1.

    Sound travels faster in humid air than in dry air. This is primarily because:

    A

    Humid air is less dense than dry air.

    B

    Water vapor molecules have higher kinetic energy than nitrogen or oxygen molecules.

    C

    Humid air has more pressure than dry air.

    D

    Collisions between water vapor molecules and other air molecules enhance the propagation of sound.

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    3.

    Velocity of sound in air is

    A

    Faster in dry air than in moist air

    B

    Directly proportional to pressure

    C

    Directly proportional to temperature

    D

    Independent of pressure of air

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