Microprocessor
In 8085 name/names of the 16 bit registers is/are

 stack pointer.
 none of these.
 both A and B.
 program counter.

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

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

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