What is the female reproductive organ in mosses called?

The height of the cone of maximum volume inscribed in a sphere of radius $R$ is

Which of the following is a part of the pectoral girdle?

Two conducting circular loops of radii $R_1$ and $R_2$ are placed in the same plane with their centres coinciding. If $R_1$ > $R_2$, the mutual inductance $M$ between them will be directly proportional to

Which among the following is $NOT$ a feature of $S_N2$ mechanism?

$A$ fire hydrant delivers water of density $\rho$ at a volume rate $L$. The water travels vertically upward through the hydrant and then makes a $90^o$ turn to emerge horizontally at speed $V$. The pipe and nozzle have a uniform cross-section throughout. The force exerted by the water on the corner of the hydrant is