Physics
Mercury is commonly used as a thermometric fluid rather than water because

mercury has greater visibility than water
specific heat of mercury is more than water
density of mercury is more than the water
specific heat of mercury is less than water

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Physics
A hydrogen balloon floats up because of

Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in weight
Air pressure decreases with decrease in height
The pressure inside the balloon is more than the pressure outside it

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