Microprocessor
Assertion(A): Address bus is unidirectional. Reason(R): Data bus is bidirectional

 A is true but R is false
 A is false but R is true
 Both A & R are true but R is not the correct explanation of A
 Both A & R are true and R is the correct explanation of A

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Microprocessor
When referring to instruction words, a mnemonic is

 a short abbreviation for the data word stored at the operand address.
 a short abbreviation for the operand address.
 shorthand for machine language.
 a short abbreviation for the operation to be performed.

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