Food Tests Quiz for KS4 Students

Which reagent is used in the Biuret test to detect proteins in a food sample?

• Benedict's solution

• Biuret solution

• Iodine solution

• Ethanol

What colour change indicates a positive result for starch when using iodine solution?

• Blue to green

• Blue-black

• Red to orange

• Purple to pink

Which food test involves heating the sample with Benedict's solution?

• Iodine test for starch

• Biuret test for proteins

• Benedict's test for sugars

• Emulsion test for fats

What is the initial colour of Benedict's solution before it reacts with reducing sugars?

• Blue

• Red

• Yellow

• Green

A positive result in the Biuret test for proteins is shown by which colour change?

• Blue to green

• Blue to purple

• Blue to orange

• Blue to red

Which test is used to detect the presence of fats in a food sample?

• Benedict's test

• Biuret test

• Emulsion test

• Iodine test

What is added to a food sample during the emulsion test for fats?

• Water and iodine solution

• Ethanol and water

• Benedict's solution and heat

• Biuret solution

What observation indicates a positive result in the emulsion test for fats?

• Blue-black colour

• Brick-red precipitate

• Purple solution

• Cloudy white emulsion

Which of the following is NOT detected by Benedict's solution?

• Glucose

• Sucrose (without hydrolysis)

• Maltose

• Fructose

What is the correct sequence of steps for the iodine test for starch?

• Add iodine solution directly to the food sample

• Add ethanol, then iodine solution

• Heat with Benedict's solution, then add iodine

• Add Biuret solution, then iodine