Which among the following is incorrectly matched?

i)            Conductors: Mercury, aluminium, iron and metal coin

ii)            Resistors: Nichrome and manganin

iii)            Insulators: Rubber, polythene, wood, paper, Thermocol and Bakelite

iv)            Semiconductors: Germanium and Silicon

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i only

ii and iii only

iv only

All are correct

answer is D.

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Detailed Solution

Conductors: Mercury, aluminium, iron and metal coin, Resistors: Nichrome and manganin, Insulators: Rubber, polythene, wood, paper, Thermocol and Bakelite and Semiconductors: Germanium and Silicon are incorrectly matched.
An electrical conductor allows electric charges to flow through them easily. The property of conductors to "conduct" electricity is called conductivity. Such materials offer less opposition or resistance to the flow of charges. Conducting materials allows easy charge transfer because of electrons' free movement through them. Good conductors are defined as materials with a very low electrical resistance that allow flowing electric charge. Aluminium and copper, for example.
Resistor materials have a higher relative resistance than conductors—for example, manganin and nichrome.
Insulators are substances with an infinitely high electrical resistance and don't allow any charge to flow into them. Rubber and wood, as examples.
Despite not being as effective at conducting electricity as conductors, semiconductors nevertheless have their use. Germanium and silicon are a few examples of semiconductors.

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