/6 Science Quiz (for 12 to 16 years old): Quiz 4 1 / 6The average salinity of sea water is 3% 2% 3.5% 2.5% 2 / 6When an iron nail gets rusted, iron oxide is formed without any change in colour or weight of the nail without any change in the weight of the nail with increase in the weight of the nail with decrease in the weight of the nail 3 / 6The group of metals Fe, Co, Ni may best called as alkali metals main group metals transition metals rare metals 4 / 6Galvanised iron sheets have a coating of tin chromium lead zinc 5 / 6Among the various allotropes of carbon, coke is the hardest, graphite is the softest diamond is the hardest, coke is the softest diamond is the hardest, graphite is the softest diamond is the hardest, lamp black is the softest 6 / 6In which of the following activities silicon carbide is used? cutting very hard substances Making casts for statues Making cement and glass Disinfecting water of ponds Your score is 0% Restart quiz Next quiz Please rate the quiz Send feedback By WordPress Quiz plugin
