Measurement and Instrumentation
In DC potentiometer measurments, a second reading is often taken after reversing the polarities of the DC supply and the unknown voltage and the average of the two reading is taken. This is with a view of eliminate the effects of

 Errorneous standardisation.
 Stray magnetic fields.
 Ripples of the DC supply.
  Stray thermal emfs.

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Measurement and Instrumentation
A 8085 microprocessor consist of

 Arithmetic and Logic Units (ALU), Control Unit (CU), Registers and Memory.
 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) and Registers.

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