Two charged spherical conductors of radius $R_1$ and $R_2$ are connected by a wire. Then the ratio of surface charge densities of the spheres $\left(\frac{\sigma_1}{\sigma_2}\right)$

Dihedral angle of least stable conformer of ethane is:

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

The major product of the following chemical reaction is:

A particular station of All India Radio, New Delhi, broadcasts on a frequency of $1368$ kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is:$\newline$

Which of the following plants is monoecious?

A typical angiosperm embryo sac at maturity is:

Gemmae are present in:

When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as:

Which of the following stages of meiosis involves division of centromere?