Which classification system was proposed by $Woese$?

Which one of the following population interactions is widely used in medical science for the production of antibiotics?

The total charge induced in a conducting loop when it is moved in a magnetic field depends on

The maximum value of $xy$ subject to $x+y=7$ is

Express $9072$ as a product of primes.

Two insulated metallic spheres of $3\,\mu F$ and $5\,\mu F$ capacitances are charged to $300\,V$ and $500\,V$ respectively. The energy loss,when they are connected by a wire is (in $,J$)