Questions

We know that, Elements in the same group of the periodic table have similar characteristics.

Here Magnesium and Strontium shared some similar properties because they both belong to the same group. Sr is the chemical symbol for strontium which is a group two element; it has atomic number of 38. 

Dr. Gullapalli N. Rao, the founder and chair of the LV Prasad Eye Institute (Hyderabad), has been selected to the 2017 Ophthalmology Hall of Fame instituted by the American Society of Cataract and Refractive Surgery (ASCRS). He will be honoured at the induction ceremony in Los Angeles on May 6, 2017 at the annual meeting of the ASCRS.

Currently, Rao is the President of the prestigious Academia Ophthalmologica International (AOI), a group of 80 eminent academicians in ophthalmology in the world and is a past Chair of the International Agency for the Prevention of Blindness (IAPB).

Kachchh district is the largest in India in terms of territorial extent, located in the state of Gujarat.
The second largest district is Leh in Jammu & Kashmir.

There are different colors that are used for different signs on the maps. The typical color standard for topographic maps depicts contours in brown, bodies of water in blue, boundaries in black, and grids and roads in red. Topographic maps may use different colors to represent area features.

Black represents man-made objects or cultural features like roads, bridges, borders, etc...