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Ohm_s Law and Resistance MCQs for Competitive Exams

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Ohm_s Law and Resistance MCQs for Competitive Exams

Practice with answers, explanations, and exam-focused revision notes.

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Topic Notes: Ohm_s Law and Resistance

These notes summarize the key preparation context before you attempt the MCQs. Review the topic focus, then practice the questions below with answers and explanations.

Quick Overview

Ohm_s Law and Resistance MCQs in Physics are useful for candidates who need targeted practice for CSS, PMS, FPSC, PPSC, NTS, entry tests, and other competitive exams in Pakistan. This topic page is designed for quick revision, repeated practice, and exam-focused preparation.

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31
According to Ohm's Law, if the resistance of a circuit is reduced to half while the voltage remains constant, what happens to the current?
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32
Which scientist established the fundamental relationship between potential difference (V) and electric current (I) in a conductor?
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33
In a series circuit with a constant voltage source, how does the total current change as additional lamps are connected in series?
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34
Calculate the equivalent resistance of a circuit containing two 10Ω resistors in parallel, which are then connected in series with a third 10Ω resistor.
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35
According to Ohm's Law, how is the potential difference (V) mathematically related to current (I) and resistance (R)?
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36
How does the voltage across individual resistors compare when they are connected in a parallel configuration?
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37
Which material is commonly utilized as a heating element in electrical appliances due to its high resistivity?
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38
How does a very low resistance in an electrical circuit affect the magnitude of the current?
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39
Why are manganin or constantan alloys preferred for manufacturing standard wire-bound resistors?
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40
If the resistance of the conductor is doubled then the electric current is halved. What causes this:
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