Correct Answer The first laser was a solid state laser. Solid state refers to any solid material like a glass rod. Diode lasers are very common because they are used to read compact disks and digital video disks in computers, CD players, and DVD players. Before diode lasers, the most common type of laser may have been the helium-neon laser, in which the active medium is a combination of the two gasses helium and neon.
Question: Breaking of a larger hydrocarbon molecule into a smaller one by heating in the presence of a catalyst is called ___.
Correct Answer Cracking is done so as to meet the increasing demand of petrol. For example Dodecane(C12H26) is cracked into Heptane(C7H16) and Pentene(C5H10) by heating intensely with the presence of a catalyst. The new hydrocarbons are similar to the hydrocarbons of gasoline. Nowadays however, synthetic petrol is also used widely. This is produced by mixing powdered coal with heavy oil and passing hot hydrogen gas over it.
Question: Where was the first oil well struck in the world?
Correct Answer You might have thought that oil was first struck somewhere in the Middle East. Nope!. In 1859, the first oil well was struck in Pennsylvania in the USA! The second oil well was struck in 1867 in Makum, India.