The square root of 2 is real number but it is not rational number because it can't be expressed as a fraction.
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Sometimes. The number '4' is real and rational. The number 'pi' is real but not rational.
Decimals are real. They can be rational or irrational.
1/2, 5, pi, respectively
No. For example, pi is a real number, but it is irrational (it cannot be converted into an exact fraction).The reverse is true, however: all rational numbers are also real numbers.
No. Every real number is not a natural number. Real numbers are a collection of rational and irrational numbers.