Current Affairs Question - 18 December 2019

Explanation :

• A fuel cell is a device that generates electricity by converting chemical energy into electrical energy. Every fuel cell has two electrodes called, respectively, the anode and cathode. The reactions that produce electricity take place at the electrodes.
• Hydrogen is the basic fuel, but fuel cells also require oxygen. One great appeal of fuel cells is that they generate electricity with very little pollution–much of the hydrogen and oxygen used in generating electricity ultimately combines to form harmless by product- water.
• The most common type of fuel cell for vehicle applications is the polymer electrolyte membrane (PEM) fuel cell. In a PEM fuel cell, an electrolyte membrane is sandwiched between a positive electrode (cathode) and a negative electrode (anode).

Examples

• Polymer electrolyte membrane fuel cells
• Direct methanol fuel cells
• Alkaline fuel cells
• Molten carbonate fuel cells
• Solid oxide fuel cells

Advantages

• Low-to-Zero Emissions
• High Efficiency
• Reliability
• Fuel Flexibility
• Energy Security
• Durability
• Scalability
• Quiet Operation

Explanation :

• The Sattriya dance form was introduced in the 15th century A.D by the great Vaishnava saint and reformer of Assam, Mahapurusha Sankaradeva as a powerful medium for propagation of the Vaishnava faith.
• Sattriya dance tradition is governed by strictly laid down principles in respect of hasta mudras, footworks, aharyas, music etc.
• This tradition, has two distinctly separate streams - the Bhaona-related repertoire starting from the Gayan-Bhayanar Nach to the Kharmanar Nach, secondly the dance numbers which are independent, such as Chali, Rajagharia Chali, Jhumura, Nadu Bhangi etc.
• One-act plays of Sattriya are called Ankiya Nat, which combine the aesthetic and the religious through a ballad, dance and drama. The plays are usually performed in the dance community halls (namghar) of monastery temples (sattras). The themes played relate to Krishna and Radha, sometimes other Vishnu avatars such as Rama and Sita.
• The dance is accompanied by musical compositions called borgeets, which are based on classical ragas.
• The instruments that accompany a traditional performance are khols (drums), taals (cymbals) and the flute.
• On 15 November 2000, the Sangeet Natak Akademi finally gave Sattriya Nritya its due recognition as one of the classical dance forms of India.