The acrosome of a sperm contains:

The electronic configuration of the phosphide ion $(P^{3-})$ is similar to that of:

If $b$ and $c$ are the lengths of the segments of any focal chord of a parabola $y^2 = 4ax$,then the length of the semi-latus rectum is:

The square root of $134 + \sqrt{6292}$ is:

$A$ metallic square loop $ABCD$ is moving in its own plane with velocity $v$ in a uniform magnetic field perpendicular to its plane as shown in the figure. Electric field is induced:

The condition that the roots of $x^3-b x^2+c x-d=0$ are in geometric progression is