NEET Physics: Current Electricity — MCQ Test 22

Q6. A cell of emf \( 9 \, \text{V} \) and internal resistance \( 1 \, \Omega \) is connected to a \( 8 \, \Omega \) resistor. What is the terminal voltage?

Q7. Why does a filament lamp deviate from Ohm’s law as current increases?

Q8. A \( 3 \, \text{m} \) long wire with a cross-sectional area of \( 1.5 \times 10^{-6} \, \text{m}^2 \) has a resistance of \( 6 \, \Omega \). What is the current density when a potential difference of \( 12 \, \text{V} \) is applied?

Q9. A Wheatstone bridge has \( R_1 = 25 \, \Omega \), \( R_2 = 50 \, \Omega \), \( R_3 = 20 \, \Omega \). What is \( R_4 \) for balance?

Q10. A wire of length \( 8 \, \text{m} \) and cross-sectional area \( 2 \times 10^{-6} \, \text{m}^2 \) has a resistance of \( 16 \, \Omega \). What is the resistivity of the material?

NEET Physics — Current Electricity

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Medium

A copper wire of cross-sectional area \( 5 \times 10^{-7} \, \text{m}^2 \) carries a current of \( 1 \, \text{A} \). If \( n = 8.5 \times 10^{28} \, \text{m}^{-3} \) and \( e = 1.6 \times 10^{-19} \, \text{C} \), what is the drift speed?

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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 Sectional, Resistance, Resistivity, Material, Velocity, and Electrons.

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 copper wire of cross-sectional area \( 5 \times 10^{-7} \, \text{m}^2 \) carries a current of \( 1 \, \text{A} \). 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. \( 1.2 \times 10^{-4} \, \text{m/s} \)
  • B. \( 1.47 \times 10^{-4} \, \text{m/s} \)
  • C. \( 1.6 \times 10^{-4} \, \text{m/s} \)
  • D. \( 1.8 \times 10^{-4} \, \text{m/s} \)

Q2. A wire of length \( 9 \, \text{m} \) and cross-sectional area \( 1.5 \times 10^{-6} \, \text{m}^2 \) has a resistance of \( 18 \, \Omega \). What is the resistivity of the material?

  • A. \( 3.0 \times 10^{-6} \, \Omega \text{m} \)
  • B. \( 3.5 \times 10^{-6} \, \Omega \text{m} \)
  • C. \( 4.0 \times 10^{-6} \, \Omega \text{m} \)
  • D. \( 4.5 \times 10^{-6} \, \Omega \text{m} \)

Q3. What happens to the drift velocity of electrons in a conductor if the conductor’s temperature increases while the applied electric field remains constant?

  • A. It increases
  • B. It remains constant
  • C. It decreases
  • D. It doubles

Q4. A wire has a resistance of \( 18 \, \Omega \) at \( 20^\circ \text{C} \) and \( 19.8 \, \Omega \) at \( 80^\circ \text{C} \). What is the temperature coefficient of resistivity?

  • A. \( 1.67 \times 10^{-3} \, ^\circ\text{C}^{-1} \)
  • B. \( 1.8 \times 10^{-3} \, ^\circ\text{C}^{-1} \)
  • C. \( 2.0 \times 10^{-3} \, ^\circ\text{C}^{-1} \)
  • D. \( 2.2 \times 10^{-3} \, ^\circ\text{C}^{-1} \)

Q5. A wire has a resistance of \( 10 \, \Omega \) at \( 20^\circ \text{C} \) and \( 12 \, \Omega \) at \( 100^\circ \text{C} \). What is the temperature coefficient of resistivity?

  • A. \( 2.0 \times 10^{-4} \, ^\circ\text{C}^{-1} \)
  • B. \( 2.5 \times 10^{-4} \, ^\circ\text{C}^{-1} \)
  • C. \( 3.0 \times 10^{-4} \, ^\circ\text{C}^{-1} \)
  • D. \( 3.5 \times 10^{-4} \, ^\circ\text{C}^{-1} \)

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