$101.$ Application call the operating system by using:

A$.$ System call

B$.$ Thread

C$.$ program

D$.$ Job

$102.$ The steps of invocation of application by OS don't contain:

A$.$ OS requests user input to identify application "file"

B$.$ OS loads application file $($executable$)$ into memory

C$.$ OS loads the memory address of the application's starting instruction into the PC

D$.$ OS fetches instructions of application

$103.$ To execute program, operating system uses :

A$.$ consumer mode and kernel mode

B$.$ user mode and kernel mode

C$.$ client mode and kernel mode

D$.$ user mode and core mode

$104.$ This method is used by system call to pass parameters to the OS :

A$.$ record

B$.$ frame

C$.$ Stack

D$.$ folder

$105.$ Program invoke system calls through:

A$.$ records

B$.$ links

C$.$ API

D$.$ variables

$106.$ A programmer thinks that OS is:

A$.$ A set of facilities

B$.$ A set of services

C$.$ A set of forms

D$.$ A set of system calls

$107.$ The following OS service was designed as a special service:

A$.$ Error detection

B$.$ I$/$O operations

C$.$ Resource allocation

D$.$ File$-$system manipulation

$108.$ The Linux command line "cat" is used to call a $........$ services

A$.$ I$/$O operations

B$.$ User interface

C$.$ File$-$system manipulation

D$.$ Program execution

$109.$ Unix operating system is considered as:

A$.$ Shell kernel system

B$.$ Microkernel system

C$.$ No kernel system

D$.$ Monolothic kernel system