The most active phagocytic white blood cells are:

The metal ion present in vitamin $B_{12}$ is

Which of the following statements is incorrect regarding physisorption?

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

$A$ particle of mass $m$ and charge $q$ moves with a constant velocity $v$ along the positive $x$ direction. It enters a region containing a uniform magnetic field $B$ directed along the negative $z$ direction,extending from $x = a$ to $x = b$. The minimum value of $v$ required so that the particle can just enter the region $x > b$ is

The set $\{x \in R: \cos 2x + 2 \cos^2 x = 2\}$ is equal to