NEET Physics: Current Electricity — MCQ Test 17

Q6. A conductor has a resistivity of \( 7 \times 10^{-8} \, \Omega \text{m} \) and \( \alpha = 4 \times 10^{-3} \, ^\circ\text{C}^{-1} \) at \( 25^\circ \text{C} \). What is its resistivity at \( 85^\circ \text{C} \)?

Q7. A Wheatstone bridge with \( R_1 = 8 \, \Omega \), \( R_2 = 16 \, \Omega \), \( R_3 = 12 \, \Omega \), \( R_4 = 24 \, \Omega \) has a \( 10 \, \text{V} \) battery across AC and a galvanometer (\( 5 \, \Omega \)) across BD. What is the current through the galvanometer?

Q8. Why does the resistance of a conductor increase when it is stretched to double its length, assuming volume remains constant?

Q9. In a battery-powered circuit, if the external load resistance becomes very large, what happens to the current drawn from the battery?

Q10. A copper wire of cross-sectional area \( 2.5 \times 10^{-7} \, \text{m}^2 \) carries a current of \( 0.85 \, \text{A} \). If \( n = 8.5 \times 10^{28} \, \text{m}^{-3} \) and \( e = 1.6 \times 10^{-19} \, \text{C} \), what is the drift speed?

NEET Physics — Current Electricity

Free MCQ Test 17 of 24

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In a circuit with multiple loops, what does Kirchhoff’s junction rule imply about the currents at a node?

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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 Multiple, Kirchhoff, Junction, Currents, Entering, and Resistors.

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. In a circuit with multiple loops, what does Kirchhoff’s junction rule imply about the currents at a node?

  • A. Currents cancel out
  • B. Total current doubles
  • C. Currents are equal
  • D. Charge is conserved

Q2. What ensures that the total current entering a junction equals the total current leaving it in a complex circuit?

  • A. Voltage balance
  • B. Resistance equality
  • C. Field cancellation
  • D. Charge conservation

Q3. In a circuit with resistors in series, why does the current remain the same through each resistor?

  • A. Voltage is constant
  • B. Resistance cancels out
  • C. Electrons gain speed
  • D. Single path ensures charge continuity

Q4. A \( 10 \, \text{V} \) battery with \( 2 \, \Omega \) internal resistance delivers a current of \( 2 \, \text{A} \) to a resistor. What is the resistance of the resistor?

  • A. \( 2.5 \, \Omega \)
  • B. \( 2.8 \, \Omega \)
  • C. \( 3.0 \, \Omega \)
  • D. \( 3.5 \, \Omega \)

Q5. Two cells of emf \( 3 \, \text{V} \) and \( 7 \, \text{V} \) with internal resistances \( 0.5 \, \Omega \) and \( 1.5 \, \Omega \) are connected in series with a \( 10 \, \Omega \) resistor. What is the current through the circuit?

  • A. \( 0.83 \, \text{A} \)
  • B. \( 0.9 \, \text{A} \)
  • C. \( 1.0 \, \text{A} \)
  • D. \( 1.2 \, \text{A} \)

+ 5 more questions in the actual test

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