| List I | List II | ||
|---|---|---|---|
| A | Two or more alternative forms of a gene | I | Back cross |
| B | Cross of F1 progeny with homozygous recessive parent | II | Ploidy |
| C | Cross of F progeny with any of the parents | III | Allele |
| D | Number of chromosome sets in plant | IV | Test cross |
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is : 
AB is a part of an electrical circuit (see figure). The potential difference \(V_A - V_B\), at the instant when current \(i = 2\) A and is increasing at a rate of 1 amp/second is: