Perguntas de entrevista da empresa Mayank's IT

Though interview, many steps, sometimes confusing to the candidate because the questions asked in the process were not very clear of how to answer than correctly to the person who was doing the interview at the moment

Puzzle Suppose there are N balls. out of which only 1 ball is lighter in weight. You are given a simple balance. Then How many minimum no. of attempts do one take to find out that