The coefficient of $x^5$ in the expansion of $(1+x^2)^5(1+x)^4$ is:

Let $A = \{x \in R, x \neq 0, -4 \leq x \leq 4\}$ and $f: A \rightarrow R$ be defined by $f(x) = \frac{|x|}{x}$ for $x \in A$. Then,the range of $f$ is

Kangaroo rat is found in .........

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

The angle between the pair of straight lines formed by joining the points of intersection of $x^2+y^2=4$ and $y=3x+c$ to the origin is a right angle. Then $c^2$ is equal to

Parts $A, B, C$ and $D$ of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions / characteristics: