Gases may be distinguished from other forms of matter by their :
[amp_mcq option1=”lack of colour.” option2=”ability to flow.” option3=”inability to form free surfaces.” option4=”ability to exert a buoyant force.” correct=”option3″]
This question was previously asked in
UPSC CAPF – 2010
– Gases expand to fill whatever container they are in, meaning they do not form a distinct boundary or “free surface” in the way liquids do.
– Lack of colour (A) is not universal for gases (e.g., NO2 is brown).
– Ability to flow (B) is characteristic of both liquids and gases (they are both fluids).
– Ability to exert a buoyant force (D) is also characteristic of both liquids and gases (both are fluids).