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JCE Home Economics study materials
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JCE Home Economics practice questions

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Question 1Food and Nutrition

Which nutrient is the body's most concentrated source of energy per gram, providing about 9 kcal per gram?

  1. Protein
  2. Fat Correct answer.
  3. Dietary fibre
  4. Carbohydrate

Explanation

Fat yields roughly 9 kcal per gram, whereas protein and carbohydrate each yield about 4 kcal per gram. Because fat is the most energy-dense macronutrient, it supplies the largest number of kilocalories for a given weight of food.

Question 2Food and Nutrition

Which vitamin is synthesised in the skin on exposure to ultraviolet light from sunlight?

  1. Vitamin C
  2. Vitamin A
  3. Vitamin D Correct answer.
  4. Vitamin K

Explanation

Ultraviolet B light converts a cholesterol derivative in the skin into a precursor of vitamin D, which is then activated by the liver and kidneys. This makes sunlight exposure an important source alongside dietary sources such as oily fish and fortified foods.

Question 3Food and Nutrition

In the kitchen, which practice best reduces the risk of cross-contamination when preparing raw chicken and salad vegetables?

  1. Rinsing the chicken under the tap before chopping the salad
  2. Preparing the salad first on the same board the chicken will use
  3. Using a separate chopping board and knife for the raw chicken Correct answer.
  4. Wiping the board with a dry cloth between tasks

Explanation

Raw poultry can carry pathogens such as Campylobacter and Salmonella, which transfer readily to ready-to-eat foods via boards, knives and hands. Using separate equipment for raw meat and salad prevents this transfer.

Question 4Food and Nutrition

Which change to a person's diet is most likely to increase their intake of dietary fibre?

  1. Replacing grilled fish with fried fish
  2. Replacing semi-skimmed milk with whole milk
  3. Replacing boiled potatoes with mashed potatoes
  4. Replacing white bread with wholemeal bread Correct answer.

Explanation

Wholemeal bread retains the bran and germ of the grain, which are rich in cellulose and other non-starch polysaccharides. Refining wheat to make white flour removes much of this fibre.

Question 5Food and Nutrition

Which food group is the richest dietary source of calcium?

  1. Vegetable oils
  2. Milk and dairy products Correct answer.
  3. Fresh fruit
  4. White rice and pasta

Explanation

Milk, cheese and yoghurt provide calcium in a well-absorbed form and are the main contributors to calcium intake in most diets. Fruit, refined grains and oils contain comparatively little calcium.

Question 6Food and Nutrition

What does the term 'gelatinisation' describe in food preparation?

  1. The swelling of starch granules in hot liquid, which thickens the mixture Correct answer.
  2. The solidifying of fat when chilled
  3. The browning of sugar when heated dry
  4. The setting of pectin in jam on cooling

Explanation

When starch is heated in water, its granules absorb liquid, swell and eventually burst, releasing starch molecules that thicken the mixture. This process is the basis of sauces such as white sauce.

Question 7Food and Nutrition

Which statement correctly describes the role of protein in the diet?

  1. It acts as the main solvent for body fluids
  2. It supplies amino acids for growth and repair of body tissues Correct answer.
  3. It is the primary structural component of cell membranes
  4. It is the body's main store of energy in adipose tissue

Explanation

Dietary protein is broken down into amino acids, which are used to build and repair muscle, skin, enzymes and other body proteins. Energy provision is a secondary role when intake exceeds need.

Question 8Food and Nutrition

A recipe lists 'creaming' as the first step in making a cake. What does this technique involve?

  1. Heating sugar with water to form a syrup
  2. Folding flour into a liquid mixture gently
  3. Whisking egg whites until they form stiff peaks
  4. Beating fat and sugar together until pale and fluffy Correct answer.

Explanation

Creaming incorporates air into fat while the sugar crystals help trap it, giving a light texture and good rise. It is a standard method in the creaming or 'sugar batter' cake-making process.

Question 9Food and Nutrition

A label states that a food contains 20 g of carbohydrate per 100 g, of which 12 g is sugar. Which figure represents the starch content per 100 g?

  1. 32 g
  2. 20 g
  3. 12 g
  4. 8 g Correct answer.

Explanation

Total carbohydrate is the sum of sugars and starch, so starch equals total carbohydrate minus sugars. Subtracting 12 g of sugar from 20 g of carbohydrate gives 8 g of starch.

Question 10Food and Nutrition

Which combination of foods would provide a complete source of protein in a vegetarian meal?

  1. Butter and white bread
  2. Rice and lentils Correct answer.
  3. Olive oil and potatoes
  4. Lettuce and cucumber

Explanation

Cereals such as rice are low in lysine but rich in methionine, while pulses such as lentils are rich in lysine but low in methionine. Combining them supplies all essential amino acids in useful proportions.

Question 11Food and Nutrition

Which deficiency is most closely associated with a lack of vitamin C in the diet?

  1. Beriberi
  2. Rickets
  3. Night blindness
  4. Scurvy Correct answer.

Explanation

Vitamin C is needed for the synthesis of collagen, so a deficiency leads to scurvy, with bleeding gums, poor wound healing and fatigue. Citrus fruit, berries and peppers are important sources.

Question 12Food and Nutrition

Why is salt added to vegetables when preparing sauerkraut?

  1. To raise the pH so that moulds cannot grow
  2. To draw out water and create conditions that favour lactic acid bacteria Correct answer.
  3. To make the cabbage soften quickly in the jar
  4. To provide energy for the fermenting bacteria

Explanation

Salt draws water out of the cabbage by osmosis, creating a brine in which lactic acid bacteria thrive while many spoilage organisms are inhibited. The resulting acid fermentation preserves the vegetable and develops its flavour.

Question 13Food and Nutrition

What is the main purpose of blanching vegetables before freezing them?

  1. To increase the vitamin content of the vegetable
  2. To inactivate enzymes that cause loss of quality during frozen storage Correct answer.
  3. To remove all water so ice crystals cannot form
  4. To add colour and flavour before storage

Explanation

Brief heating in boiling water denatures enzymes such as peroxidase and polyphenol oxidase that would otherwise cause off-flavours, colour changes and nutrient loss during freezing. The vegetables are then cooled rapidly and frozen.

Question 14Food and Nutrition

A person following a vegan diet is most at risk of inadequate intake of which mineral?

  1. Fluoride
  2. Chlorine
  3. Sodium
  4. Iron Correct answer.

Explanation

Plant foods contain non-haem iron, which is less well absorbed than the haem iron found in meat and fish. Vegans therefore need to plan iron-rich plant foods with vitamin C to enhance absorption.

Question 15Food and Nutrition

Which statement best explains why a high intake of sugary drinks can contribute to dental caries?

  1. Sugar provides a substrate for oral bacteria that produce acid which demineralises enamel Correct answer.
  2. Sugar coats the teeth and prevents saliva from reaching them
  3. Sugar directly dissolves tooth enamel on contact
  4. Sugar increases saliva flow, which erodes the teeth

Explanation

Oral bacteria ferment sugars to acids that lower plaque pH and dissolve enamel mineral. Frequent sipping of sugary drinks keeps teeth exposed to acid for longer periods, raising caries risk.

Question 16Food and Nutrition

Which dietary change is most appropriate for a person advised to reduce saturated fat intake?

  1. Replacing butter with olive oil Correct answer.
  2. Replacing porridge with a croissant
  3. Replacing grilled fish with battered fish
  4. Replacing fruit with cream

Explanation

Butter is high in saturated fat, while olive oil is predominantly monounsaturated fat. Swapping butter for olive oil lowers saturated fat while keeping a source of dietary fat.

Question 17Food and Nutrition

Why does a starch-thickened sauce become thinner if it is stirred vigorously for a long time after thickening?

  1. The water in the sauce evaporates more quickly
  2. Shear forces break down the swollen starch granules and disrupt the gel network Correct answer.
  3. The starch is converted into sugar by the stirring
  4. The starch granules regain their original structure

Explanation

Once gelatinised, starch granules are fragile, and prolonged mechanical shear can rupture them and disrupt the network that holds water. The result is a loss of viscosity, which is why sauces are stirred gently after thickening.

Question 18Food and Nutrition

Which statement about the storage of eggs is correct?

  1. Eggs should be stored at room temperature to preserve flavour
  2. Eggs should be stored next to raw meat to save space
  3. Eggs should be washed before storage to remove the protective cuticle
  4. Eggs should be stored in the refrigerator and kept away from strong-smelling foods Correct answer.

Explanation

Refrigeration slows the loss of quality and limits bacterial growth, and the porous shell can absorb odours from nearby foods. Washing removes the natural cuticle that helps protect the shell, so eggs should not be washed before storage.

Question 19Food and Nutrition

Which factor most directly increases the glycaemic index of a potato dish?

  1. Adding a small amount of olive oil
  2. Mashing the potato finely and serving it hot Correct answer.
  3. Cooling the cooked potato before eating
  4. Serving the potato with a high-fibre salad

Explanation

Mashing disrupts cell structure and increases the surface area available for enzyme action, so the starch is digested and absorbed quickly, raising the glycaemic response. Cooling can increase resistant starch and lower the response.

Question 20Food and Nutrition

Which statement best describes the difference between a food allergy and a food intolerance?

  1. A food intolerance produces an immediate anaphylactic reaction
  2. A food intolerance is always more dangerous than an allergy
  3. A food allergy is caused by bacteria in food, whereas an intolerance is genetic
  4. A food allergy involves the immune system, whereas an intolerance does not Correct answer.

Explanation

Food allergy is an immune-mediated reaction, often involving IgE antibodies and potentially causing anaphylaxis. Food intolerance involves non-immune mechanisms such as enzyme deficiency and is generally less dangerous.

Question 21Food and Nutrition

A family of four eats a meal providing 2,400 kcal in total. If the meal supplies 90 g of protein, what percentage of the total energy comes from protein?

  1. 24%
  2. 36%
  3. 9%
  4. 15% Correct answer.

Explanation

Protein provides about 4 kcal per gram, so 90 g supplies 360 kcal. Dividing 360 by 2,400 and multiplying by 100 gives 15% of total energy from protein.

Question 22Food and Nutrition

Why does adding a large amount of acid, such as lemon juice, to a milk-based sauce risk causing it to curdle?

  1. Acid raises the boiling point so the sauce overheats
  2. Acid neutralises the fat and causes it to separate
  3. Acid reacts with starch to release water
  4. Acid lowers the pH to the isoelectric point of the milk proteins, causing them to coagulate Correct answer.

Explanation

Milk proteins such as casein carry a net negative charge at normal pH, which keeps them dispersed. Lowering the pH towards the isoelectric point removes this repulsion and the proteins aggregate, producing curdling.

Question 23Food and Nutrition

Which explanation best accounts for the higher iron bioavailability of a meal containing meat compared with an otherwise similar vegetarian meal?

  1. Meat contains phytates that bind iron and carry it into cells
  2. Meat raises stomach pH, improving iron solubility
  3. Meat provides haem iron, which is absorbed by a different and more efficient pathway Correct answer.
  4. Meat contains more vitamin C, which enhances iron absorption

Explanation

Haem iron from meat is absorbed by a specific mechanism and is less affected by dietary inhibitors than non-haem iron. Non-haem iron from plants is more sensitive to phytates, tannins and calcium.

Question 24Food and Nutrition

A manufacturer wishes to claim that a product is a 'source of fibre' in line with typical nutrient claim thresholds. Which condition is most consistent with such a claim?

  1. The food contains at least 30 g of fibre per 100 g
  2. The food contains no fibre but is wholegrain
  3. The food contains at least 3 g of fibre per 100 g Correct answer.
  4. The food contains at least 1 g of fibre per 100 kcal

Explanation

Nutrient claims are governed by threshold values, and a 'source of fibre' claim generally requires about 3 g of fibre per 100 g or 1.5 g per 100 kcal. Higher thresholds such as 6 g per 100 g are used for 'high fibre' claims.

Question 25Food and Nutrition

Why is the energy value of dietary fibre usually lower than that of digestible starch?

  1. Fibre is not a carbohydrate and therefore yields no energy
  2. Fibre is bound to protein, which blocks its absorption
  3. Human enzymes cannot break down most fibre, so it is fermented only partially by gut bacteria Correct answer.
  4. Fibre is absorbed directly in the stomach without digestion

Explanation

Most dietary fibre resists digestion by human enzymes and passes to the colon, where bacteria ferment part of it to short-chain fatty acids. This yields less energy than the complete digestion of starch to glucose.

Question 26Food and Nutrition

Which nutrient is the body's most concentrated source of energy, supplying 9 kcal per gram?

  1. Protein
  2. Carbohydrate
  3. Fat Correct answer.
  4. Vitamin C

Explanation

Fat supplies approximately 9 kcal per gram, whereas protein and carbohydrate each supply about 4 kcal per gram. This high energy density is why fat is described as the most concentrated macronutrient energy source.

Question 27Food and Nutrition

Which cooking method best preserves the water-soluble vitamins in vegetables?

  1. Adding bicarbonate of soda to the cooking water
  2. Boiling in a large volume of water for a long time
  3. Steaming until just tender Correct answer.
  4. Soaking in cold water before cooking

Explanation

Steaming minimises contact between the food and water, so fewer water-soluble vitamins such as vitamin C and folate leach out. Prolonged boiling and alkaline additions increase losses.

Question 28Food and Nutrition

Which practice best reduces the risk of food poisoning in a domestic kitchen?

  1. Cooling cooked rice slowly at room temperature overnight
  2. Defrosting frozen chicken on the kitchen worktop
  3. Storing raw meat above cooked foods in the fridge
  4. Washing hands before handling food and after touching raw meat Correct answer.

Explanation

Hand washing removes transient microorganisms and reduces cross-contamination between raw foods and ready-to-eat foods. Correct temperature control and separation of raw and cooked items are also essential food safety measures.

Question 29Food and Nutrition

Which statement correctly describes the role of dietary fibre in the digestive system?

  1. It is absorbed in the small intestine as amino acids.
  2. It supplies most of the body's energy needs.
  3. It adds bulk to the diet and helps prevent constipation. Correct answer.
  4. It is completely digested in the stomach to release glucose.

Explanation

Fibre is largely resistant to digestion and holds water, increasing stool bulk and promoting regular bowel movements. This is why adequate fibre intake is linked with reduced risk of constipation.

Question 30Food and Nutrition

Which food is a good source of iron in a typical mixed diet?

  1. Lettuce
  2. Butter
  3. Lean red meat Correct answer.
  4. White rice

Explanation

Lean red meat provides haem iron, which is well absorbed by the body. Other good sources include liver, pulses, and dark green leafy vegetables, though plant iron is less well absorbed.

Question 31Food and Nutrition

What does the term 'caramelisation' describe when sugar is heated?

  1. The dissolving of sugar in water
  2. The browning of sugar accompanied by the development of characteristic flavours Correct answer.
  3. The crystallisation of sugar on cooling
  4. The setting of a sugar solution into a gel

Explanation

Caramelisation is the thermal breakdown of sugars when heated, producing brown colour and complex sweet-bitter flavours. It is a non-enzymatic browning reaction distinct from the Maillard reaction, which involves proteins.

Question 32Food and Nutrition

Which piece of equipment is most suitable for accurately weighing small quantities of ingredients such as raising agents?

  1. A measuring jug
  2. A tablespoon
  3. A domestic balance accurate to 1 g Correct answer.
  4. A liquid measuring cup

Explanation

A balance gives weight measurements, which are more accurate than volume measures for small amounts of dry ingredients. Accuracy matters because excess raising agent can leave an unpleasant taste and affect texture.

Question 33Food and Nutrition

A student wants to test whether yeast produces carbon dioxide during fermentation. Which observation would confirm this?

  1. A glowing splint relights in the gas
  2. The mixture turns a deeper yellow colour
  3. The mixture becomes colder over time
  4. Limewater turns milky when the gas is bubbled through it Correct answer.

Explanation

Carbon dioxide turns limewater milky because it forms insoluble calcium carbonate. This is the standard test for the gas and would confirm that yeast fermentation has produced carbon dioxide.

Question 34Food and Nutrition

A sauce separates after being left to stand. Which technique is most likely to restore a smooth consistency?

  1. Adding cold water and stirring gently
  2. Boiling rapidly without stirring
  3. Reheating slowly while whisking in a little warm liquid Correct answer.
  4. Adding a large quantity of salt

Explanation

Gradual reheating with whisking helps re-emulsify a separated sauce by redistributing the fat droplets through the liquid phase. Sudden high heat tends to worsen separation.

Question 35Food and Nutrition

Which change to a recipe would most effectively lower the energy content of a baked product without greatly altering its structure?

  1. Adding extra sugar to improve browning
  2. Replacing some of the fat with an equal weight of fruit purée Correct answer.
  3. Adding more egg yolk to enrich the crumb
  4. Increasing the fat content to improve tenderness

Explanation

Fruit purée contributes moisture and bulk with far less fat and energy than butter or oil, so replacing part of the fat lowers the energy content. Some structure is retained because the purée adds bulk and moisture to the batter.

Question 36Food and Nutrition

Why should a flour mixture be sieved before making a sponge cake?

  1. To increase the water content of the flour
  2. To remove lumps and incorporate air for a lighter texture Correct answer.
  3. To increase the protein content of the flour
  4. To destroy enzymes that would prevent rising

Explanation

Sieving breaks up lumps and aerates the flour, helping to trap air and produce a lighter sponge. Even distribution of flour also improves mixing and reduces the risk of a dense crumb.

Question 37Food and Nutrition

A person with coeliac disease must avoid which component of wheat, barley, and rye?

  1. Lactose
  2. Pectin
  3. Casein
  4. Gluten Correct answer.

Explanation

Coeliac disease is an autoimmune reaction to gluten, a protein found in wheat, barley, and rye. Strict avoidance of gluten-containing foods is the mainstay of management.

Question 38Food and Nutrition

Which statement best explains why brown bread has a higher fibre content than white bread?

  1. Brown bread is baked at a higher temperature.
  2. Brown bread retains more of the bran from the wheat grain. Correct answer.
  3. Brown bread is made from a different cereal that has no fibre.
  4. Brown bread contains added sugar.

Explanation

Wholemeal and brown flours retain more of the bran layer, which is rich in fibre, whereas white flour is refined and much of the bran is removed. This explains the higher fibre content of brown bread.

Question 39Food and Nutrition

A family replaces butter with a polyunsaturated margarine spread. Which nutritional change is most likely?

  1. A reduction in saturated fat and an increase in unsaturated fat Correct answer.
  2. A reduction in total fat to zero
  3. An increase in saturated fat intake
  4. An increase in cholesterol intake

Explanation

Polyunsaturated margarine contains less saturated fat and more unsaturated fat than butter, which is largely saturated. This swap is recommended to help lower saturated fat intake.

Question 40Food and Nutrition

Which factor would most increase the risk of food poisoning from a chicken dish?

  1. Reheating the chicken thoroughly before serving
  2. Cooling the cooked chicken quickly and refrigerating it
  3. Cooking the chicken to a safe internal temperature
  4. Leaving the cooked chicken at room temperature for several hours Correct answer.

Explanation

Leaving cooked chicken in the temperature danger zone allows bacteria such as Salmonella and Campylobacter to multiply rapidly. Prompt cooling and refrigeration limit this growth.

Question 41Food and Nutrition

Which statement best explains why vitamin C is easily lost during food preparation?

  1. It is water soluble and sensitive to heat and oxygen. Correct answer.
  2. It is fat soluble and leaches into fat.
  3. It is stable at high temperatures and in alkaline conditions.
  4. It is only found in animal foods.

Explanation

Vitamin C dissolves in water, so it leaches into cooking liquid, and it is destroyed by heat, oxygen, and alkaline conditions. This is why quick cooking methods and minimal water help retain it.

Question 42Food and Nutrition

A vegetarian meal combines rice and lentils. Which nutritional benefit does this combination provide?

  1. It eliminates all fat from the meal.
  2. It supplies complementary amino acids to improve protein quality. Correct answer.
  3. It removes the need for any iron in the diet.
  4. It provides vitamin B12 in large amounts.

Explanation

Cereals are low in lysine while pulses are low in methionine, so combining them provides a better balance of essential amino acids. This improves the overall protein quality of the meal.

Question 43Food and Nutrition

Which statement best explains why a high-fibre meal can help with weight management?

  1. Fibre increases satiety and slows the rate of digestion. Correct answer.
  2. Fibre provides more energy per gram than fat.
  3. Fibre is converted directly into muscle tissue.
  4. Fibre prevents the absorption of all nutrients.

Explanation

Fibre adds bulk, slows digestion, and promotes feelings of fullness, which can reduce overall energy intake. It also contributes little energy itself, making it useful in weight management.

Question 44Food and Nutrition

A student observes that a pastry becomes crisp when baked but softens after cooling in a humid room. Which explanation is most likely?

  1. The fat in the pastry melted completely.
  2. The pastry absorbed moisture from the air. Correct answer.
  3. The pastry lost its gluten network.
  4. The protein in the flour broke down into sugar.

Explanation

Crispness depends on low moisture content, so a humid environment allows the pastry to absorb water from the air and become soft. Reheating can drive off moisture and restore some crispness.

Question 45Food and Nutrition

Which change to a recipe would most effectively reduce the glycaemic impact of a potato salad?

  1. Removing the skin before cooking
  2. Serving the potatoes very hot
  3. Mashing the potatoes finely
  4. Adding vinegar and cooling the potatoes before serving Correct answer.

Explanation

Cooling cooked potatoes increases resistant starch formation, and adding acid such as vinegar slows gastric emptying and starch digestion. Together these lower the glycaemic response compared with hot, freshly mashed potato.

Question 46Food and Nutrition

A product contains 6 g of fibre per 100 g. Using the typical threshold of 3 g per 100 g for a 'source of fibre' claim, which statement is correct?

  1. It meets the threshold and can be described as a source of fibre. Correct answer.
  2. It meets the threshold only if it is a cereal product.
  3. It falls below the threshold and cannot make the claim.
  4. It meets the threshold only if it is also low in sugar.

Explanation

A fibre content of 6 g per 100 g exceeds the typical 3 g per 100 g threshold for a 'source of fibre' claim. The claim depends on the nutrient content rather than the type of food.

Question 47Food and Nutrition

Which explanation best accounts for the Maillard reaction producing a brown crust on baked bread?

  1. Sugars caramelise in the presence of water.
  2. Fat oxidises and darkens the surface.
  3. Amino acids and reducing sugars react at high temperature. Correct answer.
  4. Starch gelatinises and turns brown.

Explanation

The Maillard reaction occurs between amino acids and reducing sugars at high temperature, producing brown pigments and characteristic flavours. It requires a relatively dry surface and sufficient heat, which is why it occurs on the crust.

Question 48Food and Nutrition

A cook wants to set a fruit jelly made from fresh pineapple. Which explanation best accounts for the difficulty?

  1. Fresh pineapple contains too much pectin.
  2. Fresh pineapple is too acidic for gelatin to set.
  3. Fresh pineapple contains no water for the gelatin to absorb.
  4. Fresh pineapple contains an enzyme that breaks down gelatin. Correct answer.

Explanation

Fresh pineapple contains bromelain, a protease that digests the protein in gelatin, so the jelly fails to set. Heating the fruit first denatures the enzyme and allows the gelatin to set normally.

Question 49Food and Nutrition

Which statement best explains why a low-fat spread may contain more water than butter?

  1. Water is added to replace some of the fat phase in the emulsion. Correct answer.
  2. Water is added to increase the fat content.
  3. Water is added to prevent the spread from melting.
  4. Water is produced when fat is removed.

Explanation

In reduced-fat spreads, water is incorporated into the emulsion to replace part of the fat phase while maintaining a spreadable texture. This lowers the energy content per gram compared with butter.

Question 50Food and Nutrition

A student compares two loaves made from the same recipe: one baked in a fan oven at 180 °C and one in a conventional oven at 180 °C. The fan-oven loaf browns much faster. Which explanation best accounts for this difference?

  1. The fan oven produces steam that reacts with the flour proteins to darken the crust.
  2. The fan oven heats the dough only from below, concentrating heat on the base of the loaf.
  3. The fan oven lowers the internal temperature of the dough, slowing starch gelatinisation.
  4. The fan oven removes moisture from the dough surface more quickly, so the surface dries and browns sooner. Correct answer.

Explanation

In a fan oven, forced air increases heat transfer at the surface of the dough and carries moisture away faster. A drier surface reaches the temperatures needed for the Maillard reaction and caramelisation sooner, so the crust browns earlier. This is why fan ovens are usually set 10–20 °C lower than conventional ovens.