Operating System (OS)
To save your computer from viruses you will do

Scan the removable disk before using it
Install antivirus software and run it
All of these
Make physical safe for the removal disk

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Operating System (OS)
The advantage(s) inherent to using high level languages is (are)

Improved debugging capability, and superior documentation
Fewer people, less management and shorter transition in learning time
None of these
A greater degree of machine independence
All of these

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

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