A ________ is a full duplex connection between a device driver and a user level process.

• A. Bus
• B. I/o operation
• C. Stream
• D. Flow

I/O is a _________ in system performance.

• A. Major factor
• B. Minor factor
• C. Does not matter
• D. None of the mentioned

If the number of cycles spent busy – waiting is not excessive, then ____________

• A. Interrupt driven i/o is more efficient than programmed i/o
• B. Programmed i/o is more efficient than interrupt driven i/o
• C. Both programmed and interrupt driven i/o are equally efficient
• D. None of the mentioned

What is the disadvantage of real addressing mode?

• A. There is a lot of cost involved
• B. Time consumption overhead
• C. Absence of memory protection between processes
• D. Restricted access to memory locations by processes

Preemptive, priority based scheduling guarantees ____________

• A. Hard real time functionality
• B. Soft real time functionality
• C. Protection of memory
• D. None of the mentioned

Real time systems must have ____________

• A. Preemptive kernels
• B. Non preemptive kernels
• C. Preemptive kernels or non preemptive kernels
• D. Neither preemptive nor non preemptive kernels

What is Event latency?

• A. The amount of time an event takes to occur from when the system started
• B. The amount of time from the event occurrence till the system stops
• C. The amount of time from event occurrence till the event crashes
• D. The amount of time that elapses from when an event occurs to when it is serviced.

Interrupt latency refers to the period of time ____________

• A. From the occurrence of an event to the arrival of an interrupt
• B. From the occurrence of an event to the servicing of an interrupt
• C. From arrival of an interrupt to the start of the interrupt service routine
• D. None of the mentioned

Real time systems need to __________ the interrupt latency.

• A. Minimize
• B. Maximize
• C. Not bother about
• D. None of the mentioned

The amount of time required for the scheduling dispatcher to stop one process and start another is known as ______________

• A. Event latency
• B. Interrupt latency
• C. Dispatch latency
• D. Context switch