In $Bryophytes$,sexual reproduction occurs through which organs?

$A$ charge $Q$ is divided into two charges $q$ and $Q-q$. The value of $q$ such that the force between them is maximum,is

Which one of the following is not correct?

The current through an ideal $PN-$ junction diode shown in the following circuit diagram will be.....$mA$.

The second maturation division of the mammalian ovum occurs:

$A$ body of mass $M \ kg$ is at the top point of a smooth hemisphere of radius $5 \ m$. It is released to slide down the surface of the hemisphere. It leaves the surface when its velocity is $5 \ m/s$. At this instant,the angle made by the radius vector of the body with the vertical is: (Acceleration due to gravity $g = 10 \ m/s^2$) (in $^{\circ}$)