The poorest in electrical conductivity among the following metals is 

  1. Silver
  2. Copper
  3. Gold
  4. Aluminium

Answer (Detailed Solution Below)

Option 4 : Aluminium
Free
RRB Group D Full Test 1
100 Qs. 100 Marks 90 Mins

Detailed Solution

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CONCEPT:

  • Electrical Conductivity: It is a property of a material that shows the ability of a material to carry current.
    • It is the opposite of electrical resistivity.
  • The below table shows the electrical conductivity of different materials:
Position Metal Conductivity S/m × 106
1. Silver 6289
2. Copper 5977
3.  Gold 4255
4. Aluminum 3766
5. Iron 1029

EXPLANATION:

  • From the given options, Silver has the highest electrical conductivity, and Aluminum has the least.
  • On a scale of 0 to 100 for electrical conductivity, silver ranks 100, with copper at 97 and gold at 76, aluminum at 60.
  • Hence the correct answer is option 4.

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