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

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

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Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

they are memory resident
they are initially stored on disk
None of these
they are partly in primary memory and partly on disk
they are available on magnetic tapes

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Operating System (OS)
The Register - to - Register (RR) instructions

None of these
which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also
All of these
have both their operands in the main store.

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