Question

Action of spray-gun is based on:
A. Bernoulli’s principle
B. Boyle’s law
C. Faraday’s Law
D. Archimedes’ principle

Answer 1

Hint: In this question, we need to comment on the principle of the working of the spray-gun. For this, we will use the basic definition of the Bernoulli’s principle, Boyle’s law, Faraday’s Law and Archimedes principle

Complete step by step answer:In a spray gun, when rubber is squeezed, the air is blown in the tube, then air is blown in the tube, which creates low pressure and high velocity. This leads to the pressure in the tube to be less than the atmospheric pressure; hence liquid rises up, and this rise of liquid is sprayed out of the nozzle due to air blowing.

According to the Bernoulli principle, an increase in the speed of the fluid occurs simultaneously with a decrease in static pressure; hence we can say the action of spray-gun is based on the Bernoulli’s principle

Option (A) is correct.

Note:Bernoulli’s principle states that an increase in the speed of the fluid occurs simultaneously with a decrease in static pressure or a decrease in fluid potential energy.
Boyle’s law states that the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and volume remain unchanged in a closed system.
Faraday’s law is related to the magnetic field, which states that the absolute value or magnitude of the circulation of the electric field E around a close loop is equal to the rate of change of the magnetic field in the loop.
Archimedes’ principle states the upward buyout force that is exerted on the body that is immersed in the fluid is equal to the weight of the fluid displaced by the body; this acts in an upward direction.