Milk Processing Quiz

What is the minimum temperature and time required for pasteurisation of milk?

• 60°C for 10 seconds

• 72°C for 15 seconds

• 80°C for 20 seconds

• 90°C for 30 seconds

Answer explanation

The correct choice for pasteurisation of milk is 72°C for 15 seconds, as it ensures the minimum temperature and time required for effective pasteurisation.

What is the purpose of homogenisation in milk processing?

• To heat the milk

• To cool the milk

• To evenly disperse fat globules

• To add flavor to the milk

Answer explanation

To evenly disperse fat globules

Which organization governs the composition of milk in Australia and New Zealand?

• World Health Organization

• Food Standards Australia New Zealand

• International Dairy Federation

• United Nations

Answer explanation

Food Standards Australia New Zealand governs the composition of milk in Australia and New Zealand.

What is the minimum fat content required for packaged full-fat milk under the Food Standards Australia New Zealand Code?

• 2.0%

• 3.2%

• 4.0%

• 5.0%

Answer explanation

The minimum fat content required for packaged full-fat milk under the Food Standards Australia New Zealand Code is 3.2%.

What process removes some or all of the cream to make reduced-fat, low-fat, or skim milk?

• Pasteurisation

• Homogenisation

• Centrifugal separation

• Ultrafiltration

Answer explanation

Centrifugal separation is the process that removes some or all of the cream to make reduced-fat, low-fat, or skim milk.

What does ultrafiltration in milk processing retain?

• Water and sugar

• Protein, fat globules, and calcium complexes

• Vitamins and minerals

• Lactose and enzymes

Answer explanation

Ultrafiltration in milk processing retains protein, fat globules, and calcium complexes, making it the correct choice.

What is the main purpose of reverse osmosis in milk processing?

• To remove all milk solids

• To hold back most of the milk solids and let only water pass through

• To remove lactose from the milk

• To adjust the fat content of the milk

Answer explanation

To hold back most of the milk solids and let only water pass through

What does ultra osmosis allow to pass through?

• Only water

• Only milk solids

• Both water and salt

• Only lactose

Answer explanation

Ultra osmosis allows both water and salt to pass through, making it different from other forms of osmosis.

What is the purpose of spray drying in milk processing?

• To remove lactose from milk

• To make powdered milk products

• To adjust the fat content of milk

• To remove vitamins and minerals from milk

Answer explanation

To make powdered milk products

What is permeate in the context of milk processing?

• A substance added to milk to enhance flavor

• A byproduct of milk that is discarded

• Elements that filter through during ultrafiltration

• A type of milk solid

Answer explanation

Permeate in the context of milk processing refers to the elements that filter through during ultrafiltration, separating from the milk components.