Lactose is composed of ......... .

The inverse point of $(1,2)$ with respect to the circle $x^2+y^2-4x-6y+9=0$ is

Convergent evolution is illustrated by

$A$ small square loop of wire of side $l$ is placed inside a large square loop of side $L$ $(L \gg l)$. If the loops are coplanar and their centres coincide,the mutual inductance of the system is directly proportional to :

Which of the following are not electromagnetic waves?

If $x_n = \cos \left(\frac{\pi}{4^n}\right) + i \sin \left(\frac{\pi}{4^n}\right)$,then the product $x_1 x_2 x_3 \ldots \infty$ is equal to