CFS Food Packaging & Shelf Life 3

Question 1

What is the critical water activity level below which most mold species cannot grow?

Accepted Answer

0.80

Answer

0.95

Answer

0.91

Answer

0.60

Question 2

What does MVTR stand for and why is it significant in packaging science?

Accepted Answer

Moisture Vapor Transmission Rate; it measures water vapor permeability through packaging

Answer

Maximum Vapor Transmission Rating; it limits legal moisture ingress

Answer

Material Viscosity Testing Ratio; it assesses polymer flow

Answer

Minimum Viable Temperature Range; it sets cold chain thresholds

Question 3

Ultra-high temperature (UHT) milk is most commonly packaged in which type of container to achieve room-temperature shelf stability?

Accepted Answer

Aseptic multilayer paperboard cartons (e.g., Tetra Pak)

Answer

Glass bottles with vacuum seals

Answer

Retort pouches with metal foil layers

Answer

Modified atmosphere rigid trays

Question 4

Intelligent packaging differs from active packaging primarily in that it:

Accepted Answer

Monitors and communicates information about product condition or history

Answer

Contains antimicrobial agents that reduce microbial load

Answer

Actively removes oxygen from the headspace

Answer

Uses multiple high-barrier polymer layers

Question 5

Which thermal packaging concept uses phase-change materials (PCMs) to maintain cold chain temperature during distribution?

Accepted Answer

Insulated passive packaging with PCMs

Answer

Retort packaging

Answer

Modified atmosphere packaging

Answer

Vacuum skin packaging

Question 6

The 'first in, first out' (FIFO) inventory principle in food packaging operations is most important for:

Accepted Answer

Ensuring older products are sold before newer ones to prevent shelf life expiration

Answer

Maximizing packaging material usage per production run

Answer

Reducing packaging line changeover and cleaning time

Answer

Improving heat seal integrity on flexible packaging

Question 7

When designing packaging for a low-acid food (pH > 4.6) intended to be shelf-stable at room temperature, which preservation approach is required?

Accepted Answer

Commercial sterilization achieving a 12-log reduction of Clostridium botulinum

Answer

Refrigeration combined with a high-barrier film

Answer

Water activity reduction below 0.60 through drying

Answer

High-oxygen MAP with antimicrobial sachets