Question

Cohesive forces between ___________ is a principal of film formation.

(a) Inner membrane and cell wall

(b) Film and substrate

(c) Endocarp and mesocarp

(d) Polymer molecules

This question was addressed to me during an internship interview.

My doubt is from Edible, Biobased and Biodegradable Food Packaging Materials topic in chapter Edible, Biobased and Biodegradable Food Packaging Materials of Food Packaging Technology

Answer 1

The correct answer is (d) Polymer molecules

The explanation is: Cohesive forces between polymer molecules are a principle of film formation. It is responsible for the barrier properties of the film. It helps in decreasing the permeability and hence transmission rates of gases and water respectively.