MHT CET 2023 Physics question

It is easier to spray water to which soap is added because addition of soap to water

(A)decreases surface tension of waterCorrect
(B)increases surface tension of water
(C)makes surface tension of water zero
(D)increases its density

Answer: (A)

Solution

Soap is a surface-active substance (surfactant) that reduces the surface tension of water. Spraying creates many small droplets and hence a large increase in surface area, which needs surface energy ; lower T means less work is needed, so spraying becomes

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-098141