Is this betting?

We all know that betting is illegal in our country.

Now consider a scenario:
Just before elections I organise a quiz like "Test your political knowledge". There is entry fees of Rs 100 and all persons who answer with error of +/-10 (or whatever scale you want to keep like satta) will be joint winners.

Now it is very much similar to betting but will it be called as such?
And is betting allowed with no money involved? Is such a thing even called as betting. Would sure like to know laws in this regard.