NEET Physics: Current Electricity — MCQ Test 10

Q6. A wire has a resistance of \( 25 \, \Omega \) at \( 20^\circ \text{C} \) and \( 27.5 \, \Omega \) at \( 90^\circ \text{C} \). What is the temperature coefficient of resistivity?

Q7. Two cells in parallel have emf \( 12 \, \text{V} \) and \( 6 \, \text{V} \) with internal resistances \( 4 \, \Omega \) and \( 2 \, \Omega \). What is the equivalent emf?

Q8. A circuit has a \( 30 \, \text{V} \) battery with \( 3 \, \Omega \) internal resistance and three resistors \( 3 \, \Omega \), \( 6 \, \Omega \), \( 12 \, \Omega \) in parallel. What is the current through the \( 6 \, \Omega \) resistor?

Q9. A \( 12 \, \text{V} \) battery with \( 1 \, \Omega \) internal resistance delivers a current of \( 2 \, \text{A} \) to a resistor. What is the resistance of the resistor?

Q10. What happens to the total resistance of a circuit when an additional resistor is added in parallel to an existing resistor?

NEET Physics — Current Electricity

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A conductor has a resistivity of 6×10−8 Ωm6 \times 10^{-8} \, \Omega \text{m} and α=4×10−3 ∘C−1\alpha = 4 \times 10^{-3} \, ^\circ\text{C}^{-1} at 20∘C20^\circ \text{C}. What is its resistivity at 90∘C90^\circ \text{C}?

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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 Conductor, Resistivity, Sectional, Resistor, Dissipated, and Wheatstone.

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 conductor has a resistivity of 6×10−8 Ωm6 \times 10^{-8} \, \Omega \text{m} and α=4×10−3 ∘C−1\alpha = 4 \times 10^{-3} \, ^\circ\text{C}^{-1} at 20∘C20^\circ \text{C}. What is its resistivity at 90∘C90^\circ \text{C}?

  • A.

    7.2×10−8 Ωm7.2 \times 10^{-8} \, \Omega \text{m}

  • B.

    7.5×10−8 Ωm7.5 \times 10^{-8} \, \Omega \text{m}

  • C.

    7.68×10−8 Ωm7.68 \times 10^{-8} \, \Omega \text{m}

  • D.

    8.0×10−8 Ωm8.0 \times 10^{-8} \, \Omega \text{m}

Q2.

A copper wire carries 3.4 A3.4 \, \text{A} with a drift speed of 1.25×10−4 m/s1.25 \times 10^{-4} \, \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.

    1.8×10−5 m21.8 \times 10^{-5} \, \text{m}^2

  • B.

    1.9×10−5 m21.9 \times 10^{-5} \, \text{m}^2

  • C.

    1.95×10−5 m21.95 \times 10^{-5} \, \text{m}^2

  • D.

    2.0×10−5 m22.0 \times 10^{-5} \, \text{m}^2

Q3.

A 5 Ω5 \, \Omega resistor carries a current of 4 A4 \, \text{A} for 15 s15 \, \text{s}. What is the energy dissipated?

  • A.

    1000 J1000 \, \text{J}

  • B.

    1100 J1100 \, \text{J}

  • C.

    1150 J1150 \, \text{J}

  • D.

    1200 J1200 \, \text{J}

Q4.

A Wheatstone bridge has R1=30 ΩR_1 = 30 \, \Omega, R2=60 ΩR_2 = 60 \, \Omega, R3=25 ΩR_3 = 25 \, \Omega. What is R4R_4 for balance?

  • A.

    45 Ω45 \, \Omega

  • B.

    50 Ω50 \, \Omega

  • C.

    55 Ω55 \, \Omega

  • D.

    60 Ω60 \, \Omega

Q5.

A circuit has a 6 V6 \, \text{V} battery with 1 Ω1 \, \Omega internal resistance and two resistors 2 Ω2 \, \Omega and 3 Ω3 \, \Omega in parallel. What is the total current?

  • A.

    2.0 A2.0 \, \text{A}

  • B.

    2.5 A2.5 \, \text{A}

  • C.

    2.73 A2.73 \, \text{A}

  • D.

    3.0 A3.0 \, \text{A}

+ 5 more questions in the actual test

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