Operating System (OS)
Semaphores

are used to do I/O
None of these
synchronize critical resources to prevent deadlock
are used for memory management
synchronize critical resources to prevent contention

ANSWER DOWNLOAD EXAMIANS APP

Operating System (OS)
System maintenance:

always requires several programs
is usually not necessary
None of these
is necessary on all systems, regardless of how good
is not required if the system is well written

ANSWER DOWNLOAD EXAMIANS APP

Operating System (OS)
The function(s) of the Syntax phase is(are)

to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.
to build a uniform symbol table
to parse the source program into the basic elements or tokens of the language.
to build a literal table and an identifier table
None of these

ANSWER DOWNLOAD EXAMIANS APP

Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

halts for a predetermined time
branches off to the interrupt service routine after completion of the current instruction
branches off to the interrupt service routine immediately
None of these
hands over control of address bus and data bus to the interrupting device

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Operating System (OS)