Question

In deep freezers, the walls absorb heat from food materials by _____ and keep them cool.

(a) Conduction

(b) Convection

(c) Radiation

(d) None of the mentioned

I had been asked this question in a national level competition.

The above asked question is from Unit Operations topic in section Heat Transfer by Conduction, Convection and Radiation of Food Engineering

Answer 1

Right option is (c) Radiation

For explanation I would say: In deep freezers, the walls absorb heat from food materials by radiation and keep them cool.