Name a single letter that can be suffixed to the following words to form new words?

$\mathrm{HAT} \mathrm{BAR} \mathrm{BAT} \mathrm{PIN} \mathrm{BATH}$

If $+$ stands for division, $\times$ stands for addition, $-$ stands for multiplication, $÷$stands for subtraction , which of the following is correct?

Which option replaces the question mark $\left(?\right)$ in the figure given below?

Which option replaces the question mark $\left(?\right)$ in the figure given below?

Which option replaces the question mark $\left(?\right)$ in the figure given below?

Which option replaces the question mark $\left(?\right)$ in the figure given below?

Group the given nine figure into $3$ classes using each figure only once.

In the given question , one or more dots are placed in the figure marked  as $\left(A\right)$. The  figure is followed by four alternatives marked as $\left(a\right), \left(b\right), \left(c\right)$ and $\left(d\right)$. One out of these four options contains regions common to the circle, square, triangle, similar to that marked by dot in figure $\left(A\right)$. Choose that figure.

Group the given $9$ figures into $3$ classes using each figure only once.