Food Safety Officer (SR for SC/ST) — Kerala PSC PYQ Practice with Answers

Correct answer (Option C):\nLyophilization, commonly known as freeze-drying, is a premier food preservation method. The process operates by rapidly freezing the material and then reducing the surrounding pressure to allow the frozen water in the material to sublime directly from the solid phase to the gas phase. This vacuum dehydration preserves the structural integrity and nutritional profile of food. Option C is correct.\n\nWhy others are wrong:\nOption A involves traditional drying combined with freezing but not sublimation under vacuum. Option B is used for long-term cell preservation at ultra-low temperatures without structural dehydration. Option D refers to preservation using ionizing radiation rather than dehydration patterns.\n\nRemember:\nLyophilization is heavily relied upon for high-value food items like instant coffee and military rations because it retains optimal flavor and texture.

Correct answer (Option B):\nSauerkraut is a finely cut raw cabbage product that has been fermented by various lactic acid bacteria. The traditional chemical profile of properly cured sauerkraut consists of approximately 2-3% salt paired with an acidity level of >1.5% Lactic acid. This specific acidic environment prevents spoilage and establishes its characteristic sour flavor profile. Option B is correct.\n\nWhy others are wrong:\nOption A is incorrect because the concentration of lactic acid must rise above 1.5% to preserve the cabbage. Options C and D are incorrect because the primary fermentation product of sauerkraut is lactic acid, not acetic acid.\n\nRemember:\nThe primary bacteria responsible for the fermentation cascade in sauerkraut production are Leuconostoc mesenteroides and Lactobacillus plantarum.

Correct answer (Option D):\nA holoenzyme represents a fully functional, catalytically active enzyme system. It is structurally comprised of an apoenzyme, which is the heat-labile protein component, combined with a co-factor or co-enzyme, which forms the vital non-protein segment required for chemical catalysis. Option D is correct.\n\nWhy others are wrong:\nOption A defines only the protein portion of the enzyme system, which remains inactive on its own. Option B represents only the non-protein helper part rather than the entire system. Option C is too generic to specify the combined active form.\n\nRemember:\nMany metabolic enzymes require vitamin derivatives or trace mineral metal ions as their non-protein parts to operate as functional holoenzymes.

Correct answer (Option B):\nAccording to food processing standards, fruit squash must maintain a specific concentration of soluble solids to ensure preservation and flavor intensity. The Total Soluble Solids (TSS) content mandated for a standard fruit squash formulation is between 40-50%. This balanced sugar concentration is crucial for preserving quality when diluted for consumption. Option B is correct.\n\nWhy others are wrong:\nOption A specifies a higher sugar concentration typical of heavier syrups, fruit cordials, or jams. Options C and D describe low concentrations that align with raw unconcentrated juices or simple ready-to-serve beverages rather than squash.\n\nRemember:\nFruit squash regulations also require a minimum fruit juice content of 25% along with prescribed limits for chemical preservatives like sulfur dioxide.

Correct answer (Option C):\nAdvantame is an ultra-high-potency, non-nutritive artificial sweetener approved by the FDA for food use. It is a derivative of aspartame and vanillin that exhibits incredible stability under high heat profiles. Because it is approximately 20,000 times sweeter than sucrose (table sugar), it is used in minuscule amounts in consumer products. Option C is correct.\n\nWhy others are wrong:\nOption A is roughly 300–400 times sweeter than sugar. Option B provides a sweetening factor around 200 times sweeter. Option D represents a chlorinated sugar derivative that is approximately 600 times sweeter than standard sucrose.\n\nRemember:\nAdvantame is highly valued in food manufacturing because it lacks the bitter or metallic aftertaste associated with some older generation artificial sweeteners.