Question

The metals used in the electric industry are ______________.
a)Copper
b)Aluminium
c)Mica
d)All of these

Answer 1

Hint: Most metals allow the flow of charges in one or all directions. That makes them good conductors of electricity and hence are used in most of the electric industries and electrical appliances.

Complete Answer: The material that allows the flow of charge in one or all directions are called conductors of electricity. Most metals are good conductors of electricity.
Copper is a good conductor of electricity. It has good ductile strength. It is used in most of the electrical appliances and eclectic industries.
Aluminium is another good conductor of electricity. It is lighter than copper. It also has good conductivity and malleability properties. It is used to combine heavy metals like iron with extreme lightness. It is widely used in electrical industries especially where light weight is required like huge electric towers.
Mica is also used in electric industries. It has an excellent dielectric strength. It has low power loss factors. Due to its insulating properties and resistance to high voltage it is widely used in various electric industries and electrical appliances.

Looking at the options given:
Option a: Copper is a good conductor of electricity but it is not the solely one in given options. It is an incorrect answer.
Option b: Aluminum is used in electrical appliances due to its conductivity and malleability properties. But other options also qualify for the same. So it cannot be solely the one. It is an incorrect answer.
Option c: Mica because of its dielectric strength and low power loss factors qualify for its application in electric industries. But other given options also qualify for the same. It is an incorrect answer.
Option d: Copper, Aluminium and Mica all three are used in electric industries. It is the correct answer.

Option ‘d’ is correct.

Note: Malleability is one of the physical properties of metals that permits them to be hammered, pressed or rolled into thin sheets without breaking. Ductility is another physical property that allows them to be stretched into thin wires.