Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 More than one device can transmit information over the data bus by enabling only one device at a time
 The data line can be multiplexed for both input and output
 More than one device can transmit over the data bus at the same time
 It increases the speed of data transfer over the data bus

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Microprocessor
Assertion(A): Monostablemultivibrators (IC74121) are used in a microprocessor based system for frequency measurement. Reason(R): Microprocessor counts the number of interrupt signals/second or within a specified interval through ISR.

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

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Microprocessor
ALU (Arithmetic and Logic Unit ) of 8085 microprocessor consists of

 Accumulator, arithmetic, logic circuits and five flags
 Accumulator, temporary register, arithmetic and logic circuits
 Accumulator, temporary register, arithmetic, logic circuits and five flags
 Accumulator, arithmetic and logic circuits

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