Whenever I take up a survey it is showing that I am not Qualified to take the survey . Even I am not able to complete a single survey . Why ?

Because they are targeted to some gender, age, job, family, income, hobbies, animals owned, ect...

because they need only your private information for sale it to a third party, but not paying you. I give up on any surveys, I spend a ton time to give them my information about myself and read the same comment.