S.I. unit of conductance is-

• A. Ohm
• B. Siemen
• C. Ohm metre
• D. Ohm/metre

The S.I. unit of conductance is the Siemens, often represented by the symbol "S." Conductance measures how easily electricity can flow through a material.

Understanding Conductance

Conductance is the reciprocal of resistance, which means that a higher conductance indicates a lower resistance to electrical flow.

Options Explained

• Ohm: This is the unit of resistance, not conductance.
• Siemens: Correct answer; it measures conductance.
• Ohm metre: This unit relates to resistivity, not conductance.
• Ohm/metre: This is a measure of resistivity as well.

In summary, the correct answer is Siemens.