NEET Physics: Current Electricity — MCQ Test 4

Q6. A Wheatstone bridge with \( R_1 = 4 \, \Omega \), \( R_2 = 8 \, \Omega \), \( R_3 = 6 \, \Omega \), \( R_4 = 12 \, \Omega \) has a \( 12 \, \text{V} \) battery across AC and a galvanometer (\( 2 \, \Omega \)) across BD. What is the current through the galvanometer?

Q7. A Wheatstone bridge with \( R_1 = 16 \, \Omega \), \( R_2 = 32 \, \Omega \), \( R_3 = 24 \, \Omega \), \( R_4 = 48 \, \Omega \) has a \( 20 \, \text{V} \) battery across AC and a galvanometer (\( 5 \, \Omega \)) across BD. What is the current through the galvanometer?

Q8. A circuit has a \( 12 \, \text{V} \) battery with \( 1 \, \Omega \) internal resistance and two resistors \( 2 \, \Omega \) and \( 6 \, \Omega \) in parallel. What is the total current?

Q9. A \( 18 \, \text{V} \) battery with negligible internal resistance is connected to a cubical network of 12 resistors, each \( 3 \, \Omega \). What is the total current?

Q10. A cell of emf \( 5 \, \text{V} \) and internal resistance \( 0.5 \, \Omega \) is connected to a \( 4.5 \, \Omega \) resistor. What is the current in the circuit?

NEET Physics — Current Electricity

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Why does a non-ohmic device, like a diode, exhibit a non-linear current-voltage relationship?

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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 Relationship, Wheatstone, Galvanometer, Resistor, Dissipates, and Resistance.

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. Why does a non-ohmic device, like a diode, exhibit a non-linear current-voltage relationship?

  • A. Temperature fluctuates
  • B. Resistance varies with voltage
  • C. Current is constant
  • D. Conductor length changes

Q2. A Wheatstone bridge with \( R_1 = 10 \, \Omega \), \( R_2 = 20 \, \Omega \), \( R_3 = 15 \, \Omega \), \( R_4 = 30 \, \Omega \) has a \( 15 \, \text{V} \) battery across AC and a galvanometer (\( 10 \, \Omega \)) across BD. What is the current through the galvanometer?

  • A. \( 0.05 \, \text{A} \)
  • B. \( 0.02 \, \text{A} \)
  • C. \( 0.01 \, \text{A} \)
  • D. \( 0 \, \text{A} \)

Q3. A \( 12 \, \Omega \) resistor dissipates \( 48 \, \text{W} \) of power. What is the voltage across it?

  • A. \( 24 \, \text{V} \)
  • B. \( 26 \, \text{V} \)
  • C. \( 28 \, \text{V} \)
  • D. \( 30 \, \text{V} \)

Q4. A wire has a resistance of \( 12 \, \Omega \) at \( 25^\circ \text{C} \) and \( 13.2 \, \Omega \) at \( 85^\circ \text{C} \). 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. Why does the drift velocity of electrons in a conductor remain much smaller than their thermal velocity?

  • A. Electric field cancels thermal motion
  • B. Electrons lose charge
  • C. Resistance stops motion
  • D. Frequent collisions limit net motion

+ 5 more questions in the actual test

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