The resistivity of alloys is:(a) very low (b) generally lower than its constituent metals(c) more than resistivity of insulators (d) very high

The resistivity of alloys is generally higher than its constituent metals. This is because alloys are made up of two or more metals, and the impurities and irregularities in the structure of the alloy cause more scattering of electrons. This increases the resistivity. So, the correct answer is not (a) very low, not (b) generally lower than its constituent metals, and not (d) very high. It could be (c) more than resistivity of insulators, but it depends on the specific alloy and insulator being compared. Generally, alloys have higher resistivity than their constituent metals but lower than insulators.