Feeling the tremors of an earthquake,a scared resident of the seventh floor of a multistoreyed building starts climbing down the stairs rapidly. Which hormone initiates this action?

Which of the following is the strongest acid?

Which of the following aqueous solutions has the highest boiling point?

The metal ion present in vitamin $B_{12}$ is

If the temperature increases,then what happens to the frequency of the sound produced by the organ pipe?

$A$ tangent is drawn to the ellipse $\frac{x^2}{27} + y^2 = 1$ at the point $(3\sqrt{3} \cos \theta, \sin \theta)$,where $\theta \in (0, \pi/2)$. The value of $\theta$ for which the sum of the intercepts on the axes made by this tangent is minimum,is: