What is polarisation index?

What is polarisation index?
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Answer :

a) It is defined as a ratio of 10 minutes resistance value to 1-minute resistance value.

b) It gives a quantitative information about the insulation with respect to moisture, dirt and other contamination.

c) A PI value of less than 1.0 indicates a need for immediate reconditioning. 
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Stoner and others have shown how groups can make decisions that are much less, or much more, cautious that any member would take alone. What are these changes called? (a) Diffusion of responsibility ; (b) Risky and cautious shift ; (c) Polarisation (d) Decision arrangement

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The phenomenon which causes mirage is (1) Interference (2) Diffraction (3) Polarisation (4) Total internal reflection

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