Very often people talk about the 'fairy rings' they most commonly seen in the forests. What are they? How do you account for their appearance ?

What do you mean by zero error of a screw gauge ? How is it accounted for ?

The following curve is obtained when molar conductivity (wedge_(m)) is plotted against the square root of concentration, c^(1//2) for two electrolytes A and B (a) How do you account for the increase in the molar conductivity of the electrolyte A on dilution. (b) As seen from the graph, the value of limiting molar conductivity (wedge_(m)^(0)) for electrolyte B cannot be obtained graphically. How can this value be obtained?1