The second maturation division of the mammalian ovum occurs:

The objective and eyepiece of an astronomical telescope are double convex lenses with refractive index $1.5$. When the telescope is adjusted to infinity,the separation between the two lenses is $16 ~cm$. If the space between the lenses is now filled with water (refractive index $4/3$) and the telescope is again adjusted for infinity,then the present separation between the lenses is: (in $~cm$)

The major product of the reaction is:

Two large holes are cut in a metal sheet. If this sheet is heated,what will happen to the distances $AB$ and $BC$ as shown in the figure?

What is the approximate weight of the flower of $Rafflesia$ $arnoldii$ (in $kg$)?

If $m \begin{bmatrix} -3 & 4 \end{bmatrix} + n \begin{bmatrix} 4 & -3 \end{bmatrix} = \begin{bmatrix} 10 & -11 \end{bmatrix}$,then $3m + 7n$ is equal to