NEET Physics: Current Electricity — MCQ Test 15

Q6. In a Wheatstone bridge with \( R_1 = 30 \, \Omega \), \( R_2 = 60 \, \Omega \), \( R_3 = 15 \, \Omega \), and \( R_4 = 32 \, \Omega \), a \( 10 \, \text{V} \) battery is connected across AC. What is the current through the galvanometer (\( R_g = 10 \, \Omega \))?

Q7. Two cells of emf \( 3 \, \text{V} \) and \( 5 \, \text{V} \) with internal resistances \( 1 \, \Omega \) and \( 3 \, \Omega \) are connected in series with a \( 4 \, \Omega \) resistor. What is the current through the circuit?

Q8. A nichrome wire has a resistance of \( 50 \, \Omega \) at \( 20^\circ \text{C} \) and \( \alpha = 1.7 \times 10^{-4} \, ^\circ\text{C}^{-1} \). What is its resistance at \( 380^\circ \text{C} \)?

Q9. A nichrome wire has a resistance of \( 80 \, \Omega \) at \( 25^\circ \text{C} \) and \( \alpha = 1.7 \times 10^{-4} \, ^\circ\text{C}^{-1} \). What is its resistance at \( 225^\circ \text{C} \)?

Q10. A battery of emf \( 12 \, \text{V} \) and internal resistance \( 1 \, \Omega \) is connected to a \( 5 \, \Omega \) resistor. What is the power dissipated in the external resistor?

NEET Physics — Current Electricity

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A 15 V15 \, \text{V} battery with 3 Ω3 \, \Omega internal resistance delivers a current of 2 A2 \, \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, Conductor, and Resistivity.

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 3 Ω3 \, \Omega internal resistance delivers a current of 2 A2 \, \text{A} to a resistor. What is the resistance of the resistor?

  • A.

    3.5 Ω3.5 \, \Omega

  • B.

    4.0 Ω4.0 \, \Omega

  • C.

    4.5 Ω4.5 \, \Omega

  • D.

    5.0 Ω5.0 \, \Omega

Q2.

A conductor has a resistivity of 1.0×10−7 Ωm1.0 \times 10^{-7} \, \Omega \text{m} and α=4×10−3 ∘C−1\alpha = 4 \times 10^{-3} \, ^\circ\text{C}^{-1} at 25∘C25^\circ \text{C}. What is its resistivity at 85∘C85^\circ \text{C}?

  • A.

    1.2×10−7 Ωm1.2 \times 10^{-7} \, \Omega \text{m}

  • B.

    1.22×10−7 Ωm1.22 \times 10^{-7} \, \Omega \text{m}

  • C.

    1.24×10−7 Ωm1.24 \times 10^{-7} \, \Omega \text{m}

  • D.

    1.3×10−7 Ωm1.3 \times 10^{-7} \, \Omega \text{m}

Q3.

A platinum wire has a resistance of 6 Ω6 \, \Omega at 0∘C0^\circ \text{C} and 6.48 Ω6.48 \, \Omega at 100∘C100^\circ \text{C}. What is the temperature coefficient of resistivity?

  • A.

    8.0×10−4 ∘C−18.0 \times 10^{-4} \, ^\circ\text{C}^{-1}

  • B.

    9.0×10−4 ∘C−19.0 \times 10^{-4} \, ^\circ\text{C}^{-1}

  • C.

    1.0×10−3 ∘C−11.0 \times 10^{-3} \, ^\circ\text{C}^{-1}

  • D.

    1.2×10−3 ∘C−11.2 \times 10^{-3} \, ^\circ\text{C}^{-1}

Q4.

A copper wire of cross-sectional area 3×10−7 m23 \times 10^{-7} \, \text{m}^2 carries a current of 0.9 A0.9 \, \text{A}. 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 drift speed?

  • A.

    2.0×10−4 m/s2.0 \times 10^{-4} \, \text{m/s}

  • B.

    2.21×10−4 m/s2.21 \times 10^{-4} \, \text{m/s}

  • C.

    2.4×10−4 m/s2.4 \times 10^{-4} \, \text{m/s}

  • D.

    2.6×10−4 m/s2.6 \times 10^{-4} \, \text{m/s}

Q5.

Two cells in parallel have emf 6 V6 \, \text{V} and 4 V4 \, \text{V} with internal resistances 2 Ω 2 \, \Omega and 1 Ω1 \, \Omega. What is the equivalent emf?

  • A.

    4.0 V4.0 \, \text{V}

  • B.

    4.67 V4.67 \, \text{V}

  • C.

    5.0 V5.0 \, \text{V}

  • D.

    5.33 V5.33 \, \text{V}

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