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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Medium

A 15 V15 \, \text{V} battery with 1 Ω1 \, \Omega internal resistance delivers a current of 2.5 A2.5 \, \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.

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 15 V15 \, \text{V} battery with 1 Ω1 \, \Omega internal resistance delivers a current of 2.5 A2.5 \, \text{A} to a resistor. What is the resistance of the resistor?

  • A.

    4.0 Ω4.0 \, \Omega

  • B.

    4.5 Ω4.5 \, \Omega

  • C.

    5.0 Ω5.0 \, \Omega

  • D.

    5.5 Ω5.5 \, \Omega

Q2.

A copper wire carries 2.72 A2.72 \, \text{A} with a drift speed of 8×10−5 m/s8 \times 10^{-5} \, \text{m/s} . If n=8.5×1028 m−3n = 8.5 \times 10^{28} \, \text{m}^{-3} and e=1.6×10−19 Ce = 1.6 \times 10^{-19} \, \text{C}, what is the cross-sectional area?

  • A.

    2.2×10−5 m22.2 \times 10^{-5} \, \text{m}^2

  • B.

    2.4×10−5 m22.4 \times 10^{-5} \, \text{m}^2

  • C.

    2.45×10−5 m22.45 \times 10^{-5} \, \text{m}^2

  • D.

    2.5×10−5 m22.5 \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 m6 \, \text{m} and cross-sectional area 5×10−6 m25 \times 10^{-6} \, \text{m}^2 has a resistance of 12 Ω12 \, \Omega. What is the resistivity of the material?

  • A.

    1.0×10−5 Ωm1.0 \times 10^{-5} \, \Omega \text{m}

  • B.

    1.2×10−5 Ωm1.2 \times 10^{-5} \, \Omega \text{m}

  • C.

    1.5×10−5 Ωm1.5 \times 10^{-5} \, \Omega \text{m}

  • D.

    1.8×10−5 Ωm1.8 \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

+ 5 more questions in the actual test

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