OS QUIZ 1

Calculate average waiting time using FCFS for P1(0,6), P2(2,8), P3(4,7), P4(5,3).

• 5.75 ms
• 8.5 ms
• 6.75 ms
• 7.25 ms

In RR (quantum=4ms), P1(10ms), P2(5ms), P3(8ms). What is turnaround time for P3?

• 19 ms
• 21 ms
• 22 ms
• 20 ms

SRTF Scheduling: Processes P1(0,7), P2(2,4), P3(4,1). Compute number of context switches.

• 2
• 3
• 4
• 5

Which type of OS ensures critical tasks meet deadlines?

• Time-sharing OS
• Distributed OS
• Real-time OS
• Multi-user OS

Which is TRUE about Microkernel architecture?

• Device drivers run in kernel space
• Kernel is small and modular
• Kernel handles all services
• Process management is in user space

Which scheduling algorithm ensures minimum average waiting time if all processes arrive at time zero?

• FCFS
• SJF (Non-preemptive)
• Round Robin
• Priority Scheduling

Which scheduling algorithm may cause starvation?

• FCFS
• SJF (Preemptive)
• Round Robin
• None of the above

Context switch involves saving and loading of:

• Only CPU registers
• CPU registers and PCB
• Only Memory contents
• File descriptors only

RR Scheduling: Time quantum=3ms, P1(6ms), P2(4ms), P3(9ms). What is total turnaround time for P2?

• 9 ms
• 10 ms
• 8 ms
• 11 ms

In Priority Scheduling (Preemptive): P1(0,9,3), P2(1,4,1), P3(2,2,2). Compute average turnaround time.

• 11 ms
• 10 ms
• 12 ms
• 9.5 ms