Q1. _________ is extracted from brown seaweeds

1. Carrageenan
2. Sodium alginate
3. Aspartame
4. Acesulphame

ANSWER: B. Sodium alginate

• Explanation: Sodium alginate (Phaeophyceae) is extracted from brown seaweeds. In alkaline conditions, alginic acid, the free acid form of alginate, is extracted from the seaweed, then precipitated and ion-exchanged (e.g. with potassium). Sodium alginate is the most often used alginate in food (E 401). Alginate is a polymer that dissolves in cold water. It does not need to be heated to hydrate.

READ MORE – Food Science & Technology Quiz (06-03-2022)

Q2. Which of the following is the strongest fiber?

1. Nanotube
2. Nano cell
3. Nanofiber
4. Nanocomposite

ANSWER: A. Nanotube

• Explanation – Single sheets of graphite with honeycomb structures are ‘wound’ into very long, thin tubes with a stable, strong, and flexible structure to make nanotubes. One nanotube is 10 to 100 times stronger than steel, making it the strongest fiber (per unit weight).

READ MORE – Food Science & Technology Quiz (16-03-2022)

Q3. Which of the following is most commonly used for microencapsulation in the food industry?

1. Spray dryer
2. Freeze dryer
3. Vibrational nozzle
4. Pan coating

ANSWER – A. Spray dryer

• Explanation: The oldest industrial method for creating small coated particles or tablets is pan coating. The coating solution is sprayed into the particles inside the pan, and the solvent is evaporated by flowing warm air, resulting in coated particles. In the food sector, spray drying is the most prevalent encapsulation process. It is both cost-effective and adaptable. It produces extremely small particles (usually less than 100 m), which are highly soluble.

READ MORE – Food Science & Technology Quiz (26-03-2022)

Q4. Which of the following nanolithography techniques employs a tightly focused beam of electrons scanned over the surface of a substrate?

1. Photolithography
2. X-ray lithography
3. E-beam lithography
4. Soft lithography

ANSWER:  A. Photolithography

• Explanation: Photolithography is the process of patterning a substrate using photon or particle beams that interact with the materials. It is commonly utilized in the production of integrated circuits (ICs). The technology of X-ray lithography is used to form transistors with tiny features. A geometric pattern is transferred from a mask to a light-sensitive chemical photoresist on the substrate using X-rays. Electron Beam Lithography scans the surface of a substrate with a closely concentrated beam of electrons.

READ MORE – Food Science & Technology Quiz (28-03-2022)

Q5. Which of the following are the essential prerequisites for the formation of ketonic rancidity?

1. Presence of molds
2. Presence of short-chain fatty acids in the medium
3. Low partial pressure of oxygen
4. All of the above

ANSWER: D. All of the above

• Explanation – When some moulds (mostly xerophiles) are grown on a substrate containing short-chain fatty acids, ketones, and secondary alcohols with one carbon atom less than the parent fatty acid are produced. Molds, low water activity, low partial pressure of oxygen, and the presence of short-chain fatty acids in the medium appear to be key requirements for the creation of ketonic rancidity.

READ MORE – Food Science & Technology Quiz (05-04-2022)

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