Hi teacher, can u help me answer all the question? If your answer is true I will upvote you Q1 A counting semaphore S is initialized to 7. Then, 20 Poperations and 15 V operations are performed on S. What is the final value of S? Select one: OA 28 OB. 12 OC 18 OD 2 Q2 A counting semaphore S is initialized to 7. Then, 20 Poperations and 15 V operations are performed on S. What is the final value of S? Select one: O A 28 OB. 12 OC 18 OD. 2 Q3 For a magnetic disk, the following specification are given: Average seek time (AST) = 5 msec Disk rotation = 6000 RPM Data rate = 40 KB/sec Controller overhead = 0.1 msec Given that average access time = AST + Average rotational delay + Transfer time + Controller overhead + Queuing delay The correct average access time is Select one: O A 5/3 msec + 5 msec +40 KB/Sec +0.1 msec +0 OB. Smsec + 6000/60 RPS + 40 msec + 0.1 msec +0 OC 5 msec +60/(6000) msec + 12.5 msec +0.1 +0 OD. 5 msec +(0.5 x 60/6000) x 1000 msec + 12.5 msec +0.1 msec + 0 Q4 Using a larger block size in a fixed block size file system leads to : Select one: O A poorer disk throughput and poorer disk space utilization O B. better disk throughput but poorer disk space utilization OC. poorer disk throughput but better disk space utilization OD. better disk throughput and better disk space utilization