Which of the following is an irrational number?

A rational number equivalent to $\frac{7}{19}$ is

Choose the rational number which does not lie between $-\frac{2}{3}$ and $-\frac{1}{5}$ 

$\pi$ is

The decimal expansion of $\sqrt{2}$ is

Which of the following is an irrational number?

How many digits are there in the repeating block of digits in the decimal expansion of $\frac{17}{7}?$

Which of the following numbers is irrational?

The product of two irrational numbers is