Question

Handle of utensil are made of hard plastic ,wood and bakelite

Answer 1

because they are bad conductor of heat......

Answer 2

The primary reasons are to provide a comfortable grip which also balances the weight of the utensil, and to act as a thermal barrier to help prevent the handle from becoming too hot. There are many more compounds than just wood and bakelite used to achieve these purposes, but it's hard to find any that truly work better!