Current, Resistance and Ohms Law

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Current, Resistance and Ohms Law MCQ & Objective Questions

Understanding "Current, Resistance and Ohms Law" is crucial for students preparing for school and competitive exams in India. This topic not only forms the foundation of electrical concepts but also frequently appears in various examination formats. Practicing MCQs and objective questions on this subject helps students enhance their problem-solving skills and boosts their confidence, leading to better scores in exams.

What You Will Practise Here

  • Fundamental definitions of current, resistance, and voltage.
  • Ohm's Law and its applications in real-world scenarios.
  • Calculating resistance in series and parallel circuits.
  • Understanding the relationship between current, voltage, and resistance.
  • Key formulas related to electrical circuits and their derivations.
  • Diagrams illustrating circuit configurations and components.
  • Common units of measurement and their conversions.

Exam Relevance

The concepts of Current, Resistance, and Ohms Law are integral to the physics syllabus across CBSE, State Boards, NEET, and JEE. These topics often feature in objective questions, problem-solving sections, and theoretical explanations. Students can expect questions that require them to apply Ohm's Law to calculate unknown values or analyze circuit behavior, making it essential to master these concepts for effective exam preparation.

Common Mistakes Students Make

  • Confusing the relationship between current, voltage, and resistance.
  • Misapplying Ohm's Law in complex circuit problems.
  • Overlooking the significance of units while calculating resistance or current.
  • Failing to differentiate between series and parallel circuits in calculations.

FAQs

Question: What is Ohm's Law?
Answer: Ohm's Law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points, provided the temperature remains constant.

Question: How do I calculate total resistance in a series circuit?
Answer: In a series circuit, the total resistance is the sum of all individual resistances: R_total = R1 + R2 + R3 + ...

Start solving practice MCQs on Current, Resistance and Ohms Law today to test your understanding and prepare effectively for your upcoming exams. Mastering these concepts will not only help you in exams but also in building a strong foundation in physics.

Q. If a capacitor of 5 µF is charged to a voltage of 10 V, what is the charge stored in the capacitor?
  • A. 50 µC
  • B. 100 µC
  • C. 25 µC
  • D. 75 µC
Q. If a circuit has a total current of 5 A and a total resistance of 10 Ω, what is the total voltage?
  • A. 50 V
  • B. 25 V
  • C. 10 V
  • D. 5 V
Q. If a circuit has a voltage of 12 V and a resistance of 4 Ω, what is the current flowing through the circuit?
  • A. 3 A
  • B. 4 A
  • C. 2 A
  • D. 6 A
Q. In a circuit with a 12 V battery and a resistor of 4 Ω, what is the current flowing through the circuit?
  • A. 3 A
  • B. 4 A
  • C. 2 A
  • D. 6 A
Q. In a parallel circuit with a 12 V supply, what is the voltage across each resistor?
  • A. 12 V
  • B. 6 V
  • C. 24 V
  • D. 0 V
Q. What is the capacitance of a capacitor that stores 0.01 C of charge at a voltage of 5 V?
  • A. 0.002 F
  • B. 0.01 F
  • C. 0.005 F
  • D. 0.02 F
Q. What is the current through a 10 Ω resistor if the voltage across it is 30 V?
  • A. 3 A
  • B. 1 A
  • C. 5 A
  • D. 2 A
Q. What is the energy stored in a capacitor of 4 µF charged to a voltage of 12 V?
  • A. 0.288 mJ
  • B. 0.576 mJ
  • C. 0.144 mJ
  • D. 0.072 mJ
Q. What is the equivalent capacitance of two capacitors of 4 µF and 6 µF connected in series?
  • A. 2.4 µF
  • B. 10 µF
  • C. 1.5 µF
  • D. 3.6 µF
Q. What is the power dissipated in a resistor of 8 Ω carrying a current of 2 A?
  • A. 16 W
  • B. 4 W
  • C. 8 W
  • D. 2 W
Q. What is the total resistance of three resistors of 2 Ω, 3 Ω, and 5 Ω connected in series?
  • A. 10 Ω
  • B. 5 Ω
  • C. 3 Ω
  • D. 2 Ω
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