NEET Physics: Current Electricity — MCQ Test 11

Q6. Why does the emf of a cell depend on its chemical composition rather than its size?

Q7. A cell of emf \( 4 \, \text{V} \) and internal resistance \( 0.5 \, \Omega \) is connected to a \( 3.5 \, \Omega \) resistor. What is the current in the circuit?

Q8. A copper wire of cross-sectional area \( 4 \times 10^{-7} \, \text{m}^2 \) carries a current of \( 1.36 \, \text{A} \). If \( n = 8.5 \times 10^{28} \, \text{m}^{-3} \) and \( e = 1.6 \times 10^{-19} \, \text{C} \), what is the drift speed?

Q9. What happens to the current density in a conductor if the conductor is stretched to twice its original length without changing the applied voltage?

Q10. A Wheatstone bridge with \( R_1 = 6 \, \Omega \), \( R_2 = 12 \, \Omega \), \( R_3 = 9 \, \Omega \), \( R_4 = 18 \, \Omega \) has a \( 15 \, \text{V} \) battery across AC and a galvanometer (\( 5 \, \Omega \)) across BD. What is the current through the galvanometer?

NEET Physics — Current Electricity

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A circuit has a \( 12 \, \text{V} \) battery with \( 2 \, \Omega \) internal resistance and three resistors \( 3 \, \Omega \), \( 6 \, \Omega \), \( 9 \, \Omega \) in parallel. What is the current through the \( 9 \, \Omega \) resistor?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Current Electricity. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Internal, Resistance, Resistors, Parallel, Resistor, and Dissipated.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. A circuit has a \( 12 \, \text{V} \) battery with \( 2 \, \Omega \) internal resistance and three resistors \( 3 \, \Omega \), \( 6 \, \Omega \), \( 9 \, \Omega \) in parallel. What is the current through the \( 9 \, \Omega \) resistor?

  • A. \( 0.4 \, \text{A} \)
  • B. \( 0.5 \, \text{A} \)
  • C. \( 0.55 \, \text{A} \)
  • D. \( 0.6 \, \text{A} \)

Q2. A \( 6 \, \Omega \) resistor carries a current of \( 4 \, \text{A} \) for \( 5 \, \text{s} \). What is the energy dissipated?

  • A. \( 400 \, \text{J} \)
  • B. \( 450 \, \text{J} \)
  • C. \( 460 \, \text{J} \)
  • D. \( 480 \, \text{J} \)

Q3. A copper wire of cross-sectional area \( 4 \times 10^{-7} \, \text{m}^2 \) carries a current of \( 1.2 \, \text{A} \). If \( n = 8.5 \times 10^{28} \, \text{m}^{-3} \) and \( e = 1.6 \times 10^{-19} \, \text{C} \), what is the drift speed?

  • A. \( 2.0 \times 10^{-4} \, \text{m/s} \)
  • B. \( 2.21 \times 10^{-4} \, \text{m/s} \)
  • C. \( 2.4 \times 10^{-4} \, \text{m/s} \)
  • D. \( 2.6 \times 10^{-4} \, \text{m/s} \)

Q4. A circuit has a \( 24 \, \text{V} \) battery with \( 3 \, \Omega \) internal resistance and three resistors \( 6 \, \Omega \), \( 12 \, \Omega \), \( 24 \, \Omega \) in parallel. What is the current through the \( 12 \, \Omega \) resistor?

  • A. \( 0.9 \, \text{A} \)
  • B. \( 1.0 \, \text{A} \)
  • C. \( 1.05 \, \text{A} \)
  • D. \( 1.07 \, \text{A} \)

Q5. Why is high voltage used in power transmission lines to reduce energy loss?

  • A. Increases conductor resistance
  • B. Reduces line length
  • C. Increases current efficiency
  • D. Reduces current and thus resistive losses

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