Question 1

The process which terminates before the parent process exits becomes
A)zombie
B)orphan
C)child
D)none of the above

Accepted Answer

A zombie process is a process that has terminated but still has an entry in the process table. This can happen if the parent process exits before the child process. The child process will then become a zombie process and will remain in the process table until the system administrator manually removes it.

Question 2

Return value of fork() system call can be:
A)-1,<0,0
B)-1,>0,0

Accepted Answer

The return value of the fork() system call can be -1 (indicating an error in process creation), 0 (to the newly created child process), and a positive value greater than 0 (to the parent process, indicating the process ID of the newly created child process).

Question 3

If the fork() system call returns -1, then it means?
A)no new child process is created
B)the child process is an orphan
C)the child process is in zombie

Accepted Answer

When the fork() system call returns -1, it indicates that no new child process has been created, usually due to an error such as a lack of system resources.

Question 4

Fork returns _____ to parent process on success
A)0
B)child process id
C)parent process id
D)none

Accepted Answer

Fork returns the child process ID to the parent process upon successful creation of a child process. This allows the parent process to track and manage the child process.

Question 5

Which niceness value among the following indicate most favorable scheduling?
A)0
B)19
C)5
D)-20

Accepted Answer

A lower niceness value (negative values) indicates higher priority, making -20 the most favorable for scheduling.

Question 6

The maximum time slice that can be given to a process in Linux (where tick is 10ms) is
A)150ms
B)10ms
C)300 ms
D)600ms

Accepted Answer

In Linux, the maximum time slice that can be given to a process is 600ms, which is 60 ticks when each tick is 10ms.

Question 7

Nice can be used by an ordinary process to
A)increase the priority of a process
B)decrease the priority of a process
C)increase or decrease the priority of a process

Accepted Answer

The 'nice' command in Unix-like operating systems is used to decrease the priority of a process, making it "nicer" to other processes by allowing them more CPU time.

Question 8

Which one can be a real time schedule policy?
A)sched_fifo
B)sched_spf
C)sched_other
D)sched_filo

Accepted Answer

sched_fifo, which stands for First In, First Out, is a real-time scheduling policy in Linux that allows a process to run until it either voluntarily yields the CPU, is preempted by a higher priority process, or is blocked by an I/O operation.

Question 9

Solaris real time class priority is
A)0-59
B)60-99
C)100-159
D)160-169

Accepted Answer

Real-time class priority in Solaris ranges from 100 to 159.

Question 10

On x86-32 Linux, at which address the code segment of the program starts?
A)0x00000000
B)0x08048000
C)0x80000000
D)0xbfff0000

Accepted Answer

On x86-32 Linux, the code segment of a program typically starts at address 0x08048000. This is a convention used to provide a consistent starting point for the executable code in a process's memory space.

Question 11

On x86-32 Linux, at which address the user stack resides normally?
A)0x00000000
B)0x3fff0000
C)0x7fff0000
D)0xbfff0000

Accepted Answer

On x86-32 Linux systems, the user stack typically starts just below the kernel space, around the address 0xbfff0000, and grows downwards towards lower addresses.

Question 12

A system has 512MB of physical memory. Which among the following is not a suitable virtual memory size for this system architecture?
A)512mb
B)256m
C)4gb
D)none of the above

Accepted Answer

Virtual memory size is not strictly limited by the size of physical memory. It can be equal to, less than, or significantly larger than the physical memory size. Therefore, all the given options are suitable virtual memory sizes.

Question 13

LRU stands for
A)last received unit
B)least recently used
C)least recently usable
D)lost recoverd unit

Accepted Answer

LRU stands for "least recently used," which is a common caching algorithm that discards the least recently used items first.

Question 14

Mm_struct maintains?
A)memory files
B)open files
C)pipe
D)active memory regions

Accepted Answer

mm_struct in the Linux kernel is responsible for maintaining a process's memory management information, including its active memory regions. This structure does not directly manage memory files, open files, or pipes, but rather the virtual memory areas and the paging structures for a process.

Question 15

Is page table per process entity?

Accepted Answer

Each process has its own page table, which maps the virtual addresses used by the process to physical addresses in memory, allowing for process isolation and efficient memory management.

Question 16

Among these files which has an ELF format
A)shared objects
B)core
C)executables
D)all of the above

Accepted Answer

ELF (Executable and Linkable Format) is used for shared objects, core dumps, and executables in Unix-like systems.

Question 17

If one of the thread in multithreaded process is blocked on an I/O, which of the following is true?
A)the entire process with block if their is no kernel supported threads
B)other threads of the process will continue to execute even if there is no kernel supported threads
C)it depends on specific implementatation
D)all of the above

Accepted Answer

In a user-level threading model without kernel support, if one thread is blocked, the entire process is blocked because the kernel is unaware of the individual threads.

Question 18

UNIX/Linux kernel is?
A)monolithic
B)micro
C)exo
D)nano

Accepted Answer

The UNIX/Linux kernel is monolithic, meaning it operates in a single address space and contains all the core services.

Question 19

Monolithic kernel
A)is highly extensiblity
B)has less run time overhead
C)smaller than micro level
D)suitable for real time system

Accepted Answer

Monolithic kernels have less runtime overhead because they run all the basic system services in the kernel space, which allows for faster execution compared to microkernels that require inter-process communication.

Question 20

Runlevel system command is used for?
A)getting the present and previous runlevel of the system
B)setting the runlevel attribute of the system in the inittab file
C)can be used to restart or reboot the system
D)all of the above

Accepted Answer

The runlevel command is versatile, allowing users to get the current and previous runlevels, set the system's runlevel in the inittab file, and even restart or reboot the system, making all the provided options correct.

Quiz 4: Operating System and Process Management

The process which terminates before the parent process exits becomes

Return value of fork() system call can be:

If the fork() system call returns -1, then it means?

Fork returns _____ to parent process on success

Which niceness value among the following indicate most favorable scheduling?

The maximum time slice that can be given to a process in Linux (where tick is 10ms) is

Nice can be used by an ordinary process to

Which one can be a real time schedule policy?

Solaris real time class priority is

On x86-32 Linux, at which address the code segment of the program starts?

On x86-32 Linux, at which address the user stack resides normally?

A system has 512MB of physical memory. Which among the following is not a suitable virtual memory size for this system architecture?

LRU stands for

Mm_struct maintains?

Is page table per process entity?

Among these files which has an ELF format

If one of the thread in multithreaded process is blocked on an I/O, which of the following is true?

UNIX/Linux kernel is?

Monolithic kernel

Runlevel system command is used for?