Q1: Which is valid declaration of a float?

ANS:A - float f = 1F;

Option A is valid declaration of float. Option B is incorrect because any literal number with a decimal point u declare the computer will implicitly cast to double unless you include "F or f" Option C is incorrect because it is a String. Option D is incorrect because "d" tells the computer it is a double so therefore you are trying to put a double value into a float variable i.e there might be a loss of precision.