through a flowing fluid in such a way that the tangent to it at any point gives the direction of velocity of flow at that point.

Q.

The stream lines and the lines of constant velocity potential in an inviscid rotational flow field form

A. Parallel grid lines placed in accordance with their magnitude

B. Intersecting grid net with arbitrary orientation

C. An orthogonal grid system

D. None of the above

Discuss

Answer : Option:- C

Explanation :

Stream lines and potential lines are orthogonal to each othe

MCQ Questions and Answers on Fluid Mechanics

Q. A floating body is said to be in stable equilibrium when

Q. A static fluid can have

Q. If a vessel containing liquid moves downward with constant acceleration(g) then

Q. The ratio of gauge pressure within a spherical droplet and that in a bubble of the same fluid and same size will be

Q. Navier–Stokes equation represents the conservation of

Q. Due to which property of liquids, falling water drops become spherical, liquid jet breaks and soap bubbles are formed ?

Q. What is the vertical component of pressure force on submerged curved surface equal to?

Q. The depth of center of pressure for a rectangular lamina immersed vertically in water up to height h is given by

Q. A stream line is a line

Q. The stream lines and the lines of constant velocity potential in an inviscid rotational flow field form

Q.

A floating body is said to be in stable equilibrium when

Q.

A static fluid can have

Q.

If a vessel containing liquid moves downward with constant acceleration(g) then

Q.

The ratio of gauge pressure within a spherical droplet and that in a bubble of the same fluid and same size will be

Q.

Navier–Stokes equation represents the conservation of

Q.

Due to which property of liquids, falling water drops become spherical, liquid jet breaks and soap bubbles are formed ?

Q.

What is the vertical component of pressure force on submerged curved surface equal to?

Q.

The depth of center of pressure for a rectangular lamina immersed vertically in water up to height h is given by

Q.

A stream line is a line

Q.

The stream lines and the lines of constant velocity potential in an inviscid rotational flow field form