Operating System (OS)
What is the name of the operating system which was originally designed by scientists and engineers for use by scientists and engineers?

MS DOS
XENIX
UNIX
None of these
OS/2

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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.
have both their operands in the main store.
All of these
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

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