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Railways PYQCBT 2 2017

RRB NTPC · Question 115

What is the minimum resistance that can be obtained using four resistors of 5 Ohm each?

  1. 1.5 Ohm

  2. 0.8 Ohm

  3. 20 Ohm

  4. 1.25 Ohm

Show answer & explanation

Answer: (D) 1.25 Ohm

Explanation

The minimum comes from connecting all four in parallel: 1/R = 4 × 1/5, so R = 5/4 = 1.25 Ω.