Question

The speed of efflux, in case of a tank with a hole at the bottom, depends upon which of the following factors? Assume that the area of the tank is > > area of hole.

(a) area of tank

(b) density of liquid

(c) height of hole from liquid

(d) atmospheric pressure value

This question was posed to me during an online exam.

This interesting question is from Fluids Mechanical Properties topic in portion Mechanical Properties of Fluids of Physics – Class 11

Answer 1

The correct option is (c) height of hole from liquid

The explanation: Given that the area of the tank is > > area of hole, we can use the formula v = \(\sqrt{2gh}\). This shows that speed depends only on acceleration due to gravity and height of hole from the surface.