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Current Electricity

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Q. If a resistor has a resistance of 5 ohms and a current of 2 amperes flows through it, what is the voltage across the resistor?
  • A. 10 V
  • B. 5 V
  • C. 2.5 V
  • D. 1 V
Q. If a resistor is connected to a 9V battery and the current flowing through it is 3A, what is the resistance of the resistor?
  • A. 1 Ω
  • B. 3 Ω
  • C. 9 Ω
  • D. 27 Ω
Q. If a wire's length is doubled while keeping its cross-sectional area constant, how does its resistance change?
  • A. Remains the same
  • B. Doubles
  • C. Halves
  • D. Quadruples
Q. If one of the resistors in a Wheatstone bridge is replaced with a variable resistor, what is the effect on the balance condition?
  • A. It cannot be balanced
  • B. It can be balanced by adjusting the variable resistor
  • C. It will always be unbalanced
  • D. It will short-circuit the bridge
Q. If R1 = 10Ω, R2 = 15Ω, R3 = 5Ω, what should R4 be for the Wheatstone bridge to be balanced?
  • A. 7.5Ω
  • B. 10Ω
  • C. 12.5Ω
  • D. 15Ω
Q. If R1 = 10Ω, R2 = 20Ω, and R3 = 30Ω in a Wheatstone bridge, what should R4 be for the bridge to be balanced?
  • A. 15Ω
  • B. 20Ω
  • C. 25Ω
  • D. 30Ω
Q. If R1 = 10Ω, R2 = 20Ω, R3 = 30Ω, and R4 = 60Ω in a Wheatstone bridge, is the bridge balanced?
  • A. Yes
  • B. No
  • C. Depends on the voltage
  • D. Depends on the current
Q. If R1 = 2Ω, R2 = 3Ω, and R3 = 6Ω in a Wheatstone bridge, what is the value of R4 for balance?
  • A. 4Ω
  • B. 5Ω
  • C. 6Ω
  • D. 9Ω
Q. If R1 = 2Ω, R2 = 3Ω, and R3 = 6Ω, what is the value of R4 for the Wheatstone bridge to be balanced?
  • A. 4Ω
  • B. 5Ω
  • C. 6Ω
  • D. 8Ω
Q. If R1 = 5Ω, R2 = 10Ω, and R3 = 15Ω in a Wheatstone bridge, what is the value of R4 for balance?
  • A. 7.5Ω
  • B. 10Ω
  • C. 15Ω
  • D. 20Ω
Q. If R1 = 5Ω, R2 = 15Ω, R3 = 10Ω, what should R4 be for the Wheatstone bridge to be balanced?
  • A. 30Ω
  • B. 10Ω
  • C. 15Ω
  • D. 5Ω
Q. If the balance length of a potentiometer is 50cm for a cell of unknown emf, and the potential gradient is 4 V/m, what is the emf of the cell?
  • A. 2V
  • B. 4V
  • C. 6V
  • D. 8V
Q. If the balancing length of a potentiometer is found to be 40 cm for a cell of emf 2V, what is the potential gradient if the total length of the wire is 100 cm?
  • A. 5 V/m
  • B. 2 V/m
  • C. 4 V/m
  • D. 3 V/m
Q. If the cross-sectional area of a wire is doubled, how does its resistance change?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Increases four times
Q. If the cross-sectional area of a wire is doubled, what happens to its resistance?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Increases four times
Q. If the current in a circuit is 5 A and the resistance is 2 ohms, what is the power consumed in the circuit?
  • A. 10 W
  • B. 25 W
  • C. 5 W
  • D. 2.5 W
Q. If the current in a circuit is doubled while the resistance remains constant, what happens to the voltage?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the current in a circuit is halved, what happens to the power consumed by the circuit?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the current in a circuit is split into two branches with resistances R1 = 2Ω and R2 = 4Ω, what is the current through R1 if the total current is 6A?
  • A. 2A
  • B. 3A
  • C. 4A
  • D. 6A
Q. If the current through a 10Ω resistor is 2A, what is the voltage across the resistor?
  • A. 5V
  • B. 10V
  • C. 20V
  • D. 30V
Q. If the current through a conductor is doubled while the resistance remains constant, what happens to the power consumed?
  • A. It doubles
  • B. It triples
  • C. It remains the same
  • D. It halves
Q. If the current through a conductor is doubled, what happens to the power dissipated in the conductor?
  • A. It doubles
  • B. It quadruples
  • C. It remains the same
  • D. It halves
Q. If the current through a conductor is doubled, what happens to the resistance if the voltage remains constant?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the current through a resistor is 3A and the resistance is 4Ω, what is the voltage across the resistor?
  • A. 6V
  • B. 9V
  • C. 12V
  • D. 15V
Q. If the current through a resistor is doubled, what happens to the power consumed by the resistor?
  • A. Increases by 2 times
  • B. Increases by 4 times
  • C. Remains the same
  • D. Decreases by 2 times
Q. If the current through a resistor is doubled, what happens to the power dissipated in the resistor?
  • A. It halves
  • B. It doubles
  • C. It quadruples
  • D. It remains the same
Q. If the emf of a cell is 12 V and the potentiometer wire is 20 m long, what is the potential gradient if the wire is calibrated to give a reading of 0.6 V/m?
  • A. 12 V
  • B. 0.6 V/m
  • C. 0.3 V/m
  • D. 0.5 V/m
Q. If the emf of a cell is 2V and the potential gradient of the potentiometer wire is 4 V/m, what will be the balancing length?
  • A. 0.5 m
  • B. 1 m
  • C. 0.25 m
  • D. 0.75 m
Q. If the galvanometer in a Wheatstone bridge has a high resistance, what is the effect on the sensitivity of the bridge?
  • A. Increases sensitivity
  • B. Decreases sensitivity
  • C. No effect
  • D. Depends on the resistances
Q. If the galvanometer in a Wheatstone bridge has a resistance of 5Ω and the bridge is balanced, what is the current through the galvanometer?
  • A. Zero.
  • B. 5A.
  • C. 1A.
  • D. 10A.
Showing 121 to 150 of 607 (21 Pages)

Current Electricity MCQ & Objective Questions

Current Electricity is a crucial topic in physics that students must master for their exams. Understanding this concept not only helps in grasping fundamental principles but also significantly boosts your performance in objective questions. Practicing MCQs and important questions related to Current Electricity can enhance your exam preparation and increase your chances of scoring higher marks.

What You Will Practise Here

  • Ohm's Law and its applications
  • Series and parallel circuits
  • Electrical power and energy calculations
  • Resistance, resistivity, and factors affecting resistance
  • Kirchhoff's laws and their practical applications
  • Concept of current, voltage, and their relationship
  • Diagrams and circuit analysis techniques

Exam Relevance

The topic of Current Electricity is frequently tested in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that assess their understanding of fundamental concepts, application of formulas, and problem-solving skills. Common question patterns include numerical problems, theoretical questions, and circuit analysis, making it essential to be well-prepared with Current Electricity MCQ questions.

Common Mistakes Students Make

  • Confusing current with voltage and their units
  • Misapplying Ohm's Law in complex circuits
  • Overlooking the effects of temperature on resistance
  • Failing to differentiate between series and parallel connections
  • Neglecting to draw circuit diagrams for better understanding

FAQs

Question: What is the formula for calculating electrical power?
Answer: The formula for electrical power is P = VI, where P is power, V is voltage, and I is current.

Question: How does resistance change in series and parallel circuits?
Answer: In series circuits, total resistance increases, while in parallel circuits, total resistance decreases.

Now is the time to enhance your understanding of Current Electricity! Dive into our practice MCQs and test your knowledge to ensure you are well-prepared for your exams. Start solving today and boost your confidence!

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