1.

Assertion: Electrical conductivity of copper inicreases with increase in temperature. Reason: The electrical conductivity of metals is due to the motion of electrons.

Answer»

if both ASSERTION and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false
if assertion is false but reason is true.

Solution :Electrical conductivity of copper decreases with increase in temperature because the METALLIC conductivity is due to the motion of ELECTRONS. On increasing temperature the motion of electron INCREASES which hindered in conductance of CURRENT. Hence, here assertion is false but the reason is true.


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