Science & Technology Current Affairs - 2020
Science & Technology Current Affairs 2019-2020 category comprises current affairs with all important national / international updates in science and tech and events for the year 2019-2020 for UPSC, States, Civil services, SSC and other competitive examinations of India and States.
Category Wise PDF Compilations available at This Link
Indian American Rangaswamy Srinivasan, has been nominated by President Barack Obama for the National Medal of Technology and Innovation.
Why this award? Why this laser is unique? About National Medal of Technology and Innovation
Tags: 2012 • Current Affairs 2012 • December 2012
Around 500 year old Gunpowder bags, dated back to around 1550, were found near the Jain temple in the Sonar fort of Jaisalmer, made famous by Satyajit Ray’s film ‘Sonar Kella’. These explosives were used in cannons.
What is Gunpowder?
- Gunpowder which is also called black powder was the first chemical explosive and the only one known until the mid-1800s.
- Mixture of sulfur, charcoal, and potassium nitrate (saltpeter)
- Sulfur and Charcoal act as fuels, while the saltpeter works as an oxidizer.
- Propellant in firearms and as a pyrotechnic composition in fireworks.
- Earlier, used as explosives in cannons