This set of Food Packaging Technology Multiple Choice Questions & Answers (MCQs) focuses on “Food Packaging Materials – 2”.
1. The headspace maintained in wine bottles is around _______
a) 10mm
b) 20mm
c) 15mm
d) 25mm
View Answer
Explanation: The headspace maintained in wine bottles is around 15mm. Headspace is the space between cap of the bottle and the food product. Headspace is essential to avoid spilling while opening.
2. Wine can be packed in transparent glass bottles.
a) True
b) False
View Answer
Explanation: The given statement is false. Wine should always be packed in colored or tinted glass bottles (generally dark green/ brown). Exposure to sunlight makes it more susceptible to oxidation, hence resulting in a dull, flat, oxidized flavor.
3. The filler gas used in wine cans is _______
a) O2
b) He
c) CO2
d) N2
View Answer
Explanation: The filler gas used in wine cans is N2. It is necessary to increase the internal pressure in the cans to prevent collapse. Internal pressure is approximately 170kPa.
4. Wine can be packed in a fiberboard box.
a) True
b) False
View Answer
Explanation: The given statement is true. Wine can be packed in a fiberboard box, which is laminated (internally) by PVdC copolymer-coated PA-LDPE laminate. It is also known as a Bag-in-Box (BIB) package.
5. Which of the following is used for microwave ovenable trays?
a) PVC
b) HDPE
c) PET
d) PS
View Answer
Explanation: PET (Polyethylene Terephthalate) is used for microwave ovenable trays. It is also used for “boil‐in‐the‐bag” products which are frozen before use. It has a oriented crystalline structure (35-45% crystallinity), making it stable upto 140-160°C.
6. Which of the following plastic polymer is used for chips packaging?
a) PVDC
b) PP
c) PE
d) LDPE
View Answer
Explanation: PVDC- Polyvinyldiene Chloride has excellent water vapor and gas barrier properties. Not only this, its heat sealing characteristics and resistance to oils & fats makes it an ideal choice to pack chips.
7. Which of the following plastic polymers is used for packaging of fresh produce?
a) Dextrose
b) PS
c) PVdC
d) LDPE
View Answer
Explanation: PS – Polystyrene has very high vapor and gas transmission rate – hence, making it a breathable film. However, it is not suitable for heat sterilization and deteriorates on exposure to sunlight. This film is crystal clear and sparkling, enabling consumers to see through it.
8. R-enamel is used for high acidic foods.
a) True
b) False
View Answer
Explanation: The given statement is true. R-enamel stands for Regular enamel. It includes – phenolic resin or epoxy phenolic coating (resole phenolic) with BPA epoxy and H3PO4 catalyst.
9. Purple staining is related to a defect in which packaging?
a) PET bottles
b) Glass bottles
c) Metal cans
d) Paperboard
View Answer
Explanation: Purple staining is observed in metal cans. This defect refers to the blackening of inner side of can. It occurs when sulphur containing food reacts with iron in the can to form purple iron sulphide.
10. Which of the following is most widely for packaging raw fruits & vegetables?
a) PVC
b) OPP
c) BOPP
d) LLDPE
View Answer
Explanation: Blend of polyolefilms –mainly LLDPE is used for packaging raw fruits & vegetables . Film contains pigments to protect it from sunlight. LLDPE is stretchable and transparent, enabling consumers to look into the packet.
11. Which of the following materials is most suitable for the packaging of pre-processed vegetables?
a) HDPE, LLDPE, PVC
b) PVdC, OPP, HDPE
c) OPP, LDPE, LLDPE
d) PS, BOPP, HDPE
View Answer
Explanation: Most suitable are polymeric blend of LLDPE, LDPE or OPP with EVA copolymer.
| Vegetable | Packging material and thickness |
|---|---|
| Peeled potato, both whole and sliced | LDPE, 50 μm |
| Grated carrot | OPP, 40 μm, microperforated LDPE-EVA-OPP, 30-40 μm |
| Sliced beetroot | LDPE, 50 μm |
| Grated beetroot | OPP, 40 μm, microperforated OPP,PE EVA-OPP 30-40 μm |
| Shredded white cabbage | OPP, 40 μm, LDPE-EVA-OPP, 30-40 μm |
| Shredded onion | OPP, 40 μm |
12. Twist wrapping is used in which of the following products?
a) Biscuit
b) Toffees
c) Bread
d) Cookies
View Answer
Explanation: Twist wrapping is used in packaging of toffees. Twist wrapping includes cutting a piece of packaging film, rolling and forming it to a tube around the object and twisting the ends of the tube.
13. Which of the following is used in packaging whole milk powder?
a) Aluminium+ polyethylene
b) Aluminium+ polystyrene
c) Aluminium+ PVC
d) Aluminium+ PET
View Answer
Explanation: Aluminium foil + polyethylene is widely used for retail packs. Whole milk powder requires vacuum or gas packing to prevent oxidation of fat. Vacuum packaging in oxygen impermeable flexible film laminates is better than tin containers with inert gas for whole milk powder in terms of shelf life and quality.
14. Which of the following products can be vacuum packed?
a) Cookies
b) Walnuts
c) Crackers
d) Milk
View Answer
Explanation: Walnuts can be vacuum packed. Cookies and crackers are packed without any filler gas because it is a non-perishable product. Milk is directly packed after pasteurization as it is a perishable product.
15. Which of the following is used as C enamel on cans?
a) ZnO
b) PbS
c) NaOH
d) H2S
View Answer
Explanation: ZnO (Zinc Oxide) is a C-enamel used on cans. C-enamels is used for coating the internal surface of low acid, high sulphur foods to prevent discoloration or erosion.
Sanfoundry Global Education & Learning Series – Food Packaging Technology.
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