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Official PYQ · 1999Q1.9Memory Management and Virtual MemoryMCQ1 mark

GATE CS 1999 Q1.9 — Memory Management and Virtual Memory

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Listed below are some operating system abstractions (in the left column) and the hardware components (in the right column)(A)Thread1.Interrupt(B)Virtual address space2.Memory(C)File system3.CPU(D)Signal4.Disk\small \begin{array}{|cl|cl|}\hline \text{(A)}& \text{Thread} & \text{1.}& \text{Interrupt} \\ \hline \text{(B)}& \text{Virtual address space} & \text{2.}& \text{Memory} \\ \hline \text{(C)} &\text{File system} & \text{3.} &\text{CPU} \\ \hline \text{(D)} &\text{Signal} & \text{4.}& \text{Disk} \\ \hline \end{array}

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Answer: C

To find the correct mapping, we match each operating system abstraction to its corresponding underlying hardware component:

  • (A) Thread → 3. CPU
    A thread is the smallest unit of execution scheduled by the operating system. It represents a flow of control that runs directly on the CPU.
  • (B) Virtual address space → 2. Memory
    The virtual address space is a high-level abstraction managed by the OS and MMU to provide each process with its own isolated view of the physical Memory (RAM).
  • (C) File system → 4. Disk
    A file system organizes data into files and directories, abstracting away the raw block-level storage of a persistent storage device like a Disk.
  • (D) Signal → 1. Interrupt
    A signal is an asynchronous notification sent to a process to inform it of an event. It is the software equivalent of a hardware Interrupt.

This gives the mapping: (A) – 3, (B) – 2, (C) – 4, (D) – 1, which corresponds to Option C.

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