Discussion

Match the properties in Column A with their respective unit in Column B

Column A	Column B
P. Surface resistivity	1. Ohm-cm
Q. Volume resistivity	2. S cm^-1
R. Coefficient of thermal expansion	3. Ohm
S. Electrical conductivity	4. K^-1

Answer: C

The match is P-3; Q-1; R-4; S-2.

Surface resistivity is the resistance across a square of surface, so its unit is the ohm (often written ohm per square).
Volume resistivity is resistance times area over thickness: ohm-cm.
The coefficient of thermal expansion is a fractional change per kelvin: K^-1.
Electrical conductivity is the reciprocal of resistivity: S cm^-1.

The options pairing surface resistivity with ohm-cm or S cm^-1, or the expansion coefficient with S cm^-1, confuse these.

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