Electric Current, Voltage and Ohm's Law MCQs Quiz (30 Questions) for TLT, ECT, PST, JEST Exam | Physics

Electric Current, Voltage and Ohm's Law — MCQs Quiz

Subject: Physics  |  Topic: Ohm's Law (30 MCQs)

For TLT, ECT, PST, JEST & All Competitive Exams

Test your understanding of Electric Current, Voltage, Resistance and Ohm's Law with this interactive 30-MCQ quiz — covering units, instruments, V = I × R calculations, and series/parallel circuits. Every calculation has been verified. Select your answer for each question, then click Submit at the end to instantly see your score.

Instructions: Select one option for each question. After answering all questions, click the Submit button below to see your obtained marks and correct/incorrect answers.

1. What is the SI unit of electric current?

Volt Ampere Ohm Watt

2. What is the SI unit of potential difference (voltage)?

Ampere Ohm Volt Coulomb

3. What is the SI unit of electrical resistance?

Ohm Volt Ampere Watt

4. Which is the correct formula for Ohm's Law?

V = I / R V = I × R V = I + R V = R / I

5. Which instrument is used to measure electric current?

Voltmeter Thermometer Ammeter Barometer

6. A voltmeter is always connected in:

Series Parallel Either series or parallel Neither

7. An ammeter is always connected in:

Series Parallel Either series or parallel Neither

8. A voltage of 12 V is applied across a resistance of 4 Ω. Find the current.

2 A 3 A 4 A 8 A

9. A current of 2 A flows through a resistance of 10 Ω. Find the voltage.

5 V 12 V 20 V 8 V

10. A current of 5 A flows when a voltage of 30 V is applied. Find the resistance.

6 Ω 25 Ω 35 Ω 150 Ω

11. Two resistors of 3 Ω and 5 Ω are connected in series. Find the total resistance.

2 Ω 8 Ω 15 Ω 1.9 Ω

12. Two resistors of 6 Ω and 3 Ω are connected in parallel. Find the total resistance.

9 Ω 2 Ω 18 Ω 3 Ω

13. In a series circuit, which quantity is the same through all components?

Voltage Current Resistance Power

14. In a parallel circuit, which quantity is the same across every branch?

Current Resistance Voltage Charge

15. Electric current is the flow of:

Protons only Neutrons Electric charge Atoms

16. Which type of material allows electric current to pass through easily?

Insulator Conductor Rubber Glass

17. Which of the following is an insulator?

Copper Silver Rubber Aluminum

18. Which of the following best defines resistance?

The flow of electric charge The opposition to the flow of electric current Work done per unit charge The amount of charge stored

19. Which is the correct formula for current in terms of charge and time?

I = Q × t I = Q / t I = t / Q I = Q + t

20. If the voltage across a fixed resistance is doubled, the current will:

Become half Become double Remain the same Become zero

21. If the resistance is doubled while the voltage stays constant, the current will:

Become half Become double Remain the same Become four times

22. Which is the correct formula for finding resistance using Ohm's Law?

R = V × I R = V / I R = I / V R = V + I

23. A voltage of 20 V is applied across a resistance of 5 Ω. Find the current.

100 A 15 A 4 A 25 A

24. A current of 3 A flows through a resistance of 4 Ω. Find the voltage.

7 V 12 V 1.33 V 0.75 V

25. Three resistors of 2 Ω, 4 Ω, and 6 Ω are connected in series. Find the total resistance.

12 Ω 6 Ω 48 Ω 2 Ω

26. Two resistors of 4 Ω each are connected in parallel. Find the total resistance.

8 Ω 4 Ω 2 Ω 16 Ω

27. Ohm's Law is valid only if which physical condition remains constant?

Pressure Temperature Volume Mass

28. Who gave Ohm's Law?

Isaac Newton Alessandro Volta Georg Simon Ohm Michael Faraday

29. The unit "Volt" is named after which scientist?

André-Marie Ampère Alessandro Volta Georg Ohm James Watt

30. The unit "Ampere" is named after which scientist?

André-Marie Ampère Alessandro Volta Georg Ohm Isaac Newton

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