Questions

The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. The stronger pull exerted by the uncontaminated portion of water brings about a movement of the surface and the camphor particles are carried along with it. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.

The   Second   Five-year   plan   was drafted  under  the  leadership  of  P. C.   Mahalanobis. It   focused   on heavy    industries    and    followed socialist  pattern  of  society  as  its goal.Since savings and investment were growing in this period, a bulk of  these  industries  like  electricity railways,   steel, machineries   and communication could be developed in the public sector. However it had its   problems   as   well,because industry attracted more investment than  agriculture,  the  possibility  of food shortage became adverse.So, the    planners    found    balancing industry    and    agriculture    really difficult;  while  K.  N.  Raj  drafted sections  of  India’s  first  Five-Year Plan

A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.

Light from a distant object strikes the top mirror and is then reflected at an angle of 90 degrees down the periscope tube. At the bottom of the periscope, the light strikes another mirror and is then reflected into the viewer’s eye.

Hence, A periscope works by the principle of Total internal reflection.

It is a scheme across the river Rihand near Pipri in Mirzapur district of Uttar Pradesh