# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 1

46.

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

 A. specific weight B. mass density C. specific gravity D. none of these

Explanation:

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47.

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

 A. Correct B. Incorrect

Explanation:

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48.

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

 A. The bodies A and B have equal stability B. The body A is more stable than body B C. The body B is more stable than body A D. The bodies A and B are unstable

Explanation:

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49.

In open channels, the specific energy is the

 A. total energy per unit discharge B. total energy measured with respect to the datum passing through the bottom of the channel C. total energy measured above the horizontal datum D. kinetic energy plotted above the free surface of water

Explanation:

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50.

The Bernoulli's equation is based on the assumption that

 A. there is no loss of energy of the liquid flowing B. the velocity of flow is uniform across any cross-section of the pipe C. no force except gravity acts on the fluid D. all of the above