i want the answers for all the questions

Part 1 - choose the correct/best answer (only one answer for each question) 1. The followings are Operating system goals exeept A. Use the computer hardware in an efficient manner C. Execule user programs and make solving user problems easier 2. A(n) A 2.A(n) is a software-generated inter A. API C system call E. Oher, B. Input request 3. When a user-level process wishes to eall a funetlon E. Oool A. it directly executes the desired function 4. is a niethoum is subdivided into multiple programs C. allows multiple programs to D. the OS clanges it frono kernet mode those programs that may be generated by a B. processor during the execution of a process D. is a method for allocating VO resources to multiple 5. In Unix, which system call creates a new process? A clone() C create) B. newo D. inito E. Othen 6. Test and Set solution is a .......solution to the critical section problem. It assumes ... processes. A.Software,manyC.Hardware,manyB.Hardware,twoD.Soltware,two 7. Which of the following about parent-child proces Other: C.ChildrencannotcontainthreadsifparentsdontcontainthreadsB.ChildrenmaysharesubsetofparmisresourcesD.Parentandchildrenmayexecuteconcurrently 8.WhichofthefollowingisNOTcorrect:E.Other: A. Critical section C. Bounded waiting B. Context switch D. Mutex E. Other: 10. Assume five processes arriving with negligible inter-arrival times and with CPU burst lengths 14 , 25, 17, 7, and 10 time units, respectively. What is the average waiting time using RR seheduling with a quantum time 10 units? A 22 B. 14.6 C. 48 D. 18 E. Oher: Consider the following scenario: State I: Process PI acquires semaphore S by peforming an wair() operation State 2. Process P2 then arrives and attempts to acquire S State 3: Process P3 then arrives and attempts to acquire S. State 4: Process P/ releases S by performing a signal() eperation. 11. Which of the following could be true right after State 3 and righr before State 4 ? A. P2 is running its critical section B. P3 is running its critical section C. P3 is blocked on semaphore S D. PI is blocked on semaphore S E. Oher