Food Tests Quiz

Why is distilled water used in food tests?

• It contains minerals

• It is pure H₂O with no other substances

• It adds flavor to the food

• It is cheaper than tap water

What color does a food sample turn if it contains sugar when Benedict’s solution is added and heated?

• Blue

• Orange-red

• Purple

• Black

Which type of carbohydrate requires a test with iodine?

• Sugars

• Starch

• Proteins

• Fats

Why are different tests needed for starch and sugars?

• They are different types of carbohydrates

• They have the same chemical structure

• They react the same way

• They are both proteins

What colour change shows us sugar is present?

• Green to yellow

• Red to blue

• Blue to orange-red

• Purple to pink

What is the test called that is used for detecting protein in a food sample?

• Benedict's test

• Biuret test

• Iodine test

• Litmus test

What colour appears if there is protein in the food sample during the Biuret test?

• Blue

• Green

• Purple

• Red

Which chemical is added first in the Biuret test for protein?

• Sodium hydroxide solution

• Dilute copper sulphate solution

• Iodine solution

• Benedict's solution

Which chemical is added second in the Biuret test for protein?

• Sodium hydroxide solution

• Dilute copper sulphate solution

• Iodine solution

• Benedict's solution

What is the purpose of the Biuret test?

• To test for carbohydrates

• To test for proteins

• To test for fats

• To test for vitamins