NEET Physics: Current Electricity — MCQ Test 8

Q6. A wire of length \( 3 \, \text{m} \) and resistance \( 6 \, \Omega \) is stretched to \( 6 \, \text{m} \). What is the new resistance?

Q7. A copper wire of cross-sectional area \( 1 \times 10^{-6} \, \text{m}^2 \) carries a current of \( 1.5 \, \text{A} \). If \( n = 8.5 \times 10^{28} \, \text{m}^{-3} \) and \( e = 1.6 \times 10^{-19} \, \text{C} \), what is the drift speed?

Q8. Why does the drift velocity of electrons in a conductor remain constant despite continuous acceleration by an electric field?

Q9. A circuit has a \( 15 \, \text{V} \) battery with \( 2 \, \Omega \) internal resistance and three resistors \( 3 \, \Omega \), \( 6 \, \Omega \), \( 12 \, \Omega \) in parallel. What is the current through the \( 6 \, \Omega \) resistor?

Q10. A Wheatstone bridge with \( R_1 = 5 \, \Omega \), \( R_2 = 10 \, \Omega \), \( R_3 = 15 \, \Omega \), \( R_4 = 30 \, \Omega \) has a \( 18 \, \text{V} \) battery across AC and a galvanometer (\( 3 \, \Omega \)) across BD. What is the current through the galvanometer?

NEET Physics — Current Electricity

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When two identical resistors are connected in series and then in parallel, how does the equivalent resistance change?

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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 Identical, Resistors, Connected, Parallel, Equivalent, and Resistance.

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. When two identical resistors are connected in series and then in parallel, how does the equivalent resistance change?

  • A. Series resistance is four times parallel resistance
  • B. Parallel resistance is four times series resistance
  • C. They become equal
  • D. Series resistance doubles

Q2. A Wheatstone bridge has \( R_1 = 16 \, \Omega \), \( R_2 = 32 \, \Omega \), \( R_3 = 20 \, \Omega \). What is \( R_4 \) for balance?

  • A. \( 35 \, \Omega \)
  • B. \( 40 \, \Omega \)
  • C. \( 45 \, \Omega \)
  • D. \( 50 \, \Omega \)

Q3. A wire of length \( 12 \, \text{m} \) and cross-sectional area \( 3 \times 10^{-6} \, \text{m}^2 \) has a resistance of \( 24 \, \Omega \). What is the resistivity of the material?

  • A. \( 6.0 \times 10^{-6} \, \Omega \text{m} \)
  • B. \( 6.5 \times 10^{-6} \, \Omega \text{m} \)
  • C. \( 7.0 \times 10^{-6} \, \Omega \text{m} \)
  • D. \( 7.5 \times 10^{-6} \, \Omega \text{m} \)

Q4. Two cells in parallel have emf \( 6 \, \text{V} \) and \( 3 \, \text{V} \) with internal resistances \( 3 \, \Omega \) and \( 1 \, \Omega \). What is the equivalent emf?

  • A. \( 3.5 \, \text{V} \)
  • B. \( 3.75 \, \text{V} \)
  • C. \( 4.0 \, \text{V} \)
  • D. \( 4.5 \, \text{V} \)

Q5. In a circuit with two resistors in series, why does the voltage divide proportionally to their resistances?

  • A. Current doubles
  • B. Resistance cancels out
  • C. Voltage drop is proportional to resistance
  • D. Electric field varies

+ 5 more questions in the actual test

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