Microprocessor
Consider the following statements: Arithmetic Logic Unit (ALU) 1.Performs arithmetic operations 2.Performs comparisons. 3.Communicates with I/O devices 4.Keeps watch on the system Which of these statements are correct?

 1, 2 and 3
 1, 2, 3 and 4
 3 and 4 only
 1 and 2 only

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Microprocessor
The correct sequence of steps in the instruction cycle of a basic computer is

 Read effective address, Decode, Fetch and Execute.
 Fetch, Decode, Read effective address and, Execute.
 Fetch, Read effective address, Decode and Execute.
 Fetch, Execute, Decode and Read effective address.

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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
 It increases the speed of data transfer over the data bus
 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

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