Fruits and vegetables preservation and processing Part 2

Question No. 1 Marks +1 -0 Time

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What is the primary function of adding salt to cabbage when making sauerkraut?

A. To add a savory flavor
B. To draw out water from the cabbage through osmosis, creating a brine for fermentation.
C. To kill all bacteria present on the cabbage.
D. To make the cabbage more colorful.

Question No. 2 Marks +1 -0 Time

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Which of the following is an example of a non-enzymatic browning reaction that can occur in some processed fruit products?

A. The browning of a cut apple exposed to air.
B. The development of a golden-brown crust on baked bread.
C. The dark color of caramel produced by heating sugar.
D. The greening of potatoes exposed to light.

Question No. 3 Marks +1 -0 Time

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A food manufacturer wants to produce a clear apple juice with a long shelf life. What would be the typical sequence of processing steps?

A. Pressing -> Pasteurization -> Clarification -> Bottling
B. Clarification -> Pressing -> Bottling -> Pasteurization
C. Pressing -> Clarification -> Pasteurization -> Aseptic filling
D. Freezing -> Pressing -> Bottling -> Thawing

Question No. 4 Marks +1 -0 Time

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What is the term for the process of heat-treating a food product to kill pathogenic microorganisms and reduce the number of spoilage organisms, while not necessarily sterilizing the food?

A. Blanching
B. Pasteurization
C. Irradiation
D. Fermentation

Question No. 5 Marks +1 -0 Time

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Which of the following is a major disadvantage of sun-drying as a method of food preservation?

A. It is a very expensive method.
B. It is dependent on weather conditions and can be slow.
C. It leads to a significant increase in the weight of the food.
D. It can only be used for vegetables, not fruits.

Question No. 6 Marks +1 -0 Time

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What is the role of 'starter cultures' in the production of some fermented foods?

A. To provide the initial food source for fermentation.
B. To introduce a specific strain of desired microorganisms to ensure a consistent and controlled fermentation.
C. To sterilize the food before fermentation begins.
D. To add flavor and color to the final product.

Question No. 7 Marks +1 -0 Time

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In the context of food packaging, what is a 'hermetic seal'?

A. A seal that allows for the exchange of gases.
B. A seal that is completely airtight and prevents the entry of microorganisms, gases, and moisture.
C. A seal that is easy to open and close.
D. A temporary seal used during processing.

Question No. 8 Marks +1 -0 Time

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What is the main reason that root vegetables like carrots and potatoes are often stored in a cool, dark, and humid environment?

A. To encourage them to sprout.
B. To slow down their respiration rate and prevent moisture loss.
C. To increase their sugar content.
D. To protect them from freezing.

Question No. 9 Marks +1 -0 Time

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What is the purpose of 'curing' in the context of preserving vegetables like onions and garlic?

A. To make them sweeter.
B. To develop a protective, dry outer layer that helps to prevent moisture loss and spoilage.
C. To infuse them with a smoky flavor.
D. To prepare them for pickling.

Question No. 10 Marks +1 -0 Time

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Which of the following processing methods would be most effective at preserving the vitamin C content of orange juice?

A. Traditional pasteurization followed by bottling.
B. High-Pressure Processing (HPP).
C. Concentrating the juice by boiling.
D. Sun-drying the juice into a powder.

Question No. 11 Marks +1 -0 Time

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What is a 'refractometer' used for in the fruit and vegetable processing industry?

A. To measure the color of the product.
B. To measure the pH or acidity.
C. To measure the Total Soluble Solids (TSS), primarily the sugar content, in a liquid.
D. To count the number of microorganisms.

Question No. 12 Marks +1 -0 Time

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Why is it generally recommended to peel vegetables like cucumbers and zucchini before pickling?

A. The peel contains bitter compounds.
B. The peel can prevent the pickling solution from penetrating the vegetable evenly.
C. The peel is tough and does not soften during pickling.
D. The peel has no nutritional value.

Question No. 13 Marks +1 -0 Time

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What is the principle of 'osmotic dehydration'?

A. Using a vacuum to pull water out of the food.
B. Placing the food in a concentrated salt or sugar solution to draw out water through osmosis.
C. Drying the food with hot air.
D. Freezing the food and then removing the ice through sublimation.

Question No. 14 Marks +1 -0 Time

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What is 'freezer burn' and what causes it?

A. A type of bacterial contamination that occurs in the freezer.
B. The discoloration of food due to being stored at too low a temperature.
C. The dehydration of the surface of a frozen food, caused by exposure to air.
D. The formation of large ice crystals on the surface of the food.

Question No. 15 Marks +1 -0 Time

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Which of the following is a common spoilage microorganism in high-acid foods like fruit juices?

A. Clostridium botulinum
B. Yeast
C. Salmonella
D. Listeria monocytogenes

Question No. 16 Marks +1 -0 Time

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What is the purpose of 'leaching' or 'soaking' some vegetables, like olives, in water before further processing?

A. To increase their water content.
B. To remove bitter compounds.
C. To soften their texture.
D. To clean them thoroughly.

Question No. 17 Marks +1 -0 Time

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What is 'ohmic heating'?

A. A method of heating food using microwaves.
B. A process where an electric current is passed through a food product, and the food's electrical resistance causes it to heat up.
C. Heating food by direct contact with a hot surface.
D. Using high-pressure steam to cook food.

Question No. 18 Marks +1 -0 Time

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In the context of food preservation, what does 'Hurdle Technology' refer to?

A. A method of packaging that creates a physical barrier to microorganisms.
B. Using a series of preservation methods in combination to create a synergistic effect.
C. A technique for overcoming the challenges of preserving a specific food.
D. A type of advanced thermal processing.

Question No. 19 Marks +1 -0 Time

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Why is honey sometimes used as a preserving agent for fruits?

A. It is acidic.
B. It has a high sugar content and low water activity, creating an environment hostile to microbes.
C. It contains natural antibiotics.
D. It forms a physical barrier around the fruit.

Question No. 20 Marks +1 -0 Time

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A batch of homemade pickles is found to be soft and mushy. What is a likely cause?

A. Using a brine that was not salty enough.
B. Using overripe or old cucumbers.
C. The pickles were not processed in a water bath canner.
D. Too much vinegar was used.

Question No. 21 Marks +1 -0 Time

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What is the function of the enzyme 'pectinase' in fruit juice production?

A. To create a gel in jellies.
B. To break down pectin and increase juice yield and clarity.
C. To preserve the color of the juice.
D. To enhance the sweetness.

Question No. 22 Marks +1 -0 Time

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What is the main difference between 'hot break' and 'cold break' processing of tomatoes for products like paste and sauce?

A. 'Hot break' uses higher temperatures and results in a thicker product due to pectin preservation.
B. 'Cold break' is a faster process.
C. 'Hot break' is used for fresh-market tomatoes, while 'cold break' is for processing tomatoes.
D. There is no significant difference; the terms are interchangeable.

Question No. 23 Marks +1 -0 Time

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What is 'sous-vide' cooking, and how can it be used for preservation?

A. It is a method of grilling over an open flame.
B. It involves cooking food in a vacuum-sealed bag in a precisely controlled water bath, often followed by rapid chilling for preservation.
C. It is a type of fermentation.
D. It is a method of drying food using a vacuum.

Question No. 24 Marks +1 -0 Time

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What is the purpose of adding an 'oxygen scavenger' or 'oxygen absorber' to a package of dried food?

A. To add flavor to the food.
B. To absorb any residual oxygen in the package, thus preventing oxidative spoilage and microbial growth.
C. To keep the food dry.
D. To prevent the package from collapsing.

Question No. 25 Marks +1 -0 Time

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Why is it important to use 'pickling salt' or pure granulated salt rather than table salt when making pickles?

A. Pickling salt is much saltier.
B. Table salt contains anti-caking agents that can make the brine cloudy and may affect the fermentation.
C. Pickling salt dissolves faster.
D. Table salt is not effective at preserving food.

Question No. 26 Marks +1 -0 Time

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What is a 'controlled atmosphere' (CA) storage facility for fruits like apples?

A. A regular refrigerated warehouse.
B. A storage facility where the temperature, humidity, and the levels of oxygen, carbon dioxide, and nitrogen are precisely controlled.
C. A warehouse that is kept completely dark.
D. A type of underground storage cellar.

Question No. 27 Marks +1 -0 Time

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What is 'lye peeling' in the context of fruit and vegetable processing?

A. Peeling the produce by hand with a special knife.
B. Using a hot solution of sodium hydroxide (lye) to dissolve and loosen the peel.
C. Using high-pressure water jets to remove the peel.
D. A method of peeling using abrasive rollers.

Question No. 28 Marks +1 -0 Time

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What is the main reason for the spoilage of fresh berries, like strawberries and raspberries?

A. They have a very high water content and a delicate structure, making them susceptible to mold growth and physical damage.
B. They have a low sugar content.
C. They are very acidic.
D. They do not have a protective peel.

Question No. 29 Marks +1 -0 Time

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What is 'blanching' in the context of drying vegetables?

A. Soaking the vegetables in a salt solution.
B. A brief heat treatment in boiling water or steam before drying.
C. Coating the vegetables with sugar.
D. Drying the vegetables in the dark.

Question No. 30 Marks +1 -0 Time

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A jar of home-canned fruit has a very pale, washed-out color. What is a possible reason for this?

A. The fruit was overripe when canned.
B. The fruit was over-processed (cooked for too long or at too high a temperature).
C. Too much sugar was used in the syrup.
D. The wrong type of jars was used.

Question No. 31 Marks +1 -0 Time

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What is 'hydro-cooling' in post-harvest handling of vegetables?

A. Drying vegetables using a fan.
B. Rapidly cooling freshly harvested produce by immersing it in or spraying it with chilled water.
C. A method of cleaning vegetables with high-pressure water.
D. A type of irrigation system.

Question No. 32 Marks +1 -0 Time

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What is the difference between a 'conduction' oven and a 'convection' oven, and how does this relate to drying food?

A. A convection oven has a fan that circulates hot air, leading to more even and faster drying.
B. A conduction oven is hotter.
C. A convection oven uses microwaves.
D. There is no difference in their drying performance.

Question No. 33 Marks +1 -0 Time

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What is the role of 'lactic acid bacteria' in the fermentation of pickles and sauerkraut?

A. They produce alcohol.
B. They consume the sugars in the vegetables and produce lactic acid, which acts as a preservative.
C. They break down the vegetables into a liquid.
D. They are spoilage organisms that need to be eliminated.

Question No. 34 Marks +1 -0 Time

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What is 'candying' or 'crystallizing' as a method of fruit preservation?

A. Freezing the fruit with a sugar syrup.
B. Slowly replacing the water in the fruit with a concentrated sugar syrup, resulting in a high-sugar, low-moisture product.
C. Coating the fruit with a hard sugar shell.
D. Drying the fruit and then rolling it in sugar.

Question No. 35 Marks +1 -0 Time

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Why is it important to quickly cool down hot-filled jars of jam or jelly after sealing?

A. To prevent the jars from breaking.
B. To ensure that a strong vacuum seal is formed and to prevent the growth of thermophilic (heat-loving) bacteria.
C. To make the product set faster.
D. To prevent the color from fading.

Question No. 36 Marks +1 -0 Time

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What is 'sublimation' in the context of freeze-drying?

A. The process of melting ice into water.
B. The transition of a substance directly from the solid phase (ice) to the gas phase (water vapor), without passing through the liquid phase.
C. The compression of a gas into a liquid.
D. The boiling of a liquid.

Question No. 37 Marks +1 -0 Time

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Which of the following would be considered a 'low-acid' food, requiring processing in a pressure canner for safe home canning?

A. Apples
B. Tomatoes
C. Green beans
D. Lemons

Question No. 38 Marks +1 -0 Time

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What is the purpose of the 'float test' for eggs?

A. To see if the egg will float in water, which can indicate its freshness.
B. To test the strength of the eggshell.
C. To determine the color of the yolk.
D. To see if the egg is fertile.

Question No. 39 Marks +1 -0 Time

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What is 'creaming' in the context of honey?

A. The process of skimming impurities off the top of the honey.
B. The controlled crystallization of honey to produce a smooth, spreadable product.
C. Mixing honey with cream to make a dessert.
D. The separation of honey into layers.

Question No. 40 Marks +1 -0 Time

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A person opens a jar of home-canned peaches and notices a fine, white sediment at the bottom of the jar. The liquid is clear, and the peaches look and smell fine. What is the most likely cause of this sediment?

A. Spoilage
B. The use of hard water, which contains minerals that can settle out.
C. The peaches were not ripe enough.
D. The jar was not sealed properly.

Question No. 41 Marks +1 -0 Time

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What is the function of an 'agitator' in a large-scale food processing tank used for making sauces or soups?

A. To heat the product.
B. To continuously stir the product to ensure even heating and prevent scorching.
C. To cool the product down quickly.
D. To measure the volume of the product.

Question No. 42 Marks +1 -0 Time

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What is 'brining' and how does it contribute to preservation?

A. It is a method of cooking in a salt solution.
B. It is the process of soaking a food, particularly meat or vegetables, in a solution of salt and water (a brine). It adds flavor, can improve texture, and inhibits the growth of some microbes.
C. It is a type of drying method.
D. It is the process of coating food in breadcrumbs.

Question No. 43 Marks +1 -0 Time

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Why are dark-colored glass bottles often used for packaging products like olive oil and some fruit juices?

A. They are cheaper to produce.
B. They help to protect the contents from light, which can cause oxidative degradation and loss of vitamins.
C. They keep the product colder.
D. The dark color is purely for aesthetic reasons.

Question No. 44 Marks +1 -0 Time

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What is 'casein' and how does it relate to the processing of some beverages?

A. It is a type of sugar.
B. It is the main protein found in milk, and it is sometimes used as a 'fining' agent to clarify wine or juice.
C. It is a type of preservative.
D. It is a type of food coloring.

Question No. 45 Marks +1 -0 Time

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What is a ' retort' in the context of commercial canning?

A. The machine that labels the cans.
B. A large, industrial pressure vessel used to sterilize canned foods after they have been sealed.
C. The conveyor belt that moves the cans through the factory.
D. A device for testing the seal on the cans.

Question No. 46 Marks +1 -0 Time

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What is the difference between a 'puree' and a 'paste'?

A. A puree is made from vegetables, while a paste is made from fruits.
B. A paste is a more concentrated form of a puree, with a lower moisture content and a thicker consistency.
C. A puree is smooth, while a paste contains chunks of the original food.
D. The terms are interchangeable.

Question No. 47 Marks +1 -0 Time

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What is the 'isoelectric point' and how is it relevant to the production of some fruit and vegetable proteins?

A. It is the temperature at which the protein denatures.
B. It is the pH at which a protein has no net electrical charge, making it least soluble and prone to precipitation.
C. It is the point at which the protein is most stable.
D. It is a measure of the protein's nutritional value.

Question No. 48 Marks +1 -0 Time

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What is a 'trommel screen' used for in a fruit and vegetable processing plant?

A. To wash the produce.
B. To sort the produce by size.
C. To peel the produce.
D. To chop the produce.

Question No. 49 Marks +1 -0 Time

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A consumer is making a fruit smoothie and wants to prevent it from turning brown. Which of the following ingredients would be most effective to add?

A. A spoonful of sugar
B. A splash of lemon juice
C. A pinch of salt
D. A drop of vanilla extract

Question No. 50 Marks +1 -0 Time

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What is the main purpose of 'waxing' some fruits and vegetables, like apples and cucumbers?

A. To make them look shiny and more appealing.
B. To reduce moisture loss, slow down respiration, and extend shelf life.
C. To add flavor.
D. To protect them from bruising during transport.

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