Match List I with List II :
| List-I Polymer | List-II used for items | ||
|---|---|---|---|
| A | Nylon 6,6 | I | Buckets |
| B | Low density polythene | II | Non-stick utensils |
| C | High density polythene | III | Bristles of brushes |
| D | Teflon | IV | Toys |

A bob of mass \(m\) is suspended at a point \(O\) by a light string of length \(l\) and left to perform vertical motion (circular) as shown in the figure. Initially, by applying horizontal velocity \(v_0\) at the point ‘A’, the string becomes slack when the bob reaches at the point ‘D’. The ratio of the kinetic energy of the bob at the points B and C is: 
Neoprene is formed from chloroprene. It is prepared by free radical polymerisation. The monomer of neoprene is chloroprene. It is used for preparing gaskets, conveyor belts etc.