General Knowledge Mixed Quiz

The kidneys are the body's primary filtration system, removing waste products and excess substances from blood through millions of tiny filtering units called nephrons. Each kidney processes about 200 quarts of blood daily, producing about 2 quarts of waste fluid (urine). The kidneys also regulate blood pressure, electrolyte balance, and red blood cell production.

One foot is equal to 12 inches in the imperial measurement system. This fundamental conversion is essential for length measurements in countries using imperial units. The imperial system originated in Britain and is still used in the United States and some other countries, though most of the world uses the metric system.

DVD stands for Digital Versatile Disc. Though originally called Digital Video Disc, it was renamed to reflect its broader use for storing various types of data beyond video. The distractors 'Volatile', 'Demand', and 'Viable' are invented terms that don't match the official expansion.

SMS stands for Short Message Service, the standard text communication service for mobile phones. 'Story', 'Sending', and 'Syndication' are incorrect expansions - the service was specifically designed for brief messages, not narratives or syndication.

Flight recorders (black boxes) are painted bright orange with reflective tape to make them easier to locate after crashes. The term 'black box' refers to their function, not appearance. White would blend with clouds/snow, while black would be hard to spot at night or in wreckage.