Operating Systems Quiz

In batch systems, turnaround time is:

• Higher than interactive systems

• Lower than real-time systems

• Similar to multiprogramming

• Not measurable

Which OS type offers immediate feedback to the user?

• Batch

• Time-sharing

• Real-time

• Interactive

A batch system executes 20 jobs in 100 minutes. What is the average turnaround time?

• 4 min

• 5 min

• 10 min

• 20 min

Spooling overlaps:

• I/O and computation

• CPU and memory

• Cache and RAM

• Processes and threads

What is the key benefit of multiprogramming?

• Maximizing I/O usage

• Reducing memory

• Increasing CPU utilization

• Avoiding deadlocks

In a batch system, if each job takes 2 minutes of CPU and 8 minutes of I/O, what is the CPU utilization for a single job?

• 0.2

• 0.25

• 0.8

• 0.4

A mainframe handles 1000 transactions/sec and supports 50 users. What is the average transactions per user per sec?

• 20

• 25

• 15

• 30

A system with 10 servers processes 1000 requests/sec total. If load is equally balanced, how many requests per server?

• 100

• 1000

• 10

• 50

A distributed system uses vector clocks with 8 processes. What is minimum size of vector clock?

• 8

• 1

• 4

• 16

If network bandwidth is 1 Gbps and file size to transfer is 100 MB, how long will transfer take ignoring overhead?

• 0.8 seconds

• 0.1 seconds

• 1.2 seconds

• 0.4 seconds