Food Sample Testing Quiz no1

The first step in preparing a food sample for testing is to (a)  

• Add distilled water
• Break up food with a pestle and mor
• Filter solution using filter paper
• Stir with a glass rod

What is the purpose of adding distilled water to the food sample?

• To add flavor

• To dissolve impurities

• To ensure no impurities affect the results

• To change the color of the solution

What is the temperature of the water bath in Benedict’s test?

• 100°C

• 95°C

• 85°C

• 90°C

The initial color change in the iodine test if starch is present is (a)  

• Blue to green
• Browny-orange to black or blue-blac
• Yellow to red
• Green to blue

What is the purpose of using a funnel lined with filter paper in preparing a food sample?

• To add flavor

• To filter the solution

• To heat the sample

• To change the color

What is the color change for low concentrations of glucose in Benedict’s test?

• Blue to green

• Blue to yellow

• Blue to red

• Blue to black

What is the main purpose of Benedict’s test?

• To test for proteins

• To test for starch

• To test for reducing sugars

• To test for fats

What color change indicates the presence of protein in a solution?

• Pale blue to pink or purple

• Pale blue to green

• Pale blue to yellow

• Pale blue to red

In the Sudan III test, what indicates the presence of lipids?

• The mixture turns green

• The mixture separates into two layers

• The mixture becomes cloudy

• The mixture turns blue

What is the top layer color in the Sudan III test if lipids are present?

• Blue

• Green

• Red

• Yellow