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CPU, Memory & Storage MCQs 2026

45 questions with detailed answers · 19 from past papers · 5 quiz batches available

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Read each question, think about the answer, then click Show Answer to reveal the correct option and explanation. Load 10 at a time so it stays manageable — perfect for one-topic study sessions on the bus or during a break.

Page 1 of 1Questions 1–10 of 45
  1. Q1medium

    The control bus is used to carry

    1. AData only
    2. BAddresses only
    3. CPower
    4. DControl and timing signals
    💡 Explanation:

    The control bus carries control and timing signals between components.

  2. Q2easy

    Which of the following is generally faster

    1. AHard disk
    2. BDVD
    3. CSSD
    4. DMagnetic tape
    💡 Explanation:

    An SSD is faster than hard disks, DVDs and magnetic tape.

  3. Q3medium

    An SSD stores data on

    1. ASpinning platters
    2. BFlash memory chips
    3. CMagnetic tape
    4. DOptical discs
    💡 Explanation:

    SSDs store data on flash memory chips rather than spinning platters.

  4. Q4hard

    The Instruction Register (IR) holds

    1. AThe next address
    2. BALU results
    3. CMemory data
    4. DThe current instruction being executed
    💡 Explanation:

    The Instruction Register holds the instruction currently being executed.

  5. Q5easy

    Registers are located

    1. AInside the CPU
    2. BOn the hard disk
    3. CIn the monitor
    4. DIn the power supply
    💡 Explanation:

    Registers are small storage locations inside the CPU.

  6. Q6easy

    Which of the following has the largest storage capacity

    1. ACD
    2. BDVD
    3. CHard disk
    4. DFloppy disk
    💡 Explanation:

    Among these, the hard disk has by far the largest storage capacity.

  7. Q7Past Paper · PPSC/FPSC/NTSmedium

    DRAM is mainly used as

    1. ACache memory
    2. BMain memory
    3. CRegister
    4. DROM
    💡 Explanation:

    DRAM is used as the main memory (RAM) of a computer.

  8. Q8medium

    The time taken to locate and retrieve data from memory is called

    1. ABandwidth
    2. BClock speed
    3. CRefresh rate
    4. DAccess time
    💡 Explanation:

    Access time is the time required to locate and read data from memory.

  9. Q9medium

    Which memory type is faster

    1. ADRAM
    2. BBoth are equal
    3. CSRAM
    4. DNeither stores data
    💡 Explanation:

    SRAM is faster than DRAM, which is why it is used for cache.

  10. Q10Past Paper · PPSC/FPSC/NTSeasy

    The component containing the ALU and control unit is the

    1. ACPU
    2. BRAM
    3. CMotherboard
    4. DHard disk
    💡 Explanation:

    The CPU contains the ALU and the control unit.

  11. Q11medium

    Flash drives and SSDs are both examples of

    1. AVolatile memory
    2. BNon-volatile memory
    3. CCache memory
    4. DRegister memory
    💡 Explanation:

    Flash drives and SSDs are non-volatile; they retain data without power.

  12. Q12Past Paper · PPSC/FPSC/NTSmedium

    Which of these has the fastest data access time

    1. ADVD
    2. BHard disk
    3. CRAM
    4. DCache
    💡 Explanation:

    Cache has the fastest access time among these options.

  13. Q13Past Paper · PPSC/FPSC/NTSmedium

    The fastest type of memory in a computer is

    1. ARAM
    2. BHard disk
    3. CRegister
    4. DROM
    💡 Explanation:

    Registers, located inside the CPU, are the fastest memory in a computer.

  14. Q14medium

    Cache memory is placed between the CPU and

    1. AMain memory (RAM)
    2. BHard disk
    3. CMonitor
    4. DKeyboard
    💡 Explanation:

    Cache sits between the CPU and RAM to speed up data access.

  15. Q15Past Paper · PPSC/FPSC/NTSmedium

    Which memory is directly accessed by the CPU

    1. AHard disk
    2. BDVD
    3. CUSB drive
    4. DMain memory
    💡 Explanation:

    The CPU directly accesses primary (main) memory such as RAM.

  16. Q16medium

    DRAM needs to be constantly

    1. ACooled
    2. BRefreshed
    3. CFormatted
    4. DCleaned
    💡 Explanation:

    Dynamic RAM (DRAM) must be refreshed continuously to retain its data.

  17. Q17Past Paper · PPSC/FPSC/NTSeasy

    Which of the following is non-volatile memory

    1. ARAM
    2. BCache
    3. CROM
    4. DRegister
    💡 Explanation:

    ROM is non-volatile and retains data even when power is off.

  18. Q18medium

    PROM can be programmed

    1. AMultiple times
    2. BOnly once
    3. CNever
    4. DAutomatically
    💡 Explanation:

    PROM (Programmable ROM) can be written to only once by the user.

  19. Q19medium

    EPROM is erased using

    1. AElectricity
    2. BA magnet
    3. CWater
    4. DUltraviolet light
    💡 Explanation:

    EPROM (Erasable PROM) is erased by exposure to ultraviolet light.

  20. Q20medium

    EEPROM is erased using

    1. AElectrical signals
    2. BUV light
    3. CHeat
    4. DSound
    💡 Explanation:

    EEPROM (Electrically Erasable PROM) is erased and rewritten using electrical signals.

  21. Q21Past Paper · PPSC/FPSC/NTSeasy

    The main circuit board of a computer is called the

    1. ACPU
    2. BRAM
    3. CCache
    4. DMotherboard
    💡 Explanation:

    The motherboard is the main circuit board connecting all components.

  22. Q22hard

    Which register holds the address of the next instruction to be executed

    1. AAccumulator
    2. BMAR
    3. CProgram Counter
    4. DInstruction Register
    💡 Explanation:

    The Program Counter (PC) holds the address of the next instruction.

  23. Q23hard

    The register that stores intermediate results of the ALU is the

    1. AProgram Counter
    2. BAccumulator
    3. CMAR
    4. DInstruction Register
    💡 Explanation:

    The accumulator stores intermediate results produced by the ALU.

  24. Q24Past Paper · PPSC/FPSC/NTSmedium

    MAR stands for

    1. AMain Address Register
    2. BMemory Access Register
    3. CMultiple Address Register
    4. DMemory Address Register
    💡 Explanation:

    MAR stands for Memory Address Register, holding the address to be accessed.

  25. Q25easy

    The speed of the processor clock is measured in

    1. AGigahertz (GHz)
    2. BDPI
    3. CBytes
    4. DPixels
    💡 Explanation:

    Processor clock speed is measured in Gigahertz (GHz).

  26. Q26medium

    Which bus carries memory addresses in a computer

    1. AData bus
    2. BControl bus
    3. CAddress bus
    4. DPower bus
    💡 Explanation:

    The address bus carries the memory addresses being accessed.

  27. Q27medium

    The data bus is used to

    1. ACarry addresses
    2. BCarry actual data
    3. CControl timing
    4. DSupply power
    💡 Explanation:

    The data bus transfers the actual data between CPU and memory.

  28. Q28Past Paper · PPSC/FPSC/NTSmedium

    Which of the following is the smallest and fastest memory

    1. ARAM
    2. BHard disk
    3. CCache
    4. DRegister
    💡 Explanation:

    Registers are the smallest and fastest memory, located within the CPU.

  29. Q29easy

    Cache memory is ______ than main memory

    1. AFaster
    2. BSlower
    3. CLarger and cheaper
    4. DNon-electronic
    💡 Explanation:

    Cache memory is faster (but smaller and costlier) than main memory.

  30. Q30Past Paper · PPSC/FPSC/NTSeasy

    RAM is an example of

    1. ASecondary memory
    2. BPrimary memory
    3. CRead-only memory
    4. DBackup memory
    💡 Explanation:

    RAM is primary (main) memory used to hold data currently in use.

  31. Q31easy

    Which of the following is a secondary storage device

    1. ARAM
    2. BCache
    3. CHard disk
    4. DRegister
    💡 Explanation:

    A hard disk is a secondary storage device used for permanent storage.

  32. Q32Past Paper · PPSC/FPSC/NTSeasy

    The storage capacity of a standard CD is about

    1. A700 MB
    2. B4.7 GB
    3. C25 GB
    4. D128 MB
    💡 Explanation:

    A standard CD holds about 700 MB of data.

  33. Q33Past Paper · PPSC/FPSC/NTSmedium

    SRAM is commonly used as

    1. ACache memory
    2. BHard disk
    3. CVirtual memory
    4. DSecondary storage
    💡 Explanation:

    Static RAM (SRAM) is fast and is commonly used for cache memory.

  34. Q34Past Paper · PPSC/FPSC/NTSeasy

    The storage capacity of a standard single-layer DVD is about

    1. A700 MB
    2. B128 MB
    3. C25 GB
    4. D4.7 GB
    💡 Explanation:

    A single-layer DVD holds about 4.7 GB of data.

  35. Q35Past Paper · PPSC/FPSC/NTSmedium

    A single-layer Blu-ray disc can store about

    1. A700 MB
    2. B4.7 GB
    3. C25 GB
    4. D128 MB
    💡 Explanation:

    A single-layer Blu-ray disc holds about 25 GB.

  36. Q36Past Paper · PPSC/FPSC/NTSmedium

    Which storage device has no moving parts and uses flash memory

    1. AHard disk
    2. BSolid State Drive (SSD)
    3. CMagnetic tape
    4. DCD-ROM
    💡 Explanation:

    An SSD uses flash memory and has no moving mechanical parts.

  37. Q37medium

    Which of the following provides sequential access and is used for backups

    1. AMagnetic tape
    2. BSSD
    3. CRAM
    4. DCache
    💡 Explanation:

    Magnetic tape offers sequential access and is used for archival backups.

  38. Q38Past Paper · PPSC/FPSC/NTSmedium

    Virtual memory uses part of the ______ as an extension of RAM

    1. ACache
    2. BROM
    3. CRegister
    4. DHard disk
    💡 Explanation:

    Virtual memory uses hard disk space to act as extra RAM.

  39. Q39hard

    The correct order of memory from fastest to slowest is

    1. ARAM, Register, Cache, HDD
    2. BRegister, Cache, RAM, HDD
    3. CHDD, RAM, Cache, Register
    4. DCache, Register, RAM, HDD
    💡 Explanation:

    Speed order is Register, then Cache, then RAM, then Hard disk.

  40. Q40easy

    A USB flash drive stores data using

    1. AMagnetic disks
    2. BOptical technology
    3. CFlash memory
    4. DVacuum tubes
    💡 Explanation:

    USB flash drives use non-volatile flash memory to store data.

  41. Q41Past Paper · PPSC/FPSC/NTSeasy

    Primary memory is also known as

    1. ABackup memory
    2. BSecondary memory
    3. CExternal memory
    4. DMain memory
    💡 Explanation:

    Primary memory is also called main memory, directly used by the CPU.

  42. Q42medium

    The number of bits a CPU can process at one time is called its

    1. AWord length
    2. BClock speed
    3. CBandwidth
    4. DCache size
    💡 Explanation:

    Word length is the number of bits a CPU can process simultaneously.

  43. Q43Past Paper · PPSC/FPSC/NTSmedium

    L1, L2 and L3 are types of

    1. ARAM
    2. BROM
    3. CCache memory
    4. DHard disk
    💡 Explanation:

    L1, L2 and L3 are levels of cache memory.

  44. Q44Past Paper · PPSC/FPSC/NTSeasy

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

    1. AROM
    2. BRAM
    3. CFlash memory
    4. DHard disk
    💡 Explanation:

    RAM is volatile and loses its contents when power is removed.

  45. Q45easy

    A group of wires that transfers data between components is called a

    1. ABus
    2. BPort
    3. CRegister
    4. DSlot
    💡 Explanation:

    A bus is a set of wires that transfers data between computer components.

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