COPA Trade Theory: Hardware, Memory, Office Suite and Internet Basics
What the paper asks
Trade Theory for COPA (Computer Operator and Programming Assistant) in the CITS/AICET entrance test checks whether you understand why a computer behaves as it does: hardware building blocks, the memory hierarchy, operating-system duties, office-suite behaviour, internet and email protocols, and the cyber-safety rules behind daily operations. Items are definitional and comparative ("which memory is volatile", "which protocol sends mail"), so exact terminology scores and long explanations do not.
Core rules to carry in
- Memory order: registers, then cache, then RAM, then secondary storage. RAM is volatile; ROM and flash retain contents without power.
- Capacity: 1 byte = 8 bits; 1 KB = 1024 B; 1 MB = 1024 KB; 1 GB = 1024 MB; 1 TB = 1024 GB.
- Number systems: binary (2), octal (8), decimal (10), hexadecimal (16, digits 0-9 and A-F). Binary to hex is a 4-bit grouping; other conversions route through decimal.
- OS duties: process management, memory management, file system, device drivers, user interface, access control.
- Internet: DNS maps names to IP addresses; HTTP uses port 80, HTTPS 443; SMTP sends, POP3 and IMAP receive.
Worked example
Convert 1101 in base 2 to decimal and to hexadecimal. Binary place values from the right are 1, 2, 4, 8, so 1101 = 1x8 + 1x4 + 0x2 + 1x1 = 13. For hex, group four bits from the right: 1101 becomes D. Answer: 13 decimal, D hexadecimal.
Marks lost here
- bit versus Byte: a 100 Mbps line delivers about 12.5 MB/s, not 100 MB/s.
- 1024-based prefixes versus 1000-based marketing figures on drive labels.
- Save (overwrites) versus Save As (creates a new copy).
- Mixing SMTP with IMAP or POP3.
- Calling ROM volatile or confusing cache with RAM.