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Computer basics MCQs

PPSC / FPSC / NTS · Computer · 6 questions

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Revision summary

Computer MCQs in job tests cover hardware, memory, number systems, shortcuts and the internet. The CPU (central processing unit) is the brain: it carries out instructions. Memory is primary (RAM, which is volatile and loses its contents without power, and ROM, which keeps them) or secondary (hard disks, SSDs, flash drives). Storage sizes: 1 byte = 8 bits; 1 KB = 1,024 bytes, then MB, GB and TB, each 1,024 times larger. Binary uses only 0 and 1; convert by place values 8, 4, 2, 1 (so 10 is 1010 and 7 is 0111). Common shortcuts: Ctrl + C copy, Ctrl + X cut, Ctrl + V paste, Ctrl + Z undo, Ctrl + Y redo, Ctrl + S save, Ctrl + P print. Internet terms: HTTP is the HyperText Transfer Protocol and HTTPS its secure form; a URL is a web address; an IP address identifies a device on a network. Learn abbreviations in full, because options often change one word.

Questions with answers

Written by Parcha from the syllabus. Samples until a subject reviewer checks them; report anything wrong from the practice screen.

  1. Q1 · Parcha original · Sample

    Which type of memory loses its contents when the power is switched off?

    • A. ROM
    • B. Hard disk
    • C. RAM
    • D. Flash drive
    Show answer

    Answer: C. RAM

    RAM (random access memory) is volatile: it holds running programs and data only while powered. ROM, hard disks and flash drives keep data without power (non-volatile).

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  2. Q2 · Parcha original · Sample

    One byte is equal to:

    • A. 4 bits
    • B. 8 bits
    • C. 16 bits
    • D. 1024 bits
    Show answer

    Answer: B. 8 bits

    A byte is 8 bits. A kilobyte is 1,024 bytes (in the binary convention).

  3. Q3 · Parcha original · Sample

    The binary form of the decimal number 10 is:

    • A. 1100
    • B. 1001
    • C. 1110
    • D. 1010
    Show answer

    Answer: D. 1010

    10 = 8 + 2 = (1 × 8) + (0 × 4) + (1 × 2) + (0 × 1), which is 1010 in binary.

  4. Q4 · Parcha original · Sample

    Which part is often called the "brain" of the computer?

    • A. CPU
    • B. Monitor
    • C. Keyboard
    • D. Power supply
    Show answer

    Answer: A. CPU

    The CPU (central processing unit) carries out program instructions and does the calculations, so it is called the brain of the computer.

  5. Q5 · Parcha original · Sample

    In most Windows programs, the keyboard shortcut to undo the last action is:

    • A. Ctrl + Y
    • B. Ctrl + X
    • C. Ctrl + Z
    • D. Ctrl + U
    Show answer

    Answer: C. Ctrl + Z

    Ctrl + Z undoes the last action. Ctrl + Y usually redoes it, Ctrl + X cuts, and Ctrl + U underlines in word processors.

  6. Q6 · Parcha original · Sample

    HTTP stands for:

    • A. High Transfer Text Process
    • B. HyperText Transfer Protocol
    • C. Hyperlink Text Transmission Program
    • D. Home Tool Transfer Protocol
    Show answer

    Answer: B. HyperText Transfer Protocol

    HTTP is the HyperText Transfer Protocol, the rule set browsers and web servers use to exchange web pages. HTTPS is its encrypted form.