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Aluminium oxide: Quiz


Question 1: Aluminium oxide is responsible for resistance of metallic aluminium to ________.
MineralCalcium carbonateWeatheringOxygen

Question 2: Annual world production of alumina is approximately 45 million ________, over 90% of which is used in the manufacture of aluminium metal.
United States customary unitsTonneKilogramMetric system

Question 3: Health and medical applications include it as a material in ________.
Knee replacementDistraction osteogenesisHip replacementJoint replacement

Question 4: In its most commonly occurring crystalline form, called corundum or α-aluminium oxide, its hardness makes it suitable for use as an ________ and as a component in cutting tools.
CarbonSharpening stoneAbrasiveAbrasive machining

Question 5: The thickness and properties of this oxide layer can be enhanced using a process called ________.

Question 6: [4] It is used in water filters (derived water treatment chemicals such as aluminium sulfate, aluminium chlorohydrate and sodium aluminate, are one of the few methods available to filter water-soluble ________ out of water).
Sodium fluorideFluorideFluorineFluoride poisoning

Question 7: When trace elements make it appear red it is known as ________, but all other colorations fall under the designation sapphire.

Question 8: Aluminium oxide is widely used in the fabrication of superconducting devices, particularly single electron transistors and superconducting quantum interference devices (________), where it is used to form highly resistive quantum tunneling barriers.

Question 9: Large tonnages are also used in the manufacture of ________, coating titania pigments, and as a fire retardant/smoke suppressant.

Question 10: Both its strength and abrasive characteristics are due to aluminium oxide's great hardness (position 9 on the ________).
Mohs scale of mineral hardnessGoldCopperBoron


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