Answer to your question depends on the value of share, i.e. what is the minimum trade value your broker allows, so for instance if your broker only accepts orders above Rs 500/- , then you can buy a single stock of only companies like ONGC,INfosys,Reliance etc. (as their price is > 500)
But please be aware that there is also a minimum brokerage per order and if suppose you buy a share for Rs 600 where the minimum brokerage is Rs50, you have to pray for atleast 18% appreciation (i.e. rs 108/- ) just to break even.:thumb:
all the Best,
BJ