Operating System (OS)
A relationship between processes such that each has some part (critical section) which must not be executed while the critical section of another is being executed, is known as

mutual exclusion
multiprogramming
None of these
semaphore
multitasking

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Operating System (OS)
The term "operating system" means

the way a floppy disk drive operates
the way a computer operator works
conversion of high level language into machine code
None of these
a set of programs which controls computer working

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Operating System (OS)
The function(s) of file system is (are):

to provide security against loss of information due to system failure
to provide for long and short term storage of files with appropriate economic tradeoffs.
to provide complete file naming freedom to the users and to permit controlled sharing of files
None of these
All of these

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Operating System (OS)
All of the following are task performed by the operating system except

Controlling the access that application program has to the CPU
Managing hardware on the computer
Performing housekeeping task like file compression and disk defragmentation
Provides an interface for user to interact with computer

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