Physics
A Fuse wire is characterised by

Low resistance and high melting point
High resistance and low melting point
Low resistance and low melting point
High resistance and high melting point

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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.
The pressure inside the balloon is more than the pressure outside it
Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight

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