Which of the following guards the opening of the hepatopancreatic duct into the duodenum?

$A$ and $B$ are two concentric circular loops carrying currents $i_1$ and $i_2$ as shown in the figure. If the ratio of their radii is $1:2$ and the ratio of the magnetic flux densities at the centre $O$ due to $A$ and $B$ is $1:3$,then the value of $\frac{i_1}{i_2}$ will be:

$A$ closed hollow insulated cylinder is filled with gas at $0^{\circ} C$ and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas in one side of the piston is heated to $100^{\circ} C$. If the piston moves $5 ~cm$, the total length of the hollow cylinder is: (in $~cm$)

The accessory glands of the human male reproductive system are:

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

The area (in square units) of the triangle formed by the lines $x=0$,$y=0$ and $3x+4y=12$ is: