Which of the following will not show geometrical isomerism?

The centre of mass of a body

$A$ metal crystallises in a face-centred cubic $(FCC)$ structure. If the edge length of its unit cell is '$a$',the closest approach between two atoms in the metallic crystal will be:

Which part of the ovary in mammals acts as an endocrine gland after ovulation?

If the system of equations $ax + y + z = 0$,$x + by + z = 0$,and $x + y + cz = 0$ $(a, b, c \neq 1)$ has a non-trivial solution,then the value of $\frac{1}{1 - a} + \frac{1}{1 - b} + \frac{1}{1 - c}$ is:

When a proton is accelerated through $1\,V,$ then its kinetic energy will be........$eV$.