Sample Subjective Questions on Computer Science for Exams

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Q1. What is an Operating System?

Ans.

  • An Operating System is a program that manages the computer hardware.
  • It acts as an intermediate between a user of a computer and the computer hardware.
  • It controls and coordinates the use of the hardware among the various application programs for the various users.

Q2. How can a user program disturb the normal Operation of the system?

Ans.

  • Issuing illegal I/O Operation.
  • By accessing memory locations within the OS, itself.
  • Refusing to relinquish the CPU.

Q3. What do you mean by system calls?

Ans.

  • System calls provide the interface between a process and the Operating System, when a system call is executed.
  • It is treated as by the hardware as software interrupt.

Q4. What is scheduler?

Ans.

  • A process migrates between the various scheduling queues through out its life time.
  • The OS must select processes from these queues in some fashion.
  • This selection process is carried out by a scheduler.

Q5. What is co-operative process?

Ans.

  • A process is co-operating if it can affect or be affected by the other processes executing in the system.
  • Any process that share data with other process is a co-operating process.

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