Basic Computer Knowledge and Awareness
Basic Computer Knowledge and Awareness tests hardware, software, operating systems, office applications, internet use, networking and cyber safety. Questions are factual and often ask about shortcuts, file types, memory and common security threats.
Fundamentals
- Hardware: CPU processes instructions; RAM is volatile working memory; ROM is non-volatile; hard disks and SSDs are secondary storage.
- Software: system software includes the operating system; application software includes word processors and browsers.
- Units: 1 byte = 8 bits; 1 KB = 1024 bytes; 1 MB = 1024 KB.
- Shortcuts: Ctrl+C copy, Ctrl+X cut, Ctrl+V paste, Ctrl+Z undo, Ctrl+Y redo, Ctrl+S save, Ctrl+P print, Alt+Tab switch windows.
Internet and security
A URL identifies a web resource; HTTPS encrypts traffic between browser and server. Phishing tricks users into revealing passwords or OTPs. Malware includes viruses, worms and ransomware. A firewall filters network traffic. Use strong, unique passwords and never share an OTP.
Worked example
Convert binary 1011₂ to decimal. Write place values from the right: 1, 2, 4, 8. Multiply: 1×8 + 0×4 + 1×2 + 1×1 = 8 + 0 + 2 + 1 = 11. The answer is 11.
Traps
- Confusing RAM with ROM: RAM loses data on power-off.
- Mixing bit and byte.
- Treating “Save As” as identical to “Save”; Save As creates a new file or format.
- Assuming a padlock icon alone guarantees a trustworthy site.
- Confusing primary memory with secondary storage.
For police-related computer questions, also note that e-FIR, CCTV footage and cybercrime portals involve digital evidence handling.