RAS RAS PCS Mains Exam Schedule

  Sound is measured in decibels (dB). An increase of about 10 dB is approximately double the increase in loudness. A person’s hearing can be damaged if exposed to noise levels over 75 dB over a prolonged period of time. The World Health Organization recommends that the sound level indoors should be less than 30 … Read more

Soil Pollution is the Contamination of the soil by human and natural activities which may cause harmful effects on living beings. This may be due to the following factors. (i) Industrial wastes: Industries are the major causes for soil pollution Textiles, steel, paper, Cement, oil, dyeing and other industries are responsible for soil pollution. Toxic … Read more

  Addition of certain substances to the water such as organic, inorganic, biological, radiological, heat, which degrades the quality of water so that it becomes unfit for use. Putrescibility is the process of decomposition of organic matter present in water by microorganisms using oxygen. Water having DO (dissolved oxygen)  content below 8.0 mg/L may be … Read more

  aggravated because of four developments: Increasing traffic, growing cities, rapid economic development, and industrialization contamination of air by the discharge of harmful substances   Major air pollutants and their sources Carbon monoxide (CO) It is a colourless, odourless gas that is produced by the incomplete burning of carbon – based fuels including petrol, diesel, … Read more

Environment Pollution is  defined as ‘an addition or excessive addition of certain materials to the physical environment (water, air and lands), making it less fit or unfit for life’. Pollutants are the materials or factors, which cause adverse effect on the natural quality of any component of the environment. Classifications According to the form in … Read more

    Coastal Ocean Monitoring and Prediction System (COMAPS) Being implemented from 1991. Assesses the health of coastal waters and facilitates management of pollution-related issues Programme was restructured and modified in 2000 2001 to include pollution monitoring; liaison, regulation and legislation; and consultancy services. 2.Land Ocean Interactions in the Coastal Zone (LOICZ)   Launched in … Read more

  Coral is actually a living animal. has a symbiotic relationship (each gives something to the other and gets something back in return) With ‘zooxanthellae’ microscopic algae which live on coral [i.e. instead of living on the sea  floor, the algae lives up on the coral which is closer to the ocean surface and so … Read more

  Mangroves are the characteristic littoral plant formation of tropical and subtropical sheltered coastlines. are trees and bushes growing below the high water level of spring tides which exhibits remarkable capacity for salt water tolerance. basically evergreen land plants growing on sheltered shores, typically on tidal flats, deltas, estuaries, bays, creeks and the barrier islands. … Read more

  located where river meets the sea. the most productive water bodies in the world The complete salinity range from 0-35 ppt is seen from the head (river end) to the mouth (sea end) of an estuary Coastal lakes which have their connection with the sea through small openings are better known as lagoons or … Read more

  Areas of marsh, fen, peatland/water, whether natural (or) artificial, permanent (or) temporary with water that is static (or) flowing, fresh, brackish (or) salt, including areas of marine water the depth of which at low tide does not exceed 6 mtrs. Wetlands Classification- Inland wetland- a)Natural- Lakes / Ponds, Ox-bow Lakes, Waterlogged, Swamp/marsh b) Manmade- … Read more