Questions

A magnetic disk is a storage device that uses a magnetization process to write, rewrite and access data. It is covered with a magnetic coating and stores data in the form of tracks, spots, and sectors. Hard disks, zip disks, and floppy disks are common examples of magnetic disks.

Hence, Magnetic disks are the most popular medium for both Direct access and Sequential access.

Optical fiber works on the principle of total internal reflection.

The Total Internal Reflection is the phenomenon in which the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.

After the Mumbai attacks in 2008, there has been a paradigm shift in the maritime security apparatus that increased emphasis on surveillance, intelligence gathering and information sharing amongst the various stakeholders to ensure an effective response to any emerging situation. In Feb 2009, the Indian Coast Guard (ICG) was additionally designated as the authority responsible for coastal security in territorial waters, including areas to be patrolled by the Coastal Police.

The Coast Guard is also responsible for overall coordination between Central and State agencies in matters relating to Coastal Security.In order to achieve near gap-free surveillance of the entire coastline, 38 additional Radar Stations and 08 Mobile Surveillance Systems are being installed.