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APPLY LATEST GOVT JOBS

hi
1 Shell is the exclusive feature of
(A)UNIX
(B)DOS
(C)System software
(D)Application software


2 Operating system is
(A)Hardware
(B)Software which manage resources of the system
(C)Software which performs computation
(D)None


3 A system call is a method by which a program makes a request to the
(A)Input Management
(B)Output Management
(C)Interrupt processing
(D)Operating system