NEET Physics: Current Electricity — MCQ Test 24

Q6. A copper wire carries \( 2 \, \text{A} \) with a drift speed of \( 8 \times 10^{-5} \, \text{m/s} \). 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?

Q7. What is the physical significance of the temperature coefficient of resistivity being positive for metals?

Q8. A conductor has a resistivity of \( 8 \times 10^{-8} \, \Omega \text{m} \) and \( \alpha = 4 \times 10^{-3} \, ^\circ\text{C}^{-1} \) at \( 20^\circ \text{C} \). What is its resistivity at \( 70^\circ \text{C} \)?

Q9. A Wheatstone bridge has \( R_1 = 18 \, \Omega \), \( R_2 = 36 \, \Omega \), \( R_3 = 12 \, \Omega \). What is \( R_4 \) for balance?

Q10. A circuit has a \( 10 \, \text{V} \) battery with \( 1 \, \Omega \) internal resistance and two resistors \( 5 \, \Omega \) and \( 10 \, \Omega \) in parallel. What is the total current?

NEET Physics — Current Electricity

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A \( 15 \, \text{V} \) battery with \( 1 \, \Omega \) internal resistance delivers a current of \( 2.5 \, \text{A} \) 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, Sectional, and Dissipated.

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Preview of Questions in this Test

Q1. A \( 15 \, \text{V} \) battery with \( 1 \, \Omega \) internal resistance delivers a current of \( 2.5 \, \text{A} \) to a resistor. What is the resistance of the resistor?

  • A. \( 4.0 \, \Omega \)
  • B. \( 4.5 \, \Omega \)
  • C. \( 5.0 \, \Omega \)
  • D. \( 5.5 \, \Omega \)

Q2. A copper wire carries \( 2.72 \, \text{A} \) with a drift speed of \( 8 \times 10^{-5} \, \text{m/s} \). 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. \( 2.2 \times 10^{-5} \, \text{m}^2 \)
  • B. \( 2.4 \times 10^{-5} \, \text{m}^2 \)
  • C. \( 2.45 \times 10^{-5} \, \text{m}^2 \)
  • D. \( 2.5 \times 10^{-5} \, \text{m}^2 \)

Q3. Why does the power dissipated in a resistor increase quadratically with current?

  • A. Voltage increases linearly
  • B. Power depends on current squared
  • C. Resistance decreases
  • D. Energy loss cancels out

Q4. A wire of length \( 6 \, \text{m} \) and cross-sectional area \( 5 \times 10^{-6} \, \text{m}^2 \) has a resistance of \( 12 \, \Omega \). What is the resistivity of the material?

  • A. \( 1.0 \times 10^{-5} \, \Omega \text{m} \)
  • B. \( 1.2 \times 10^{-5} \, \Omega \text{m} \)
  • C. \( 1.5 \times 10^{-5} \, \Omega \text{m} \)
  • D. \( 1.8 \times 10^{-5} \, \Omega \text{m} \)

Q5. In a circuit with a battery, why does the internal resistance of the battery affect the maximum power delivered to an external load?

  • A. Increases emf
  • B. Reduces voltage drop
  • C. Increases total resistance
  • D. Limits current through the circuit

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