Balloon Flight | MCQs

    Q1: The lightest gas that provides a larger elevation for balloons and is the lightest of all gases is _____?

    تمام گیسوں میں کون سی گیس سب سے ہلکی ہے؟
    • A. Nitrogen
    • B. Hydrogen
    • C. Oxygen
    • D. None of these
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