Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

swapping a process to the disk
suspending some of the processes when the CPU load is high
bring processes from the disk to the main memory
None of these
assigning ready process to the CPU

ANSWER DOWNLOAD EXAMIANS APP

Operating System (OS)
A critical region is

a program segment that often causes unexpected system crashes
a program segment where shared resources are accessed
none is the above
one which is enclosed by a pair of P and V operations on semaphores
a program segment that has not been proved bug-free

ANSWER DOWNLOAD EXAMIANS APP

Operating System (OS)
Semaphores

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

ANSWER DOWNLOAD EXAMIANS APP