A) conservation of mass, energy and momentum
B) conservation of mass
C) conservation of momentum
D) conservation of energy
Correct Answer: D
Solution :
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 \[P+\frac{1}{2}\rho {{v}^{2}}+\rho gh=\text{constant}\] where P is pressure, p is density, v is velocity, g is gravity and \[h\]is height. Thus, Bernoullis theorem is one way the principle of conservation of energy for a flowing liquid (or gas).
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