Science General · Chemistry

Food Processing and Storage

2,542 Questions

Food processing and storage principles focus on preservation techniques, packaging methods, and preventing microbial contamination. These topics are essential for general science sections in various competitive examinations. Questions explore pasteurization, canning, chemical preservation, and safe food handling practices.

Food preservation methodsPasteurization techniquesFood packaging materialsMicrobial contamination preventionCryopreservation concepts

Food Processing and Storage Questions

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Which of the following are commonly used as food preservatives?

  1. Boric acid and zinc phosphide

  2. Bleaching powder and chlorine compounds

  3. 2, 4-D and zinc phosphide

  4. Sodium benzoate and sodium metabisulphite
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Food preservatives are chemicals that are used to inhibit microbial growth in food. These chemicals are food additives and increase the shelf life of food. Sodium benzoate and sodium metabisulphite are the common food preservatives used in jams, jellies etc. Thus the correct answer is option D.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Vinegar used as preservative for pickles, is _____ % aqueous solution of acetic acid.

  1. 1 to 2

  2. 5 to 8

  3. 25 to 30

  4. 100
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commercial vinegar used for cooking and preserving pickles typically contains roughly 5 to 8 percent acetic acid by volume in an aqueous solution. Therefore, 5 to 8 is the correct range.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Heating milk at 65$^o$C followed by sudden cooling is known as

  1. Sterilization

  2. Preservation

  3. Pasteurization

  4. Fermentation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pasteurization is a heat treatment process where the milk is heated at 60-70$^0$C for 15 to 30 seconds and suddenly chilled and store. This method is used to kill the bacteria in liquid and foods and inhibits their further growth. It is named for the French scientist, Louis Pasteur, who gave this preservation technique in the 1860s.

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Pasteurised milk is

  1. Sterile and will not turn sour

  2. Free from pathogenic bacteria

  3. Not free from bacteria

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pasteurization is the preservation technique of milk. It is used 

  1. To increase milk safety for the consumer by destroying disease-causing microorganisms (pathogens) that may be present in milk.
  2. To increase keeping the quality of milk products by destroying spoilage microorganisms and enzymes that contribute to the reduced quality and shelf life of milk.
Therefore, the correct answer is option D.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Pasteurization means_____________

  1. Vaccination of a baby against smallpox
  2. Sterilization in steam cooker at 100$^{\circ}$C
  3. Heating milk or other liquids to 60$^{\circ}$C to 70$^{\circ}$C for short duration

  4. A technique of curing people bitten by mad dogs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pasteurization is a heat treatment process where the milk is heated at 70$^0$C for 15 to 30 seconds and suddenly chilled and store. This method is used to kill the bacteria in liquid and foods and inhibits their further growth. It is named for the French scientist, Louis Pasteur, who gave this preservation technique in the 1860s. Thus, the correct answer is option C. 

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Food spoilage can be prevented by

  1. Heating of food

  2. Using chemicals

  3. Canning

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the food is not edible to humans or its quality of edibility becomes reduced is called as food spoilage and the food which get easily spoiled called as perishable food. Various external factors are responsible for the spoilage of food.

A number of methods of prevention can be used that can either totally prevent, delay, or otherwise reduce food spoilage such as the addition of chemical preservatives, refrigeration, Freezing, boiling of foods above the danger zone (140$^{\circ}$F/58$^{\circ}$C) for over 24 hours and canning of food can preserve food for a particularly long period of time. Thus, the correct answer is option D.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Mark the statement which is not true for sugar as preservative

  1. Sugar inhibits the growth of bacteria

  2. It protects the food from spoilage

  3. Squashes can't be prepared by sugar

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Jams, jellies and squashes are preserved by sugar. Sugar reduces moisture content and inhibits the growth of bacteria.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Pasteurized milk can be consumed without boiling why?

  1. As it is free from enzymes

  2. As it is free from microbes

  3. As it is free from preservatives

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pasteurized milk can be consumed without boiling as it free from harmful microbes. The process was discovered by Louis Pasteur.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Why salts and edible oils are known as preservatives ?

  1. Because they can kill all microbes even the viruses

  2. They checks the growth of microbes

  3. They are tasty

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Salts and edible oils are the common chemicals generally used to check the growth of microorganisms. Therefore they are called preservatives.

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Mark the correct statement:
a) Pasteurized milk can be consumed without boiling as it is free from harmful microbes
b) The milk is heated to about $700^{\circ}C$ for $15$ to $30$ seconds and then suddenly chilled and stored
c) Pasteurization prevents the growth of microbes

  1. a, b

  2. b, c

  3. a, c

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pasteurized milk can be consumed without boiling as it is free from harmful microbes. The milk is heated to about $700C$ for $15$ to $30$ seconds and then suddenly chilled and stored. By doing so, it prevents the growth of microbes. This process was discovered by Louis Pasteur. So, It is called pasteurization.

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Purpose of milk pasteurization

  1. Strips bacteria of oxygen

  2. Make the milk tasty for drinking

  3. Destroy microbes

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Milk is pasteurized to destroy microbes, but many more heat resistant organisms are only reduced in number. Pasteurization kills the harmful microorganisms present in milk..

Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Mark the incorrect statement

  1. Salts and edible oils are the common chemicals generally used to check the growth of viruses.

  2. We add salt or acid preservatives to pickles to prevent the attack of microbes.

  3. Sodium benzoate and sodium metabisulphite are common chemical preservatives.

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Salts and edible oils are the common chemicals generally used to check the growth of microorganisms. Therefore, they are called  preservatives. We add salt or acid preservatives to pickles to prevent the attack of microbes. Sodium benzoate and sodium metabisulphite are common preservatives. These are also used in the jams and squashes to check their spoilage.