NEET Physics: Current Electricity — MCQ Test 21

Q6. A copper wire of length \( 2 \, \text{m} \) and cross-sectional area \( 2 \times 10^{-6} \, \text{m}^2 \) carries a current of \( 2 \, \text{A} \). If the number density of free electrons in copper is \( 8.5 \times 10^{28} \, \text{m}^{-3} \) and \( e = 1.6 \times 10^{-19} \, \text{C} \), what is the drift speed of the electrons?

Q7. A \( 7 \, \Omega \) resistor carries a current of \( 2 \, \text{A} \) for \( 25 \, \text{s} \). What is the energy dissipated?

Q8. Why does the resistivity of an insulator decrease dramatically when impurities are added?

Q9. A copper wire carries \( 4 \, \text{A} \) with a drift speed of \( 1.0 \times 10^{-4} \, \text{m/s} \). 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?

Q10. A conductor of length \( 1 \, \text{m} \) and cross-sectional area \( 1 \times 10^{-6} \, \text{m}^2 \) has a resistance of \( 2 \, \Omega \). What is the resistivity of the material?

NEET Physics — Current Electricity

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A \( 12 \, \text{V} \) battery with \( 2 \, \Omega \) internal resistance delivers a current of \( 3 \, \text{A} \) to a resistor. What is the resistance of the 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, Delivers, Resistor, Superconductor, and Critical.

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 \( 12 \, \text{V} \) battery with \( 2 \, \Omega \) internal resistance delivers a current of \( 3 \, \text{A} \) to a resistor. What is the resistance of the resistor?

  • A. \( 1.5 \, \Omega \)
  • B. \( 1.8 \, \Omega \)
  • C. \( 2.0 \, \Omega \)
  • D. \( 2.5 \, \Omega \)

Q2. Why does a superconductor exhibit zero resistance below its critical temperature?

  • A. Electrons stop moving
  • B. No collisions with lattice
  • C. Voltage becomes infinite
  • D. Charge carriers vanish

Q3. A nichrome wire has a resistance of \( 50 \, \Omega \) at \( 25^\circ \text{C} \) and \( 55 \, \Omega \) at a higher temperature. If \( \alpha = 1.7 \times 10^{-4} \, ^\circ\text{C}^{-1} \), what is the temperature?

  • A. \( 550^\circ \text{C} \)
  • B. \( 613^\circ \text{C} \)
  • C. \( 650^\circ \text{C} \)
  • D. \( 700^\circ \text{C} \)

Q4. Why does the equivalent resistance of two resistors in parallel always lie between zero and the smallest individual resistance?

  • A. Voltage cancels out
  • B. Additional paths reduce total resistance
  • C. Current doubles
  • D. Resistances add inversely

Q5. A \( 5 \, \Omega \) resistor carries a current of \( 3 \, \text{A} \) for \( 20 \, \text{s} \). What is the energy dissipated?

  • A. \( 600 \, \text{J} \)
  • B. \( 750 \, \text{J} \)
  • C. \( 800 \, \text{J} \)
  • D. \( 900 \, \text{J} \)

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