Maharashtra HSC Multi-Skill Food Processing (NSQF) common mistakes
Maharashtra HSC Multi-Skill Food Processing (NSQF) · Understand the traps and how to avoid them.
In a short answer, writes that pasteurisation is done at 121°C for 15 minutes, or states that pasteurised milk is sterile.
General science teaching equates 'heat treatment' with 'sterilisation', and home boiling of milk makes any high temperature seem correct; candidates recall one sterilisation figure and apply it to every heat process.
What to do instead
Memorise a process table by target, not by name: pasteurisation 63°C/30 min or 72°C/15 s (pathogens destroyed, product still needs cold storage); UHT 135–150°C for 2–5 s plus aseptic packing (commercially sterile); retort sterilisation 121°C/15 min. Write the storage condition beside each row.
Marks every hygiene step-hand washing, pest control, cleaning-as a Critical Control Point (CCP) in a HACCP flow diagram.
CCP sounds like 'important hygiene point', so candidates list good practices instead of applying the Codex definition and decision tree; GMP/prerequisite programmes and CCPs get blurred.
What to do instead
Test each step with two questions: is there a hazard here that can be prevented, eliminated or reduced to an acceptable level, and if control is lost, can a later step fix it? If no, it is a prerequisite/GMP, not a CCP. Practise the CCP decision tree on a simple milk or pickle flow chart.
Says homogenisation kills bacteria or pasteurises milk, and lists it as a preservation step in the dairy flow chart.
Homogenisation and pasteurisation are taught in the same dairy unit and both involve machines and pressure or temperature; the words are memorised as a pair without their functions.
What to do instead
Draw the two mechanisms: homogenisation = high-pressure forcing through a small valve to break fat globules (prevents cream layer, improves stability; no microbial kill); pasteurisation = heat treatment. Place homogenisation after pasteurisation in the flow chart, not instead of it.
On a label question, lists only 'product name, price, manufacturing date' and omits batch number, net quantity, nutritional information, veg/non-veg mark, allergen declaration or FSSAI licence number.
Candidates recall labels from packaged snacks they see, not the mandatory list in the FSSAI Labelling and Display Regulations; they confuse voluntary marketing information with statutory declarations.
What to do instead
Build a 12-item checklist and apply it to three different products: name, ingredients, nutrition, veg/non-veg, net quantity, batch/lot, mfg date, best-before/expiry, manufacturer/packer address, FSSAI logo and licence number, storage instructions, allergen declaration. For each, note why it matters to the consumer.
Defines blanching only as 'killing microorganisms' or 'cooking the vegetable', and misses enzyme inactivation in fruit and vegetable processing answers.
Blanching is a mild heat step, so candidates lump it with sterilisation or cooking; the enzyme browning example in apple or potato is not connected to the process.
What to do instead
Write the purpose as a five-point list: inactivate peroxidase and polyphenol oxidase, fix colour and flavour, remove tissue gases, soften skin for peeling, reduce surface microbial load. State clearly that it is not sterilisation and is usually followed by cooling.
Says wheat bran is the main ingredient of maida, or describes ghani extraction as solvent extraction; cannot match wheat kernel parts to milling streams.
The kernel diagram and oil extraction methods are studied as separate diagrams; candidates memorise labels without linking bran, germ and endosperm to products or mechanical and solvent methods to their solvents.
What to do instead
Draw and label the wheat kernel, then write the product from each part: endosperm→maida/semolina, bran→bran, germ→germ oil. For oil, make two columns: mechanical (ghani/expeller, no solvent) and solvent (hexane, higher yield). Test yourself by matching five by-products to their source.
Stores fresh fish at 10°C, thaws frozen chicken on the kitchen counter, or says rigor mortis immediately makes meat tender.
Domestic refrigerator temperatures and room-temperature thawing are everyday habits; the exam's commercial cold-chain values and the rigor-to-aging sequence are not practised.
What to do instead
Memorise cold-chain cards: chilled meat/fish 0–4°C, frozen -18°C or lower, thaw in the refrigerator or under cold running water, never at room temperature. Sequence rigor mortis: muscle stiffens, then resolves during aging, which improves tenderness; do not reverse the order.
Calls oxidative rancidity 'bacterial spoilage', or says every swollen can is caused by microorganisms.
Spoilage is taught as a single 'food goes bad' topic; candidates use 'bacteria' as a default cause and do not separate chemical, enzymatic and physical changes.
What to do instead
Classify with examples: microbial (slime, mould, gas), enzymatic (browning in cut fruit), chemical (oxidative rancidity in oil, hydrogen swelling in canned acidic foods), physical (staling, moisture migration). For each, write one control: antioxidant or nitrogen flushing, blanching, low temperature, proper canning.
Uses baking soda as a direct 1:1 substitute for baking powder in a cake or bread answer, or says both are the same leavening agent.
Both are white powders used in baking and both release carbon dioxide; candidates remember 'baking soda/powder' as a pair without the acid component or the starch buffer.
What to do instead
Write the composition: baking soda = sodium bicarbonate only, needs an acid (curd, lemon, buttermilk) plus heat; baking powder = bicarbonate + acid salt + starch, releasing CO2 in two stages if double-acting. State why 1:1 substitution fails (off taste, poor rise) and where yeast fermentation fits.
Reports percentage yield as '100 kg output' without dividing by input, or calculates moisture loss on the final weight instead of the initial weight; confuses BOD with total solids.
Formulae are treated as definitions to recite, not calculations to practise; the denominator and units are skipped under exam time pressure.
What to do instead
Practise with numbers: % yield = (final product weight ÷ raw material input weight) × 100; % moisture = (weight loss on drying ÷ initial sample weight) × 100. Write units each time. Keep BOD (oxygen consumed by microorganisms) and COD (oxygen consumed by chemical oxidants) on separate flash cards with one example each.