Operating System (OS)
To delete a file without allowing it to store in recycle bin

Press Alt + Delete key
Press Shift + Delete key
Press Delete key
Press Ctrl + Delete key

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

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Operating System (OS)
Virtual Memory

allows multiple programs to reside in separate areas of core at the time.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
None of these
is a method of allocating processor time.
consists of those addresses that may be generated by a processor during execution of a computation.

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