Question 1

Each physical device in UNIX is identified by a minor device number,a major device number,and a contact address.

Accepted Answer

In UNIX, each physical device is identified by a major device number and a minor device number. The major number identifies the driver associated with the device, and the minor number identifies the specific instance of the device the driver controls. There is no concept of a "contact address" for identifying devices in UNIX.

Question 2

In UNIX,the process table is set up when the process is created and is deleted when the process terminates.

Accepted Answer

The process table contains information about all the processes currently running on the system and is set up when a process is created. It is deleted when the process terminates.

Question 3

The exec family of commands-execl,execv,execle,execlp and execvp-is used to start execution of a new program from another program.

Accepted Answer

The exec family of commands is indeed used to start execution of a new program from another program.

Question 4

In UNIX,swapping uses a round robin memory-management policy.

Accepted Answer

The answer of In UNIX,swapping uses a round robin memory-management...

Question 5

The system command,split,splits a program into two copies,which are both running from the statement after the command.

Accepted Answer

The `split` command in Unix-like systems is used to split a file into pieces, not to duplicate running programs. It does not relate to the execution flow of programs.

Question 6

A strength of UNIX is its true multitasking capabilities.

Accepted Answer

UNIX is known for its ability to perform true multitasking, which means it can run multiple processes or tasks simultaneously, without compromising performance or stability. This is achieved through the use of a powerful kernel, which manages system resources and scheduling of processes.

Question 7

The UNIX process scheduling algorithm picks the process that will run in the shortest amount of time to be run first.

Accepted Answer

The UNIX process scheduling algorithm uses a variety of factors (such as process priority, process state, and CPU usage) to determine which process should be run next. The algorithm does not simply pick the process with the shortest amount of time to run.

Question 8

The UNIX I/O system is divided into the block I/O system and the interactive I/O system.

Accepted Answer

The UNIX I/O system is not divided into the block I/O system and the interactive I/O system. This statement is false. Instead, it is divided into the file system and the terminal I/O system.

Question 9

The UNIX kernel does not reside in memory permanently;that is,it can be swapped out when needed to provide more space for applications.

Accepted Answer

The UNIX kernel is designed to remain in memory at all times to manage system operations and cannot be swapped out like application processes.

Question 10

The original development goals for UNIX were twofold: to develop an operating system that would support software development,and to keep its algorithms as simple as possible.

Accepted Answer

This statement is true. The original development goals for UNIX were to support software development and keep the algorithms simple.

Question 11

UNIX can be mastered by novice programmers in a matter of weeks.

Accepted Answer

UNIX is a complex operating system with a steep learning curve, and mastering it typically requires months or even years of study and practice, especially for novice programmers.

Question 12

The Processor Manager of a UNIX system kernel handles the allocation of the CPU,process scheduling,and the satisfaction of process requests.

Accepted Answer

The Processor Manager is responsible for CPU allocation, process scheduling, and servicing process requests within a Unix system kernel.

Question 13

UNIX is designed to provide device dependence to the applications running under it.

Accepted Answer

UNIX is designed to provide device independence to the applications running under it.

Question 14

Demand paging requires more complicated hardware configurations than swapping in that it increases the system overhead and under heavy loads,might lead to thrashing.

Accepted Answer

Demand paging involves more complex hardware mechanisms like page fault handling, page replacement algorithms, and mapping logical to physical addresses, which increase system overhead. It also has the potential to cause thrashing when the system is heavily loaded, leading to performance degradation. In contrast, swapping involves simpler hardware mechanisms but may also cause performance issues due to disk I/O operations.

Question 15

UNIX and Linux strongly resemble each other in many ways but are different operating systems.

Accepted Answer

UNIX and Linux share many similarities as they both were developed from the same philosophy and have many common underlying features. However, they are different operating systems with different kernel architectures and some variations in command syntax and tools.

Question 16

IBM and Hewlett-Packard were among the companies that established The Open Group,which still owns the trademark to the name UNIX.

Accepted Answer

IBM and Hewlett-Packard were indeed among the companies that established The Open Group, and The Open Group still owns the trademark to the name UNIX.

Question 17

The second column in a UNIX directory listing indicates the number of links,also known as the number of aliases,that refer to the same physical file.

Accepted Answer

The second column in a UNIX directory listing indicates the number of links that refer to the same physical file. This is also known as the file's link count.

Question 18

The portability of UNIX is attributed to the fact that most of it is written in the high-level language Java.

Accepted Answer

The statement is false. UNIX is not written in Java, but in C programming language which is itself a portable language. The portability of UNIX is due to its design and implementation choices, such as the use of standardized interfaces and system calls.

Question 19

UNIX has grown to become one of the most widely used operating systems in history.

Accepted Answer

UNIX has been widely adopted as an operating system by businesses, government agencies, and educational institutions. It has been in use for over 50 years and its influence can be seen in many modern operating systems such as Linux and macOS.

Question 20

UNIX stores files as sequences of bytes and does not impose any structure on them.

Accepted Answer

UNIX does not impose any structure on files and stores them as sequences of bytes. It is up to the applications reading the files to interpret the bytes and impose structure if necessary.

Quiz 13: Unix Operating Systems