Yes.
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The answer depends on .005 WHAT! There will be a different number on 0.005 inches in an inch compared to the number of 0.005 miles! And since the units have not bothered to say what the units are, it is impossible to give a sensible answer.
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.
Yes.
Yes, but only if the rational number is 0.
Only if the rational number is 0.