OSG202 Verified Questions And Answers With 100% Passed Quizzes
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OSG202
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OSG202
OSG202 Verified Questions And Answers With 100% Passed Quizzes
1 (2299) 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 instru...
OSG202 Verified Questions And Answers With 100%
Passed Quizzes
1 (2299) 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 ANS D
2 (2302) Random Access memory:
a. Is typically faster than cache memory
b. Is volatile
c. Can only be read sequentially
d. Stores all the files on the computer ANS B
3 (2294) 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 ANS C
4 (2292) What is the main characteristic of embedded operating system?
a. Multiple CPU
b. Time-sharing
c. Many I/O devices
d. Restriction of memory size, speed of CPU, screen size, powers ANS D
5 (2300) Which is the difference between personal computers and mainframe computers?
a. Personal computers are always interactive
,b. Mainframe computers are mostly batch systems with many users
c. Protection is much more important on mainframe computers
d. All of the above ANS D
6 (2303) What is not correct about system calls?
a. A system call allows a user process to assess and execute operating system functions inside the
kernel.
b. User programs use system calls to invoke operating system services
c. In terms of performance, using system calls is better than using procedure calls
d. Every system call involves overhead due to context switch ANS C
7 What is correct about trap instructions and interrupts?
(2301)
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 ANS D
8 (2293) A Control/Status register that contains the address of the next instruction to be fetched is
called the:
a. Instruction Register (IR)
b. Program Counter (PC)
c. Program Status Word (PSW)
d. All of the above ANS B
9 (2291) The general role of an operating system is to:
a. Act as an interface between various computers
b. Provide a set of services to system users
,c. Manage files for application programs
d. None of the above ANS B
10 (2290) 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 ANS A
11 (2304) What is interrupt vector?
a. A signal an I/O device sends to CPU
b. A signal an I/O device sends to CPU
c. Part of memory which contains the addresses of interrupt handlers
d. None of the above ANS C
12 (2297) What is not a main function of an operating system?
a. Provide the users with an extended (virtual) machine
b. Manage the I/O devices
c. Provide user interfaces
d. Support virtual memory ANS C
13 (2296) 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 ANS B
, 14 (2298) Which of the following statements is incorrect about timesharing and multiprogramming
systems?
a. In a timesharing system, multiple users can access the system simultaneously
b. In a multiprogramming system, one user can run several processes simultaneously
c. All timesharing systems are multiprogramming systems
d. All multiprogramming systems are timesharing systems ANS D
15 (2295) MS-DOS is a example of ....
a. Monolithic system
b. Layered System
c. Virtual Machine
d. Client-server model
********************************************* ANS A
1 (2309) Which of the following statements is correct about Shortest Job First
a. Avoid Starvation
b. Minimize average waiting time
c. Both a and b
d. None of the above ANS B
2 (2310) In order to implement mutual exclusion on a critical resource for competing processes, only
one program at a time should be allowed:
a. In the critical region of the program
b. To perform message passing
c. To exhibit cooperation
d. None of the above ANS A
3 (2305) Which of the following process state transitions are legal?
a. waiting -> running
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