Question: A flow is called sub-sonic, if the Mach number is
[A].

less than unity

[B].

unity

[C].

between 1 and 6

[D].

more than 6

Answer: Option A

Explanation:

No answer description available for this question.

Question: The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid)
[A].

K.ρ

[B].

K/ρ

[C].

ρ/K

[D].

K.ρ

Answer: Option B

Explanation:

No answer description available for this question.

Question: Bulk modulus of a fluid __________ as the pressure increases.
[A].

remains same

[B].

decreases

[C].

increases

Answer: Option C

Explanation:

No answer description available for this question.

Question: Bulk modulus of a fluid is the ratio of
[A].

shear stress to shear strain

[B].

increase in volume to the viscosity of fluid

[C].

increase in pressure to the volumetric strain

[D].

critical velocity to the viscosity of fluid

Answer: Option C

Explanation:

No answer description available for this question.

Question: A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Question: An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
[A].

equal to

[B].

directly proportional

[C].

inversely proportional

Answer: Option B

Explanation:

No answer description available for this question.

Question: An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)
[A].

tan θ = a/g

[B].

tan θ = 2 a/g

[C].

tan θ = a/2g

[D].

tan θ = a2/2g

Answer: Option A

Explanation:

No answer description available for this question.

Question: A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called
[A].

Pascal’s law

[B].

Archimede’s principle

[C].

D-Alembert’s principle

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Laminar flow __________ place at very low velocities.
[A].

takes

[B].

does not take

Answer: Option A

Explanation:

No answer description available for this question.

Question: A flow in which __________ force is dominating over the viscosity is called turbulent flow.
[A].

elastic

[B].

surface tension

[C].

viscous

[D].

inertia

Answer: Option D

Explanation:

No answer description available for this question.