When two liquids are poured into a graduated cylinder, two layers form. Liquid A has a volume of 16 ml and a mass of 87 g. Liquid B has a volume of 234 ml and a mass of
100 g. Based on this information which liquid will form the top layer?

i'm assuming that the correct answer is indeed the first one/ "a"..

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.