If two $+ 5 D$ lenses are mounted at some distance apart,the equivalent power will always be negative if the distance is

Which of the following is included in plant breeding?

An electron initially present in an excited state of $H$ atom is further excited to another energy level by an incident photon. It releases $10$ photons while coming back to the ground state,out of which $7$ have higher energy than the incident photon. The electron was initially present in

Which of the following oxides is the most basic oxide?

Which among the following is $NOT$ a dicarboxylic acid?

The radius of a circular plate is increasing at the rate of $0.01 \text{ cm/s}$ when the radius is $12 \text{ cm}$. Then, the rate at which the area increases, is