Maharashtra HSC IT (Arts) common mistakes
Maharashtra HSC IT (Arts) · Understand the traps and how to avoid them.
When asked to convert between number systems, candidates write the remainders of successive division in the order produced instead of reading them bottom-to-top, so decimal 13 becomes 1011 instead of 1101.
The division-by-2 method is memorised as a procedure without understanding place value; candidates rush the final step because the arithmetic already feels finished.
What to do instead
After every conversion, verify by expanding the result back into powers of 2 (1×8 + 1×4 + 0×2 + 1×1 = 13). Practise five conversions per session and always reverse the remainder column deliberately, marking the last remainder as the most significant bit.
Candidates label a ROM chip as volatile or state that RAM retains data after power-off, and they confuse the roles of cache, RAM and secondary storage when describing the memory hierarchy.
Everyday language treats 'memory' and 'storage' as synonyms, and revision notes often list memory types as a flat list without the volatile/non-volatile distinction attached to each.
What to do instead
Build a two-column table (volatile / non-volatile) and place every device in it, then add a speed-and-cost ordering: registers, cache, RAM, SSD, HDD, optical, tape. For each row write one sentence on what happens to the data when power is removed.
In file-management questions, candidates give a file name without its extension or write a path with the wrong separator, and they cannot distinguish a folder from a drive or explain what a file extension controls.
In graphical file managers the extension is often hidden and paths are clicked rather than typed, so the underlying structure is never practised.
What to do instead
Turn on file-extension display and practise writing full paths by hand, e.g. D:\Projects\report.docx. For ten common extensions (.docx, .xlsx, .pptx, .pdf, .jpg, .mp3, .exe, .txt, .csv, .html) state the program that opens it and whether it is text or binary.
Candidates describe formatting as content: they claim that making text bold changes the words, or they cannot say which view (print layout, web layout, outline, draft) shows headers, footers and page breaks.
Formatting is applied by clicking icons during practice, so the separation between character formatting, paragraph formatting and page setup is never articulated.
What to do instead
For each feature write one line saying what it changes and where it appears: font size (characters), alignment (paragraph), margins and orientation (page), header/footer (section). Then switch through every view in the word processor and note what becomes visible or hidden in each.
When a spreadsheet question gives a formula and asks for the result, candidates copy the formula to a new cell without adjusting relative references, or they write =A1+B1 where =SUM(A1:B1) is required, and they misread absolute references such as $A$1.
The difference between relative and absolute referencing is taught as syntax rather than behaviour, and candidates rarely test what happens when a formula is filled down.
What to do instead
Create a small sheet with a value in A1 and a formula in B1, then fill down and observe which references shift. Repeat with $A$1 and A$1. Write out in words what each of the four reference styles does before attempting exam questions.
Candidates build a chart or slide deck that is technically complete but unreadable: pie charts with twelve slices, three-dimensional bars that distort comparison, or slides carrying a full paragraph in a small font.
Assessment practice focuses on inserting the object rather than on choosing the right object, and candidates equate more decoration with better marks.
What to do instead
Apply a rule-based check: pie charts only for parts of one whole with six or fewer slices, bar charts for comparison, line charts for trends over time. For slides, cap body text at about six bullet lines of six words and state the message of each slide in its title.
In email and web-browsing questions, candidates confuse To, Cc and Bcc, cannot explain what a URL's parts mean, or state that a search engine stores the full text of every page it can find.
These features are used casually without ever being described, and the mental model of the web is built from the user interface rather than from how indexing and retrieval work.
What to do instead
Write a one-line definition for To (primary recipient), Cc (visible copy), Bcc (hidden copy) with a use case for each. Break three real URLs into protocol, domain, path and query string. Explain crawling, indexing and ranking in three sentences each.
Candidates mix up network hardware and topologies: they call a switch a router, say a hub directs traffic intelligently, or claim the internet and the World Wide Web are the same thing.
The devices sit in the same box in a home router, so their distinct jobs are invisible; the terms are also learned as vocabulary lists without a diagram.
What to do instead
Draw one labelled diagram of a small network containing a modem, router, switch, hub, access point and five clients. Beside each device write its layer of operation and one sentence on what it does with an incoming frame or packet. Separately state the internet-versus-web distinction in one sentence each.
In database questions, candidates write a query that returns rows but not the requested columns, forget the WHERE clause so all rows appear, or confuse a primary key with a foreign key and SELECT with UPDATE.
SQL is practised by copying worked examples rather than by translating a plain-English requirement into clauses, and keys are memorised as definitions without a relationship to look at.
What to do instead
For every practice query, first underline the requested output columns, then the table, then the filter condition, and only then write SELECT ... FROM ... WHERE ... in that order. Build two small related tables and mark the primary key in one and the matching foreign key in the other.
On cyber-safety items, candidates describe phishing only as 'a fake email', cannot distinguish a virus from a worm or Trojan, and treat a strong password as one with symbols only rather than length and uniqueness.
Awareness material is absorbed as slogans, so answers restate warnings instead of naming the mechanism and the correct response.
What to do instead
For each threat (virus, worm, Trojan, ransomware, phishing, pharming, spyware) write how it spreads, what it does and the single best defence. For password questions, state the three criteria (length, unpredictability, uniqueness per site) and give a concrete response to a suspicious link: do not click, verify the sender through a separate channel, report it.