Science General · Chemistry

Food Processing and Storage

2,379 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

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.

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

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.

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

Chemical preservatives are used for

  1. Preserve jams jellies

  2. Pickles

  3. Ketchups

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

Chemical preservatives like sodium benzoate or potassium sorbate are commonly used across a variety of processed foods, including jams, jellies, pickles, and ketchups, to extend shelf life.

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) Food must be properly stored to prevent food poisoning.
b) Food poisoning can occur when food is left unrefrigerated for longer period of time.
c) Mishandling of food can also cause food poisoning.

  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

Food must be properly stored to prevent food poisoning. Food poisoning can occur when food is left unrefrigerated for longer period of time. Mishandling of food can also cause food poisoning.

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

The undesirable change in a food that makes it unsafe for human consumption is referred as

  1. Food decay

  2. Food spoilage

  3. Food loss

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

Food spoilage is the decrease in the original nutritional value, texture and flavor of the food. Such food becomes harmful and unsuitable for human consumption. This can happen due to bacterial or fungal action if food is left open for a long time. In uncooked food, autolysis may take place in which food is decomposed by self-enzymes. Food spoilage can be prevented by adding preservatives. Thus, the correct answer is option B.

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

Which one of these foods is likely to contain the most bacteria?

  1. Cooked chicken

  2. Tinned cream

  3. Frozen raw chicken

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

frozen raw chicken contains the most bacteria even though it is frozen the bacteria does not die their growth is stopped but the bacteria is still present where as in the cooked chicken it is killed and in tinned cream and mayonnaise they are processed.

So, the correct answer is 'Frozen raw chicken'

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

Food contaminated with food poisoning bacteria would

  1. Smell

  2. Change colour

  3. Look normal

  4. Be slimy and bitter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The food containing food poisoning bacteria does not change colour, taste, and smell of the food hence it cannot be recognized by the senses and the food looks normal

So, the correct answer is 'Look normal'

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

Which one of these statements about bacteria is true?

  1. All types of bacteria give food poisoning.

  2. Freezing makes food last longer by killing bacteria.

  3. Bacteria grow fastest when they are warm.

  4. All bacteria need air to survive.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
 At 37°C bacteria start growing but start multiply between 5°C and 63°C.
 at room temperature, if the food is left out for any more than two hours. bacterial growth will be rapid. all types of bacteria won't give food poisoning.
Freezing does not kill bacteria only their growth stops. 
Some bacteria can survive even without air like in food gravy and sauces.
So, the correct answer is 'Bacteria grow fastest when they are warm'