What is an interrupt vector?

• A. It is an address that is indexed to an interrupt handler
• B. It is a unique device number that is indexed by an address
• C. It is a unique identity given to an interrupt
• D. None of the mentioned

DMA is used for __________

• A. High speed devices(disks and communications network)
• B. Low speed devices
• C. Utilizing cpu cycles
• D. All of the mentioned

In a memory mapped input/output __________

• A. The cpu uses polling to watch the control bit constantly, looping to see if a device is ready
• B. The cpu writes one data byte to the data register and sets a bit in control register to show that a byte is available
• C. The cpu receives an interrupt when the device is ready for the next byte
• D. The cpu runs a user written code and does accordingly

In a programmed input/output(PIO) __________

• A. The cpu uses polling to watch the control bit constantly, looping to see if a device is ready
• B. The cpu writes one data byte to the data register and sets a bit in control register to show that a byte is available
• C. The cpu receives an interrupt when the device is ready for the next byte
• D. The cpu runs a user written code and does accordingly

In an interrupt driven input/output __________

• A. The cpu uses polling to watch the control bit constantly, looping to see if a device is ready
• B. The cpu writes one data byte to the data register and sets a bit in control register to show that a byte is available
• C. The cpu receives an interrupt when the device is ready for the next byte
• D. The cpu runs a user written code and does accordingly

In the layered approach of Operating Systems __________

• A. Bottom layer(0) is the user interface
• B. Highest layer(n) is the user interface
• C. Bottom layer(n) is the hardware
• D. Highest layer(n) is the hardware

How does the Hardware trigger an interrupt?

• A. Sending signals to cpu through a system bus
• B. Executing a special program called interrupt program
• C. Executing a special program called system program
• D. Executing a special operation called system call

Which operation is performed by an interrupt handler?

• A. Saving the current state of the system
• B. Loading the interrupt handling code and executing it
• C. Once done handling, bringing back the system to the original state it was before the interrupt occurred
• D. All of the mentioned

Round robin scheduling falls under the category of ____________

• A. Non-preemptive scheduling
• B. Preemptive scheduling
• C. All of the mentioned
• D. None of the mentioned

With round robin scheduling algorithm in a time shared system ____________

• A. Using very large time slices converts it into first come first served scheduling algorithm
• B. Using very small time slices converts it into first come first served scheduling algorithm
• C. Using extremely small time slices increases performance
• D. Using very small time slices converts it into shortest job first algorithm