/7 Science Quiz (for 12 to 16 years old): Quiz 2 1 / 7The hardest substance available on earth is Diamond Platinum Iron Gold 2 / 7The gas usually filled in the electric bulb is Nitrogen hydrogen carbon dioxide oxygen 3 / 7Which of the gas is not known as green house gas? Methane Nitrous oxide Hydrogen Carbon dioxide 4 / 7What is the primary cause of climate change? Natural factors Animal activity Human activity Climate change is primarily caused by human activity, particularly the burning of fossil fuels and deforestation.5 / 7Washing soda is the common name for Calcium bicarbonate Sodium carbonate Calcium carbonate Sodium bicarbonate 6 / 7Bromine is a red liquid highly inflammable gas colourless gas black solid 7 / 7Quartz crystals normally used in quartz clocks etc. is chemically silicon dioxide sodium silicate a mixture of germanium oxide and silicon dioxide germanium oxide Your score is 0% Restart quiz Next quiz Please rate the quiz Send feedback By WordPress Quiz plugin
