Which one of the following is an insulator?

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ALP CBT 2 Electrician Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. Copper
  2. Silver
  3. Plastic
  4. Iron

Answer (Detailed Solution Below)

Option 3 : Plastic
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Detailed Solution

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In  the above question except ‘Plastic’, all given options are the examples of conductors

Table differentiating Good conductors, fair conductors & Insulators is given below

Good Conductors

Fair Conductors

Good Insulators ( Non – conductors)

Iron

Carbon

Plastic

Gold

Human body

Oil

Silver

Moist human skin

Fur

Copper

Saltwater

Silk

Aluminum

Acid solution

Dry wood

Magnesium

Earth

Porcelain, glass

Platinum

Water vapors ( in the air)

Rubber

Tungsten

 

Ebonite

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