Question

When a gas is pushed through a pipe, the gaseous molecules are _________ by the pipe’s walls

(a) Attracted

(b) Absorbed

(c) Deflected

(d) Dissipated

The question was posed to me by my college professor while I was bunking the class.

My query is from Flow through Nozzles in chapter Flow Through Pipes of Fluid Mechanics

Answer 1

Right answer is (c) Deflected

To explain I would say: This is because there is no attractive force present in the tube for the process of attraction to occur. Also, the surface of pipes is not an absorbing one, hence absorption is also ruled out. A pipe is not capable of dissipation of the molecules. Hence, the right option is deflected.