[4. In order for a system to be considered as multiprogramming, which of the following features should it have ? a) Accounts belonging to more than one user in the system to be b) More than one device connected to the system c) The system has more than one processor d) None 15. Following Which of the statements given for the wait () system call are correct? a) Child Transaction by when called The retum value of the wait () syscall is . b) walt () system call child process ( child process) suspended causes removal . c) wait ( ) system call always non-blocking in the structure it works. d) None 16. o operating mode has lower privilege ( less-priviledged) than operating mode. a) program / protected b) protected / system c) user/program d) user / kernel 17. Which of the instructions ( instructions ) that will perform the following operations cannot be run by applications ? a) Changing the base register value b) Relocation Changing the register value c) Loading a value into the timer d) Disable interrupts Relocation of a 10,000-byte transaction If the register value is 5,000 , which of the following memory addresses does a trap occur? a) 10,350 physical addiress logical address 10,350 c) to 4,500 physical addresses d) None 20. Using a large page in a system ensures efficient disk access. b) intemal It ensures less fragmentation - c) page table -related overhead (over head) causes it to increase - d) None. 21. When using the paging method reentrant For what reasons is a piece of code in the structure easier to share between the process and the process? a) Study No changes can be made to the piece of code during it. b) Each operation can change the code fragment in its own way. c) Changes made on the code are identical for each operation i identical ). d) None