Which of the following is not an antibiotic?

What is the stored food (nutrient) in algae?

$A$ lorry and a car moving with the same $K.E.$ are brought to rest by applying the same retarding force,then

The molecular formula of diphenylmethane is $C_{13}H_{12}$. How many structural isomers are possible when one of the hydrogen atoms is replaced by a chlorine atom?

If $A = \begin{bmatrix} 1 \\ 2 \\ 3 \end{bmatrix}$,then $AA' = $

Two springs have spring constants $K_A$ and $K_B$ such that $K_A > K_B$. If both springs are stretched by the same extension $x$,the work required will be: