BSCS Bachelor of Science in Computer Science: Operating Systems Concepts 3

Question 1

Which inter-process communication (IPC) mechanism allows processes to communicate by writing to and reading from a shared region of memory?

Accepted Answer

Shared memory

Answer

Shared memory IPC maps the same physical memory into the address spaces of multiple processes, enabling direct data exchange without kernel involvement on each read/write.

Question 2

In a segmentation memory model, a segment table entry typically contains:

Accepted Answer

A base address and a limit (length) for the segment

Answer

Each segment table entry holds the base physical address where the segment starts and a limit that enforces the segment's size boundary.

Question 3

What distinguishes a daemon process from a regular user process in Unix/Linux?

Accepted Answer

Daemons run in the background without a controlling terminal

Answer

A daemon is a background process detached from any terminal, typically started at boot and running continuously to provide system services.

Question 4

The working set model in virtual memory is primarily used to:

Accepted Answer

Estimate the number of pages a process actively uses in a time window

Answer

The working set model tracks the set of pages a process has referenced within a recent time window to guide frame allocation and prevent thrashing.

Question 5

In POSIX, which system call creates a new process that is an exact copy of the calling process?

Accepted Answer

fork()

Answer

fork() creates a child process with a copy-on-write duplicate of the parent's address space, file descriptors, and state.

BSCS - Bachelor of Science in Computer Science Practice Test

BSCS - Bachelor of Science in Computer Science Practice Test

BSCS Bachelor of Science in Computer Science: Operating Systems Concepts 3