:)What is the best time frame to use for day trading? Plz suggest . 
Depends on what you mean by time frame ! Is it the time frame of candle sticks or time frame of the day ? If it's time frame of the candle stick a suggest you rely on 1h sticks If you are trading with small amounts , 30-5 min if you are trading with big amounts.
If it's time frame of the day then it would be the whole day if you got that kind of free time .