BASIC ELECTRICAL PRACTICE - Practice Mode

1) Calculate the value of resistance connected to the supply voltage of 100V and current through 4 A?

0.4 ohm 0.04 ohm 25 ohm 400 ohm

Correct Answer: 25 ohm

2) What is the S.I unit of specific resistance?

Ohm/cm Ohm/metre<sup>2</sup> Ohm-metre Micro ohm/cm<sup>2</sup>

Correct Answer: Ohm-metre

Explanation:

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3) What is the specific resistance value of copper conductor?

1.72 micro ohm/cm<sup>2</sup> 1.72 micro ohm 1.72 ohm /cm<sup>2</sup> 1.72 micro ohmmeter

Correct Answer: 1.72 micro ohm/cm<sup>2</sup>

4) What is the effect in resistance of the conductor, if its diameter is doubled?

Increase to two times Increase to four times Decrease to half the value Decrease to 1/4 th value

Correct Answer: Decrease to 1/4 th value

5) Which is directly proportional to the resistance?

Area of cross section Length Resistivity Temperature

Correct Answer: Length

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