Which part of the body secretes the hormone secretin?

$A$ spherical rubber balloon carries a charge,uniformly distributed over the surface. As the balloon is blown up and increases in size,the total electric flux coming out of the surface

When a certain circuit consisting of a constant $e.m.f.$ $E$, an inductance $L$, and a resistance $R$ is closed, the current in it increases with time according to curve $1$. After one parameter $(E, L, \text{or } R)$ is changed, the increase in current follows curve $2$ when the circuit is closed a second time. Which parameter was changed and in what direction?

In a $P-N$ junction diode,if the $P$ region is more heavily doped than the $N$ region,then the depletion layer is:

Chlorination of toluene in the presence of light and heat followed by treatment with aqueous $NaOH$ yields:

If $(1, a)$ and $(b, 2)$ are conjugate points with respect to the circle $x^2+y^2=25$,then $4a+2b$ is equal to