Question

Which of the following is a poor conductor of electricity?

• A. Pb
• B. Cu
• C. Ag
• D. Al

Hint:

Electrical conductivity order: Ag>Cu>Au>Al>Mg>Zn>Fe>Pb.
Lead is a poor conductor, hence used in batteries (not for wiring).

Answer 1

The Correct Option is A

Step 1: Understand electrical conductivity of metals.
All metals conduct electricity, but their conductivity varies:

• Silver (Ag): Best conductor of electricity
• Copper (Cu): Second best conductor, widely used in electrical wiring
• Aluminum (Al): Good conductor, lightweight, used in power lines
• Lead (Pb): Poor conductor compared to other metals

Step 2: Compare conductivity.
Conductivity order (best to worst): \[ \text{Ag}>\text{Cu}>\text{Al}>\text{Pb} \]
Step 3: Analyze each option.

• (A) Pb (Lead): Poor conductor. Lead has high resistance and is not used for electrical wiring.
• (B) Cu (Copper): Excellent conductor, used in wires.
• (C) Ag (Silver): Best conductor, but expensive.
• (D) Al (Aluminum): Good conductor, used in transmission lines.

Final Answer: (A) Pb