Question

Bernoullis theorem is based on:

• A. conservation of mass, energy and momentum
• B. conservation of mass
• C. conservation of momentum
• D. conservation of energy

Answer 1

Answer: (D)

Bernoullis theorem states that when an incompressible and non-viscous liquid (or gas) flows in stream-lined motion from one place to another, then at every point of its path the total energy per unit volume (pressure energy + kinetic energy + potential energy) is constant.
That is $P+\frac{1}{2}\rho v^2+\rho gh=$ constant
where $P$ is pressure, $p$ is density,
$v$ is velocity, $g$ is gravity and $h$ is height.
Thus, Bernoulis theorem is one way the principle of conservation of energy for a flowing liquid (or gas).