Question

The working of venturimeter is based on
A) Torrcelli`s law
B) Pascal`s law
C) Bernoulli`s theorem
D) Archimede`s principle

Answer 1

Hint: The venture meters streem of estimation instruments which utilize a merging segment of channel to give an expansion in the stream velocity and a comparing pressure drop from which the flow rate can be found. In simple words it works on the principle of when velocity increases then pressure is decreased.

Complete answer:
Venturimeter is a device used to measure the speed and flow rate or discharge of fluid through a pipe. And it works on the principle of Bernoulli's equation, which expresses that the distinction in pressure made over the hindrance it gives proportion of the liquid stream rate is relative to the square base of the differential pressure.
When cross sectional area of the flow is reduce it creates pressure difference between the different area of flow. This device comprises a straight channel area, a uniting cone shaped gulf segment gulf segment a tube shaped throat and veering clone like outlet segment. The throat area is of a little cross segment and it gives tightening to the liquid. The contraction influences stream velocity and liquid pressure to drop. There is a different tap for low pressure and high pressure separately and the distinction in pressure among both taps is the proportion of stream rate.

Hence the correct answer is option C.

Additional information:
Bernoulli's principle defined as increasing in the speed of a fluid occurs simultaneously decreasing in a static pressure or decreasing in fluid's potential energy.
Bernoulli's theorem was first derived by the swiss mathematician Daniel Bernoulli in 1738.

Note:
As per the guideline of mass coherence in the liquid elements there is incompressible liquid velocity that must increase as it goes through a height. Its static pressure must diminish according to the standard of protection of mechanical energy it is Bernoulli's rule.