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The outer surface of a beaker containing ice cubes becomes wet in short while - Give scientific reason.

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Question  The outer surface of a beaker containing ice cubes becomes wet in short while. Answer  When ice cubes are placed in a beaker, ice starts melting.  The heat required for melting is absorbed from the surrounding air and also from the beaker to some extent.  Hence, the temperature of the air and beaker falls.  The capacity of air to hold water vapour depends upon the temperature of the air, and this capacity decreases as the temperature decreases.  At a certain low temperature, the surrounding air becomes saturated with water vapour present in it.  As the temperature falls further, the air is unable to hold all the water vapour.  Hence, the extra water vapour starts condensing on the cold outer surface of the beaker in the form of minute drops.  Therefore, The outer surface of the beaker containing ice cubes becomes wet in a short while.
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The material used for fuse has low melting point or A fuse should be made of material of low melting point - Give scientific reason.

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Question

The material used for fuse has low melting point or A fuse should be made of material of low melting point

Answer

A fuse is used to protect a circuit and the appliances connect in the circuit by stopping the flow of an excessive electric current.

For this, a fuse is connected in series in the circuit.

When the current in the circuit passes through the fuse, its temperature increases.

When the current exceed the specified value, the fuse must melt to break the circuit.

For this, the material used for a fuse has low melting point.

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