991A common household smoke detector is generally designed to sense the presence of what in the air to trigger an alarm?
992Bulletproof glass generally achieves its strength mainly by combining multiple layers of glass with what other material?
993A common household mixer or blender is generally powered by which type of everyday household energy source?
994Streetlights that automatically turn on at dusk commonly rely on which type of sensor to detect changing light levels?
995An electric kettle heats water quickly mainly by passing electric current through what component?
996Modern credit and debit cards commonly use an embedded microchip mainly to improve what aspect of transactions?
997A common electric iron used for pressing clothes generates heat mainly using which basic electrical principle?
998Traffic signal lights commonly use red, yellow, and green colors, with red universally understood to mean what instruction?
999A simple mechanical wristwatch generally keeps time using the regular, repeating motion of what internal component?
1000A common home Wi-Fi router primarily functions to do what for multiple connected devices?
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