""Open inputs can "float" to undefined values so you may need a pull-up or pull-down resistor...""
What would happens If I connect the 3.3 volts to all analog pins to make sure they dont float and then sending a 5 volt signal above the 3.3volts. will it read 5 (higher voltage) or would I damage my arduino??? Well maybe using a resistor to lower the 3.3 to 0.5 volts would be safer????