1. What is operating system?

Answer. collection of programs that manages hardware resources, system service provider to the application programs, link to interface the hardware and application programs

2. To access the services of operating system, the interface is provided by the ?

Answer. System calls

3. kernel is made of various modules which can not be loaded in running operating system true or false?

Answer. False

4. Which one of the following error will be handle by the operating system?
• power failure
• lack of paper in printer
• connection failure in the network

Answer.
• power failure
• lack of paper in printer
• connection failure in the network

5. What is the main function of the command interpreter?

Answer. to get and execute the next user-specified command

6. What are the two steps of a process execution?

Answer. CPU & I/O Burst

7. An I/O bound program will typically have

Answer. many very short CPU bursts

8. A process is selected from the queue by the scheduler, to be executed.

Answer. ready, short term

9. In the following cases non - preemptive scheduling occurs?

Answer. When a process goes from the running state to the waiting state

10. The switching of the CPU from one process or thread to another is called

Answer. process switch

11. What is Dispatch latency?

Answer. the time to stop one process and start running another one

12. With ............... only one process can execute at a time; meanwhile all other process are waiting for the processor. With more than one process can be running simultaneously each on a different processor.

Answer. Uniprogramming, Multiprocessing

13. In UNIX, each process is identified by its

Answer. Process Identifier

14. In UNIX, the return value for the fork system call is ............ for the child process and ............ for the parent process.

Answer. Zero, A nonzero integer

15. The child process can be a duplicate of the parent process true or false ?

Answer. true

16. The child process completes execution, but the parent keeps executing, then the child process is known as ?

Answer. Zombie

17. What is Inter process communication ?

Answer. allows processes to communicate and synchronize their actions without using the same address space