Operatin System questions. please solve them

11 (Choose only one answer) A set of processes is deadlocked if ed Select one: out of O a. each process is terminated O b. all processes are trying to kill each other O c. each process is blocked and will remain so forever O d. none of the mentioned 12 (Choose only one answer) In an operating system, each process has its own out of Select one: O a. pending alarms, signals and signal handlers O b. all of the mentioned O c. address space and global variables O d. open files 13 (Choose only one answer) In the round robin scheduling algorithm in a time shared system out of Select one: O a. using very large time slices converts it into a "first in first out" scheduling algorithm O b. using very small time slices converts it into the "shortest job first" algorithm O c. using extremely small time slices increases performance O d. using very small time slices converts it into a "first in first out" scheduling algorithm 14 (Choose only one answer Which system call can be used by a parent process to determine the termination of a child process? ed out of Select one: n O a. wait O b. exit O c. fork O d.get 15 (Choose only one answer) What will happen when a process closes a file? d out of Select one: O a. system wide entry's open count is decremented O b. none of the mentioned O c. per-process table entry is not removed O d. all of the mentioned en 16 (Choose only one answer) What is an operating system? ed Select one: O a interface between the hardware and application programs out of O b. collection of programs that manages hardware resources on O c. all of the mentioned O d. system service provider to the application programs 17 (Choose only one answer) Which one of the following can not be scheduled by the kemel but of Select one: a kernel level thread O b. none of the mentioned O C. process O d. user level thread 18 (Choose only one answer) The "swap space" exists in d Select one: out of O a. none of the mentioned O b. secondary memory O c. physical memory O d. CPU 19 (Choose only one answer) Concurrent access to shared data may result in out of Select one: O a. data insecurity O b. none of the mentioned O c. data inconsistency O d. data consistency