Particulates (< 1 ?m size) remaining suspended in air indefinitely and transported by wind currents are called
1). Mists
2). Fumes
3). Aerosols
4). Smoke
2. ?SI unit of luninious intensity is:?
5. When a light wave is reflected from a mirror, there is a change in its
6. In the formula average velocity = $\frac{(u + v)}{2}$ , u is the ___________.
7. In a optical fibre cable, the signal is propagated along the
8. If the diameter of a capillary is doubled then the rise of water in it will be