Hydraulics and fluid mechanics MCQ with Answers

36) In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

Answer is:

less than

37) The weight per unit volume of a liquid at a standard temperature and pressure is called

Answer is:

specific weight

Explanation:

Weight density or specific weight is defined as the weight per unit volume of a liquid at a standard temperature and pressure. Weight density or specific weight is usually denoted by w. Weight density or specific weight is expressed in kN/m³ or N/m³ or N/mm³.

Mathematically, weight density or specific weight,
w = ρ.g

Note: For water, w = 9.81 kN/m³ = 9.81 x 10³ N/m³ = 9.81 x 10^-6N/mm³.

38) The centre of buoyancy is the centre of area of the immersed body.

Answer is:

Correct

39) The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

Answer is:

The body B is more stable than body A

40) In open channels, the specific energy is the

Answer is:

36) In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

less than

37) The weight per unit volume of a liquid at a standard temperature and pressure is called

specific weight

38) The centre of buoyancy is the centre of area of the immersed body.

Correct

39) The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

The body B is more stable than body A

40) In open channels, the specific energy is the

total energy measured with respect to the datum passing through the bottom of the channel