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