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