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ESIC UDC: Computer Knowledge / Computer Literacy for ESIC UDC

ESIC UDC · Work through your exam, one topic at a time.

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Computer Knowledge / Computer Literacy for ESIC UDC

Computer Knowledge in ESIC UDC covers hardware and software basics, memory, operating systems, MS Office, internet and networking, database concepts, cyber security and keyboard shortcuts. Questions are usually direct but depend on precise distinctions.

Core rules to apply

  • Primary memory: RAM is volatile and loses data on power-off; ROM is non-volatile. Secondary storage includes hard disks, SSDs and pen drives.
  • 1 byte = 8 bits; 1 KB = 1024 bytes; 1 MB = 1024 KB; 1 GB = 1024 MB.
  • In Windows, Ctrl+C copies, Ctrl+X cuts, Ctrl+V pastes, Ctrl+Z undoes and Ctrl+Shift+N creates a new folder in File Explorer.
  • In Excel, a colon denotes a range: B2:B10 includes B2 and B10. A formula begins with "=".
  • HTTPS uses encryption; HTTP does not. Phishing tricks users into revealing credentials through fake messages or sites.

Worked example

A pen drive is labelled 32 GB. How many MB is that? Using 1 GB = 1024 MB, 32 × 1024 = 32,768 MB. The reasoning is to apply the binary storage conversion, not the decimal 1000 multiplier. If the question asks for bits, multiply further by 8.

Traps that cost marks

  • Confusing RAM with ROM, or calling RAM permanent storage.
  • Mixing MB (megabyte) with Mb (megabit).
  • Confusing Ctrl+S (save) with Ctrl+Shift+S (Save As).
  • Treating a spreadsheet range as excluding the last cell.
  • Calling spam a virus; spam is unsolicited bulk mail, while a virus is malicious code that replicates.