Operating System (OS)
The higher versions of the operating systems are so written that programs designed for earlier versions can still be run. What is it called?

None of these
Upward compatibility
Upgradability
Universality
Upward mobility

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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
Controlling the access that application program has to the CPU
Provides an interface for user to interact with computer

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Operating System (OS)
Assembler language

is quite different from the SCL interpreter
is a mnemonic form of machine language
None of these
requires fixed-format commands
is usually the primary user interface

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Operating System (OS)
File record length

should be chosen to match the data characteristics
Should always be variable
None of these
depends upon the size of the file
should always be fixed

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