Tag: food spoilage, adulteration and preservation

Questions Related to food spoilage, adulteration and preservation

Food spoilage can be prevented by

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

  1. Heating of food

  2. Using chemicals

  3. Canning

  4. All of the above

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Correct Option: D
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.

Milk can be preserved by __________________

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

  1. Pasteurization

  2. Drying

  3. Chemical preservatives

  4. Freezing

Show answer
Correct Option: A
Explanation:
  • Pasteurization is a process of heating the milk enough to kill the most of the bacteria which can spoil the milk. This prevents milk spoiling for a longer time. 

Which of the following diseases has incubation period less than one week?

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

  1. Tuberculosis

  2. Leprosy

  3. Influenza

  4. Food poisoning

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Correct Option: D
Explanation:

The time between the infection in the host by a pathogen and the host begins to show symptoms is called as the incubation period. Some diseases have rapid incubation period whereas some have a longer period of incubation. food poisoning is the infection caused by the ingestion of spoiled food, has very rapid incubation period i.e., less than one week.

Pasteurised milk is______________

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

  1. Sterile and will not turn sour

  2. Free from pathogenic bacteria

  3. Not free from bacteria

  4. Both A and B

Show answer
Correct Option: D
Explanation:
  • Pasteurization is a process of heating food, which is usually a liquid, to a specific temperature for a predefined length of time and then immediately cooling it after it is removed from the heat. 
  • Raw milk is milk from cows, sheep, or goats that has not been pasteurized to kill harmful bacteria. 
  • This raw, unpasteurized milk can carry dangerous bacteria such as Salmonella, E. coli, and Listeria, which are responsible for causing numerous foodborne illnesses.
  •  Pasteurization makes sure milk is safe to drink by killing any bacteria and also helps to prolong its shelf life.
  •  The process of pasteurization involves heating milk to 71.7°C for at least 15 seconds. Once the milk has been heated, it is then cooled very quickly to less than 3°C. 

All living organisms are killed by heat treatment known as_____________

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

  1. Pasteurisation

  2. Immunity

  3. Sterilisation

  4. Autoimmunity

Show answer
Correct Option: C
Explanation:
Sterilisation is a technique to prolong the shelf life of foods. In general the food products are heated to 110 to 135°C for about 15 to 20 minutes. For some canned products they are heated for up to one hour. All micro-organisms are killed during this process. After sterilisation the product is free of germs and, if stored correctly, have a shelf life of several years. Heat-sensitive vitamins are destroyed for the benefit of a long shelf life. Taste and colour of the food are also affected by the heat. Sterilisation is used for foods like meat, poultry, vegetables, fruits and milk. 
Therefore, the correct answer is option C.

Which of the following rot completely and do not smell ?

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

  1. Left over food

  2. Broken glass

  3. Aluminium wrapper

  4. Polythene bags

Show answer
Correct Option: A
Explanation:

The correct answer is 'leftover food'

For anything to rot completely, the microorganisms present in the environment should be able to breakdown the material by the use of their enzymes. Leftover food is easily degraded by these enzymes whereas broken glass, aluminium wrappers and polythene bags don't rot because these enzymes cannot degrade them(or the enzyme action on these substances is so slow that rotting is insignificant)
So the correct option is A.

Mark the statement which is not true for sugar as preservative

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

  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

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Correct Option: C
Explanation:

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

In Pasteurization, the milk is heated for

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

  1. $30-60 secs$

  2. $1-5 min$

  3. $15-30 sec$

  4. $1-2 sec$

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Correct Option: C

Use of oil and vinegar in pickles

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

  1. Prevents spoilage of pickles

  2. Prevents growth of bacteria

  3. Kills the algae

  4. Both A and B

Show answer
Correct Option: D
Explanation:

Use of oil and vinegar prevents spoilage of pickles because bacteria cannot live in such an environment.

Mark the correct statement

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

  1. Sugar inhibits the growth of bacteria which enhances the activity of enzymes

  2. Sugar inhibits the growth of microbes which inhibits the growth of bacteria that spoil food

  3. Sugar reduces the rate of enzyme activity

  4. Both A and B

Show answer
Correct Option: B
Explanation:

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