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Standard VII
Physics
Sources of Heat Energy
Which among t...
Question
Which among the following are in biogas?
A
Neither air nor water
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B
Air but not water
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C
Water but no air
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D
Air and Water
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The speeds of red light and yellow light are exactly same
(a) in vacuum but not in air
(b) in air but not in vacuum
(c) in vacuum as well as in air
(d) neither in vacuum nor in air
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