Principles of Refrigerated Gas Storage of Foods-2

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: Under hypobaric storage, oxygen content is reduced to reduce the rate of synthesis of volatile.
True, False
True, True
False, False
False, True
Explanation:
Under hypobaric storage, oxygen content is reduced to reduce the rate of synthesis of volatile. Altering respiration can help in decreasing the production of carbon dioxide.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following variables affect gas exchanges into and out of the package?
Weight of apples
Ethylene concentration
Structure of the packaging film
All of the mentioned
Explanation:
Structure of the packaging film affect gas exchanges into and out of the package. Weight of apples and Ethylene concentration affect respiration.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: Influence of bacteria has more effect on the storage of food than the pH control.
True, myoglobin
True, haemoglobin
False, myoglobin
False, haemoglobin
Explanation:
Influence of bacteria has more effect on the storage of food than the pH control. Meat color is due to the presence of myoglobin.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is NOT delivered by the modified atmosphere (MA) or controlled atmosphere (CA)?
Delay ripening of fruits
Retard spread of diseases
Toughing
Incidence of storage disorders
Explanation:
Toughening and yellowing are NOT delivered by the modified atmosphere (MA) or controlled atmosphere (CA). The other positive things like delaying ripening of fruits, retarding spread of diseases and incidence of storage disorders are delivered.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Under hypobaric storage, when gas is in equilibrium with its surroundings, the diffusivity _____ and concentration gradient _____
Increase by ten folds, decreases to one-tenth
Decreases to one-tenth, increase by ten folds
Stays constant, stays constant
None of the mentioned
Explanation:
Under hypobaric storage, when gas is in equilibrium with its surroundings, the diffusivity increase by ten folds and concentration gradient decreases to one-tenth. This is because the concentration difference reduces to a large extent and hence the gradient decreases but since a new equilibrium is established and this always happens, the diffusivity increase.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: Sub atmospheric storage involves ventilating the produce with air saturated with water vapor by continuously evacuating the container with a sealed vacuum pump.
True, False
True, True
False, False
False, True
Explanation:
Sub atmospheric storage involves ventilating the produce with air saturated with water vapor by continuously evacuating the container with a sealed vacuum pump. Under hypobaric storage, a gas in equilibrium with its surroundings will have its outward diffusion rate proportional to concentration gradient and diffusivity.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: Under hypobaric storage, the gas always attains equilibrium with its surroundings.
True, False
True, True
False, False
False, True
Explanation:
Under hypobaric storage, the gas always attains equilibrium with its surroundings. Hypobaric storage is a continuous process.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is NOT the correct method to enhance storage?
Reducing pressure
Increasing ethylene
Decreasing respiration
None of the mentioned
Explanation:
Ethylene given out by produce should be reduced to enhance storage/life.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: A gas atmosphere containing 20% CO2 is effective in inhibiting slime-producing bacteria.
True, False
True, True
False, False
False, True
Explanation:
A gas atmosphere containing 20% CO2 is effective in inhibiting slime-producing bacteria. Meat can be preserved by protecting it from oxygen as majority of bacteria grow in that atmosphere.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is true with respect to volatile by controlling oxygen content in storage?
Lowing in endogenous concentration increases rate of volatile formation
Anaerobiosis favors its production if it is a highly reduced compound
Limiting the amount of energy available
All of the mentioned
Explanation:
All of the mentioned is true with respect to volatile by controlling oxygen content in storage.