/6 Science Quiz (for 12 to 16 years old): Quiz 8 1 / 6The filament of an electric bulb is made of graphite tungsten nichrome iron 2 / 6The two elements that are frequently used for making transistors are niobium and columbium silicon and germanium iridium and tungsten boron and aluminium 3 / 6Diamond is an allotropic form of silicon germanium sulphur carbon 4 / 6Permanent hardness of water can be removed by adding chlorine washing soda potassium permanganate bleaching powder 5 / 6Marsh gas is methane hydrogen ethane nitrogen 6 / 6In fireworks, the green flame is produced because of mercury potassium sodium barium Your score is 0% Restart quiz Next quiz Please rate the quiz Send feedback By WordPress Quiz plugin