NEET Physics: Current Electricity — MCQ Test 10

Q6. A wire has a resistance of \( 25 \, \Omega \) at \( 20^\circ \text{C} \) and \( 27.5 \, \Omega \) at \( 90^\circ \text{C} \). What is the temperature coefficient of resistivity?

Q7. Two cells in parallel have emf \( 12 \, \text{V} \) and \( 6 \, \text{V} \) with internal resistances \( 4 \, \Omega \) and \( 2 \, \Omega \). What is the equivalent emf?

Q8. A circuit has a \( 30 \, \text{V} \) battery with \( 3 \, \Omega \) internal resistance and three resistors \( 3 \, \Omega \), \( 6 \, \Omega \), \( 12 \, \Omega \) in parallel. What is the current through the \( 6 \, \Omega \) resistor?

Q9. A \( 12 \, \text{V} \) battery with \( 1 \, \Omega \) internal resistance delivers a current of \( 2 \, \text{A} \) to a resistor. What is the resistance of the resistor?

Q10. What happens to the total resistance of a circuit when an additional resistor is added in parallel to an existing resistor?

NEET Physics — Current Electricity

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A conductor has a resistivity of \( 6 \times 10^{-8} \, \Omega \text{m} \) and \( \alpha = 4 \times 10^{-3} \, ^\circ\text{C}^{-1} \) at \( 20^\circ \text{C} \). What is its resistivity at \( 90^\circ \text{C} \)?

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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 Conductor, Resistivity, Sectional, Resistor, Dissipated, and Wheatstone.

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 conductor has a resistivity of \( 6 \times 10^{-8} \, \Omega \text{m} \) and \( \alpha = 4 \times 10^{-3} \, ^\circ\text{C}^{-1} \) at \( 20^\circ \text{C} \). What is its resistivity at \( 90^\circ \text{C} \)?

  • A. \( 7.2 \times 10^{-8} \, \Omega \text{m} \)
  • B. \( 7.5 \times 10^{-8} \, \Omega \text{m} \)
  • C. \( 7.68 \times 10^{-8} \, \Omega \text{m} \)
  • D. \( 8.0 \times 10^{-8} \, \Omega \text{m} \)

Q2. A copper wire carries \( 3.4 \, \text{A} \) with a drift speed of \( 1.25 \times 10^{-4} \, \text{m/s} \). If \( n = 8.5 \times 10^{28} \, \text{m}^{-3} \) and \( e = 1.6 \times 10^{-19} \, \text{C} \), what is the cross-sectional area?

  • A. \( 1.8 \times 10^{-5} \, \text{m}^2 \)
  • B. \( 1.9 \times 10^{-5} \, \text{m}^2 \)
  • C. \( 1.95 \times 10^{-5} \, \text{m}^2 \)
  • D. \( 2.0 \times 10^{-5} \, \text{m}^2 \)

Q3. A \( 5 \, \Omega \) resistor carries a current of \( 4 \, \text{A} \) for \( 15 \, \text{s} \). What is the energy dissipated?

  • A. \( 1000 \, \text{J} \)
  • B. \( 1100 \, \text{J} \)
  • C. \( 1150 \, \text{J} \)
  • D. \( 1200 \, \text{J} \)

Q4. A Wheatstone bridge has \( R_1 = 30 \, \Omega \), \( R_2 = 60 \, \Omega \), \( R_3 = 25 \, \Omega \). What is \( R_4 \) for balance?

  • A. \( 45 \, \Omega \)
  • B. \( 50 \, \Omega \)
  • C. \( 55 \, \Omega \)
  • D. \( 60 \, \Omega \)

Q5. A circuit has a \( 6 \, \text{V} \) battery with \( 1 \, \Omega \) internal resistance and two resistors \( 2 \, \Omega \) and \( 3 \, \Omega \) in parallel. What is the total current?

  • A. \( 2.0 \, \text{A} \)
  • B. \( 2.5 \, \text{A} \)
  • C. \( 2.73 \, \text{A} \)
  • D. \( 3.0 \, \text{A} \)

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