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

Why are preservatives added to food?

  1. To make food tasty

  2. For improving texture, colour and flavour of food

  3. To preserve food for long time

  4. To make food more nutritious

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Preservatives are substances that prevent attack and growth of micro organisms in food and prevent its spoilage. So, to keep food for longer duration, preservatives are added. 

Multiple choice

What are the conditions at which milk is boiled to prevent growth of microbes?

  1. At 70oC for 5 to 7 min

  2. At 50oC for 15 to 30 second

  3. At 70oC for 15 to 30 second

  4. At 70oC for 15 to 30 min

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 High temperature prevents growth of microbes but providing high temperature for longer duration than the required time can even spoil the food. So, optimally, heating the food substance at 70oC for 15-30 seconds, helps prevent growth of microorganisms. 

Multiple choice

Which of the following is not a method of preservation?

  1. Deep freezing

  2. Canning

  3. Pasteurization

  4. Immunization

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Deep freezing involves keeping food  at low temperature to prevent growth of micro organisms. Canning involves preservation through cutting off atmospheric contact with food. Pasteurization is a method of preserving milk by boiling and cooling it immediately. Thereafter, immunization refers to the protection against diseases by vaccination and is thus not a method of preservation. 

Multiple choice

Why are grains dried before storage?

  1. To make more storage space

  2. To separate them from chaff

  3. To reduce moisture in them

  4. Both (1) and (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Grains are dried before storage so that they do not get spoilt or attacked by microorganisms.

Multiple choice

Why is it advised to cook food properly and avoid excessive heating?

  1. Because it may result in the loss of taste.

  2. Because it may result in the loss of nutrients.

  3. Because it may result in the burning of food.

  4. Because it may result in the growth of microorganisms in the food.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Food should be cooked properly so that its nutrients are not lost.

Multiple choice

A lady was about to pack jams and pickles that she made in containers, for long time storage. Before she did the packing, she first washed all the bottles well and then dried them well in the sun. Why were the bottles sun dried?

  1. Food stored in sun dried bottles develop better flavour.

  2. This gives her more time for preparing food.

  3. To remove any trace of moisture.

  4. For better packing.

  5. There was no specific reason why she did it.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is done to remove any trace of moisture, so as to prevent bacterial growth.

Multiple choice

The factor most responsible for making a good ice cream is

  1. Water content

  2. Homogenization

  3. Emulsifying agent

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

Homogenization reduces fat globule size and increases the surface area coated by proteins, which is crucial for achieving a smooth, creamy texture and proper fat emulsion in ice cream.