A frictionless circular wire of unit radius is fixed on the horizontal plane. Two-point particles of unit mass start moving simultaneously from point $A(\theta=\frac{\pi}{2})$ with identical uniform angular speeds in opposite directions, and meet again at point $B(\theta=-\frac{\pi}{2})$. During this time, which of the following figures schematically represent the magnitude of the total linear momentum P of the system, as a function of $\theta$? [Image Placeholder]

Sponges exchange $O_{2}$ with $CO_{2}$ by

The following table presents the part of the electromagnetic spectrum and their corresponding major applications. P. Microwave - I. For purifying the water Q. UV rays - II. For warming the food R. Gamma rays - III. For AM and FM communication systems S. Radio wave - IV. For treating the Cancer cells The correct option is:

Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure. $W_{1}$, $W_{2}$, $W_{3}$ and $W_{4}$ represent work done (in calories) in the processes 1, 2, 3 and 4, respectively; $\Delta U_{2}$ and $\Delta U_{4}$ are changes in the internal energy for the processes 2 and 4, respectively. [use $R=2~cal~K^{-1}~mol^{-1}$] The correct option is

According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is