Measurement and Instrumentation
A 8085 microprocessor consist of

 Arithmetic and Logic Units (ALU), Control Unit (CU) and Registers.
 Arithmetic and Logic Units (ALU), Control Unit (CU), Registers and I/O devices.
 Arithmetic and Logic Units (ALU), Control Unit (CU) and I/O devices.
 Arithmetic and Logic Units (ALU), Control Unit (CU), Registers and Memory.

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Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

 It loads the circuit to maximum extent.
 It uses centre zero galvanometer instead of voltmeter.
  It does not load the circuit at all.
 It loads the circuit moderately.

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