Q1. ______ is a unique instrument for homogenizing food samples where they are sterilized within special sterilized plastic bags.

1. Homogenizer
2. Stomacher
3. Pulsifer
4. All of the above

ANSWER: B. Stomacher

• Explanation: The Stomacher is a one-of-a-kind device that homogenizes food samples. The sample is efficiently blended within special sterilized (non-reusable) plastic bags, obviating the requirement for disinfection and the usage of food processor (blender) cups. Such tools, in general, act on the bags similarly to the motions of our abdomen (stomach), hence the term “Stomacher.”

READ MORE – Food Science & Technology Quiz (05-01-2022)

Q2. _______ is a paddlewheel sort of blender used for the preparation of samples.

1. Blender
2. Pulsifer
3. Homogenizer
4. Stomacher

ANSWER: B. Pulsifer

• Explanation – Pulsifers are blenders with paddlewheels that are used to prepare samples. The device incorporates an oscillating ring opposing 3000 rpm paddlewheels, on which sterile plastic sample bags are put, resulting in a mixture of severe churning and shockwave that drives the microbes into suspension.

READ MORE – Food Science & Technology Quiz (15-01-2022)

Q3. ________ is very rapid and accurate for diagnosis of microbes in food (liquid) like milk via the use of Neubauer chamber (for counting) or Hemocytometer.

1. Standard plate count
2. Direct microscopic counts
3. MPN
4. Dye reduction test

ANSWER – B. Direct microscopic counts

• Explanation: Using a Neubauer chamber (for counting) or a hemocytometer, the Direct Microscopic Counts (DMC) approach is particularly fast and accurate for diagnosing bacteria in food (liquid) such as milk. This strategy necessitates prior experience. The food sample (properly diluted) is pipette (Pasteur) placed on the Haemocytometer and determined under the microscope in DMC. There are 25 big squares on the hemocytometer.

READ MORE – Food Science & Technology Quiz (25-01-2022)

Q4. ________ tests are extensively used for shelf-life prediction of food in food microbiology along with a diversity of microbial growth for the particular pathogen.

1. Dye reduction test
2. Electrical impedance
3. Resazurin test
4. C.O.B test

ANSWER: B. Electrical impedance

• Explanation: Electrical impedance tests are widely used in food microbiology for predicting food shelf life and a variety of microbial growth for a certain disease. When microorganisms grow in a broth/liquid media, they convert low conductivity substrates into higher conductivity products, lowering the impedance of the broth. Finally, as the number of cells increases, resistance diminishes. When the impedance of broth cultures is determined, the curvatures are repeatable for strains, species, and mixed cultures, which may be identified by utilizing specific growth inhibitors.

READ MORE – Food Science & Technology Quiz (05-12-2021)

Q5. _____ is a method of quick measurement of actively growing microbes through observation of ATP.

1. Dip slide
2. ATP test
3. Immunological methods
4. DNA microassay

ANSWER: B. ATP test

• Explanation – The ATP test is a means of quickly determining the number of actively developing microorganisms by observing ATP levels. Because ATP is the most significant energy source in all living beings, it is present within living cells and may be used to determine biological concentration and health. The amount of light created by its response with luciferase is calculated using a “Luminometer” in this experiment, and the quantity of produced light is directly proportional to the number of living microorganisms accessible in the samples.

READ MORE – Food Science & Technology Quiz (05-01-2022)

Connect with us on LinkedIn for future Job/Intern updates – Click Here