the sensex deal with 30 numbers of industries but nifty deal
only 15 numbers of industries,

sensex is the index name of BSE and nifty is the index name 
of the NSE. Where sensex deal with 30 nomber of shares and 
nifty deal with 50 number of industries.

Sensex consists of 30 shares and it is baeed on floating mkt
capitalisation whereas nifty has 50 shares based on full mkt
capitalisation

According to indian capital market sensex means sensitive 
index it is the index name for BSE where as nifty is the 
index name for NSE .BSE consists of 30 companies scripts 
and nifty consists of 50 companies scripts