OS Final Exam 2025

Given 3 page frames and the reference string: 7 0 1 2 0 3 0 4 2 3 0 3 2 1 2 0 1 7 0 1, how many page faults will occur using the LRU page replacement algorithm?

• 10

• 12

• 9

• 15

Using the same reference string and 3 page frames, how many page faults will the Optimal page replacement algorithm produce?

• 12

• 10

• 9

• 14

For the given reference string and 3 page frames, how many page faults occur with the FIFO page replacement algorithm?

• 15

• 12

• 9

• 10

Which of the following is not considered a main structural component of a computer system?

• Processor

• Main memory

• Operating system

• I/O modules

Which component of a computer system is responsible for storing data and programs?

• System bus

• Processor

• I/O modules

• Main memory

Which of the following provides for communication among elements of a computer system?

• Main memory

• Processor

• System bus

• Control unit

Which of the following element of a computer system moves data between the computer and its external environment?

• Processor

• I/O modules

• Main memory

• ALU

The processor contains a single data register, called

• IR

• MAR

• AC

• PC

This register specifies a particular input/output device

• I/OBR

• I/OAR

• PC

• IR

This register is used for the exchange of data between an I/O module and the processor

• MAR

• MBR

• I/OAR

• I/OBR