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    Question

    Smog is a combination of

    –
    A Smog Correct Answer Incorrect Answer
    B Water and smoke Correct Answer Incorrect Answer
    C Fire and water Correct Answer Incorrect Answer
    D Smoke and fog Correct Answer Incorrect Answer

    Solution

    Smog is a type of air pollution; the word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky fog. The word was then intended to refer to what was sometimes known as pea soup fog, a familiar and serious problem in London from the 19th century to the mid 20th century. This kind of smog is caused by the burning of large amounts of coal within a city; this smog contains soot particulates from smoke, sulfur dioxide and other components.

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