$110.$ What is the right definition of an operating system :

A$.$ It is the one program running some times on the computer usually called the kernel

B$.$ It is a software that manages the computer hardware and provides an environment for application$$programs to run

C$.$ It is a program that acts as an intermediary between data and the computer hardware

D$.$ It is some information processed at all times on the computer usually called the kernel

$111.$ For an OS a Batch file is considered as one component of:

A$.$ the security layer

B$.$ the file management layer

C$.$ Kernel $($process manager$)$

D$.$ User interface layer

$112................$ is one of the operating system functions :

A$.$ user border

B$.$ memory management

C$.$ information management

D$.$ Terminal management

$113.$ The steps of invocation of application by OS include:

A$.$ OS does not requests user input to identify application "file"

B$.$ OS fetches instructions of application

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

D$.$ OS analyses instructions of application

$114.$ An Application designer considers OS as:

A$.$ A set of models

B$.$ A set of services

C$.$ A set of system calls

D$.$ A set of code lines

$115.$ The mode bit is a bit not used :

A$.$ to specify user mode and kernel mode

B$.$ to differentiate when system is running user code or kernel code

C$.$ to specify user mode and privileged mode

D$.$ to specify only the user mode

$116.$ An application developer 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

$117.$ A c$++$ language programmer identifies system call by using:

A$.$ A number

B$.$ the name of the wrapper of the system call$($c$++$ statement$)$

C$.$ The general name of API

D$.$ The specific name of an API library

$118.$ OS can't be invoked through:

A$.$ signal interrupt

B$.$ link

C$.$ system call

D$.$ Error

$119................$ is not one of the operating system functions :

A$.$ Process management

B$.$ Device management

C$.$ Memory management

D$.$ data management