Question

Bernoulli's theorem is a consequence of

• A. conservation of mass
• B. conservation of energy
• C. conservation of linear momentum
• D. conservation of angular momentum

Answer 1

The correct option is B conservation of energy

Bernoulli's principle can be derived from the principle of conservation of energy.
It states that, in a steady flow, the sum of all forms of energy in a fluid along a streamline is the same at all points on that streamline. This requires that the sum of kinetic energy, potential energy and internal energy remains constant.
Thus, an increase in the speed of the fluid implying an increase in its kinetic energy occurs with simultaneous decrease in its potential energy (including the static pressure) and internal energy.