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