OSG202 Final Exam Practice Questions and Answers

OSG202 Final Exam Practice Questions and Answers 127/ A CPU may have separate fetch, decode and execute units, so that can carry out three steps of the three instructions in the same time is called: [A] Multicore [B] Pipeline [C] None of the other choices [D] Superscalar - ANSWER-B 197/ A CPU may have multiple execution units, so that can carry out multiple instructions in the same time is called: ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/35 a. Pipeline b. Superscalar c. Multicore d. None of the other choices - ANSWER-B Examples of general purpose stored program computers - ANSWER-MP3 player 10/ The two basic types of processor registers are: a. General and special registers b. Control and Status registers c. User-visible and user-invisible registers d. None of the above - ANSWER-A 192/ Which of special register contains the condition code bits, the CPU priority, the mode bit and other control bits? [A] Program Status Word (PSW) [B] ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/35 None of the other choices [C] Instruction Register (IR) [D] Program Counter (PC) - ANSWER-A 3/ The four main structural elements of a computer system are: a. Processor, Registers, I/O Modules, Main Memory b. Processor, Registers, Main Memory, System Bus c. Processor, Main Memory, I/O Modules, System Bus d. None of the above . main structural elements of a computer system - ANSWER-C 89/ The language of the CPU is known as its [A] ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 4/35 Register set [B] Control unit set [C] Instruction set [D] None of the other choices - ANSWER-C 200/ Which of main bus in the IBM PC computer, that can run at 66 MHz and transfer 8 bytes at a time? a. ISA (Industry Standard Architecture) b. PCI (Peripheral Component Interconnect) c. ISA and PCI d. None of the other choices - ANSWER-B 178/ Which is the fastest bus in the IBM PC computer? [A] ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 5/35 ISA (Industry Standard Architecture) [B] USB (Universal Serial BUS) [C] IDE (Integrated Drive Electronic) [D] PCI (Peripheral Component Interconnect) - ANSWER-A Operating mode - ANSWER-Operating mode 1/ Which of the following statements is incorrect about user mode and kernel mode? a. In kernel mode, the OS can execute every instruction in the instruction set b. In user mode, user program can execute only a subset of instructions c. Having two modes of operation helps prevent user programs from accessing critical instructions d. None of the above - ANSWER-D 7/ What is correct about trap instructions and interrupts? ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 6/35 a. A trap instruction switch the execution mode of a CPU from the user mode to the kernel mode. b. A trap instruction is caused by a user program to invoke functions in the OS kernel c. An interrupt is caused by an external event d. All of the above - ANSWER-D 13/ Which of the following instructions should be allowed in user mode? a. Disable all interrupts b. Read the time-of-day clock c. Set the time-of-day clock d. Change the memory map - ANSWER-B 87/ Which of the following instructions should be allowed