Previous Year Question
Why are electrical wires used with proper insulation in lighting circuits of houses?
Correct answer: D
Explanation
Insulation separates live conductors from people, other conductors and conductive building parts. This reduces accidental contact, leakage and conductor-to-conductor faults, preventing electric shock and short circuits.
Step-by-step solution
Correct Answer
D — To prevent electric shock and short circuits
Explanation
Insulation separates live conductors from people, other conductors and conductive building parts. This reduces accidental contact, leakage and conductor-to-conductor faults, preventing electric shock and short circuits.
Key Concept
Shock and Short-Circuit Prevention
Exam Point
Insulation's safety job: keep live metal isolated.
Exam tip
Insulation's safety job: keep live metal isolated.
Quick method
Insulation's safety job: keep live metal isolated.