Questions

Indian Grandmaster Viswananthan Anand (48 year) has won the World Rapid Chess Championship 2017 in Riyadh, Saudi Arabia. He remained unbeaten throughout the tournament and bags the top position on a tie-break after three-way tie with Vladimir Fedoseev.Note: World Rapid Chess Championship is a tournament to determine the World Champion in Chess played under rapid time controls.

In urban areas, rain water available from roof tops of buildings, paved and unpaved areas goes waste. This water can be recharged to aquifer and can be utilized gainfully at the time of need. In areas where the surface soil is impervious and large quantities of roof water or surface runoff is available within a very short period of heavy rainfall, the use of trench/ pits is made to store the water in a filter media and subsequently recharge to ground water through specially constructed recharge wells.

Gully plugs are built using local stones, clay and bushes across small gullies and streams running down the hill slopes carrying drainage to tiny catchments during rainy season.It is applicable only in rural areas.

An acid can be defined as a molecule or other species which can donate a proton or accept an electron pair in reactions.

(OR)

A substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind.