Which of the following is related to genetic engineering?

$\lim _{x \rightarrow 0} \frac{\tan ^3 x-\sin ^3 x}{x^5}$ is equal to

To convert a galvanometer into a voltmeter,one should connect a

Which of the following reacts with benzene in the presence of anhydrous aluminum chloride to form acetophenone?

$A$ particle is dropped from a height $H$. Find the time taken by the particle to reach the ground.

The equations of the perpendicular bisectors of sides $AB$ and $AC$ of a $\triangle ABC$ are $x-y+5=0$ and $x+2y=0$ respectively. If the coordinates of vertex $A$ are $(1, -2)$,then the equation of $BC$ is