A multilevel page table is preferred in comparison to a single level page table for translating virtual address to physical address because ____________

• A. It reduces the memory access time to read or write a memory location
• B. It helps to reduce the size of page table needed to implement the virtual address space of a process
• C. It is required by the translation lookaside buffer
• D. It helps to reduce the number of page faults in page replacement algorithms

The ________ can be turned off by the CPU before the execution of critical instruction sequences that must not be interrupted.

• A. Nonmaskable interrupt
• B. Blocked interrupt
• C. Maskable interrupt
• D. None of the mentioned

The __________ is used by device controllers to request service.

• A. Nonmaskable interrupt
• B. Blocked interrupt
• C. Maskable interrupt
• D. None of the mentioned

The interrupt vector contains ____________

• A. The interrupts
• B. The memory addresses of specialized interrupt handlers
• C. The identifiers of interrupts
• D. The device addresses

Division by zero, accessing a protected or non existent memory address, or attempting to execute a privileged instruction from user mode are all categorized as ________

• A. Errors
• B. Exceptions
• C. Interrupt handlers
• D. All of the mentioned

For large data transfers, _________ is used.

• A. Dma
• B. Programmed i/o
• C. Controller register
• D. None of the mentioned

A character stream device transfers ____________

• A. Bytes one by one
• B. Block of bytes as a unit
• C. With unpredictable response times
• D. None of the mentioned

A block device transfers ____________

• A. Bytes one by one
• B. Block of bytes as a unit
• C. With unpredictable response times
• D. None of the mentioned

What is a dedicated device?

• A. Opposite to a sharable device
• B. Same as a sharable device
• C. Can be used concurrently by several processes
• D. None of the mentioned

A keyboard is an example of a device that is accessed through a __________ interface.

• A. Block stream
• B. Set of blocks
• C. Character stream
• D. None of the mentioned