$CaCl_2$ and $Ca(OCl)_2$ are components of:

An animal phylum having radially symmetrical adults but bilateral symmetrical larvae is

Vitamin $K$ is required for:

Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.

The radii of curvature of the faces of a double convex lens are $10\, cm$ and $15\, cm$. Its focal length is $12\, cm$. What is the refractive index of the glass?

$A$ block of mass $8\, kg$ is at rest on a rough inclined plane as shown in the figure. The magnitude of the net force exerted by the surface on the block will be ......... $N$.