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SSC CHSL 2019 PYQ — Question 37

SSC CHSL - 5th July 2019 - Shift 1 • General Awareness • Q37

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What is the SI unit of electrical resistance?

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Correct answer: B

Explanation

The correct answer is option 2, i.e. Ohm

The SI unit of electrical resistance is the ohm (Ω), named after physicist Georg Ohm. One ohm is defined as the resistance when a potential difference of one volt produces a current of one ampere. This unit quantifies how much a material resists the flow of electric current. 

Other options:

  1. Ampere (A) – Measures electric current, not resistance.

  2. Mole (mol) – Measures the amount of substance, unrelated to electricity.

  3. Volt (V) – Measures electrical potential difference, not resistance.

Thus, Ohm (Ω), as it directly quantifies resistance in an electrical circuit.