When a market settles, a contract will pay out ₹100/share if you are holding the correct response and ₹0/share if you are holding the incorrect response. If you took the incorrect position, on settlement, your total loss is the cost of the contracts you initially purchased. If you bought 10 contracts at a price of ₹20 each, then you would lose ₹200.
You will never lose any money other than that which you originally invested. Tradex does not allow trading on margin or leverage.