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