Hydraulic Fluid Mechanics MCQs

Question 1

Which of the following statement is correct ?

Accepted Answer

all of the above

Answer

Which of the following statement is correct ?

Answer

A flow in which the volume of the flowing liquid does not change, is called incompressible flow.

Answer

When the particles rotate about their own axes while flowing, the flow is said to be rotational flow.

Question 2

The specific weight of water in S.I. units is taken as

Accepted Answer

The specific weight of water in S.I. units is taken as

Answer

9.81 x 103 kN/m3

Answer

9.81 x 10-6 N/mm3

Answer

any one of these

Question 3

The power transmitted through the pipe is maximum when the head lost due to friction is equal to

Accepted Answer

one-third of the total supply head

Answer

one-fourth of the total supply head

Answer

two-third of the total supply head

Question 4

The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

Accepted Answer

1/2 depth

Answer

1/2 breadth

Answer

1/2 sloping side

Answer

1/4 (depth + breadth)

Question 5

For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

Accepted Answer

Bernoulli's equation

Answer

continuity equation

Answer

Pascal's law

Answer

Archimede's principle

Question 6

When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

Accepted Answer

1.84(L - 0.1nH)H3/2

Answer

1.84(L - nH)H2

Answer

1.84(L - 0.1nH)H5/2

Answer

1.84(L - nH)H3

Question 7

When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of

Accepted Answer

a paraboloid

Answer

a triangle

Answer

an ellipse

Answer

none of these

Question 8

When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called

Accepted Answer

positive gauge pressure

Answer

gauge pressure

Answer

absolute pressure

Answer

vacuum pressure

Question 9

When a body is placed over a liquid, it will sink down if

Accepted Answer

gravitational force is more than the upthrust of the liquid

Answer

gravitational force is equal to the upthrust of the liquid

Answer

gravitational force is less than the upthrust of the liquid

Answer

none of the above