Which of the following pairs is not correctly matched?

Consider the following statements:
$1.$ Ohm's law can be applied for semiconductor.
$2.$ Electrical resistance is having unit mho.
$3.$ The permanent magnet can be made from cobalt.
$4.$ A fuse wire is made up of an alloy of tin and aluminium. 

Which of the statement(s) given above is/are correct?

A copper voltmeter measures the:

$1$. Quantity of current passing through the circuit.

$2$. Amount of copper deposited.

$3$. Resistance of the circuit.

Which of these statement(s) is/are correct?