Question

Statement 1: Glass packed food might be spoiled by light.

Statement 2: When canned foods with vacuum are taking onto flights, they _____

(a) True, contract

(b) True, expand

(c) False, contract

(d) False, expand

This question was addressed to me in class test.

This interesting question is from Principles of Food Preservation by Canning-5 in chapter Principles of Food Preservation by Canning and Drying and Principles of Food Concentrates of Food Engineering

Answer 1

Right option is (b) True, expand

The explanation: Glass packed food might be spoiled by light. When canned foods with vacuum are taking onto flights, they expand. This is because the pressure at high altitude that the flight tales off too is very low and inside the can is higher than outside and hence the bloating.