What is the effect of Abscisic Acid $(ABA)$?

Two steel wires of same length $L$ but radii $r$ and $2r$ are connected together end to end and tied to a wall as shown. $A$ force $F$ stretches the combination by $10 \ mm$. How far does the midpoint $A$ move in $mm$?

The random variable $X$ takes the values $1, 2, 3, \ldots, m$. If $P(X=n) = \frac{1}{m}$ for each $n$,then the variance of $X$ is

$A$ uniform rod of mass $M$ and length $L$ is placed on a smooth horizontal surface. $A$ horizontal force $F$ is applied at one end of the rod perpendicular to its length. The acceleration of the centre of mass of the rod is:

The oxidation potential of a hydrogen electrode at $pH = 10$ and $P_{H_2} = 1 \ atm$ will be ............ $V$.

The $pH$ of $0.05 \ M$ acetic acid is $(K_a = 2 \times 10^{-5})$