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Current Electricity

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Mechanism of Flow of Current

Subtopic

Mechanism of Flow of Current under Current Electricity for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following physical quantities is a vector quantity in the study of current electricity?

    A.

    Electric Current

    B.

    Electrical Resistance

    C.

    Current Density

    D.

    Resistivity

  2. 2.

    The SI unit of mobility (μ\mu) of charge carriers is:

    A.

    m2⋅V−1⋅s−1m^2 \cdot V^{-1} \cdot s^{-1}

    B.

    m⋅V−2⋅s−1m \cdot V^{-2} \cdot s^{-1}

    C.

    kg⋅m⋅C−1kg \cdot m \cdot C^{-1}

    D.

    V⋅m⋅s−2V \cdot m \cdot s^{-2}

  3. 3.

    What happens to the relaxation time (τ\tau) of free electrons in a metallic conductor when its temperature is increased?

    A.

    It increases linearly

    B.

    It remains constant

    C.

    It decreases

    D.

    It first increases and then decreases

Download the worksheet for Current Electricity - Mechanism of Flow of Current to practice offline. It includes additional chapter-level practice questions.

Kirchhoff's Laws and Electrical Measurements

Subtopic

Kirchhoff's Laws and Electrical Measurements under Current Electricity for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    To increase the sensitivity of a potentiometer, which of the following modifications should be made?

    A.

    Increase the potential gradient along the wire

    B.

    Decrease the potential gradient by increasing the length of the wire

    C.

    Decrease the resistance in the primary circuit

    D.

    Increase the EMF of the driver cell

  2. 2.

    In a Meter Bridge experiment, the balance point is obtained at a length of 40 cm40 \text{ cm} from the left end. What is the ratio of the resistance in the left gap (RR) to the resistance in the right gap (SS)?

    A.

    3:2

    B.

    4:5

    C.

    2:3

    D.

    1:1

  3. 3.

    Kirchhoff's second law (Loop Rule), which states that the algebraic sum of changes in potential around any closed loop is zero, is a consequence of the conservation of:

    A.

    Charge

    B.

    Energy

    C.

    Magnetic flux

    D.

    Angular momentum

Download the worksheet for Current Electricity - Kirchhoff's Laws and Electrical Measurements to practice offline. It includes additional chapter-level practice questions.

Potentiometer and Wheatstone Bridge

Subtopic

Potentiometer and Wheatstone Bridge under Current Electricity for Grade 12 ICSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In the balanced Wheatstone bridge shown in the diagram, if P=5 ΩP = 5\ \Omega, Q=10 ΩQ = 10\ \Omega, and R=4 ΩR = 4\ \Omega, find the value of the unknown resistance SS.

    A.

    2 Ω2\ \Omega

    B.

    20 Ω20\ \Omega

    C.

    5 Ω5\ \Omega

    D.

    8 Ω8\ \Omega

  2. 2.

    In a standard metre bridge experiment, what is the total length of the wire used along the scale?

    A.

    100 cm100\text{ cm}

    B.

    50 cm50\text{ cm}

    C.

    200 cm200\text{ cm}

    D.

    10 cm10\text{ cm}

  3. 3.

    The wire of a potentiometer or a metre bridge is usually made of Manganin or Constantan because these materials possess:

    A.

    High melting point and high ductility.

    B.

    Low resistivity and high temperature coefficient of resistance.

    C.

    High resistivity and low temperature coefficient of resistance.

    D.

    Variable resistance that changes linearly with temperature.

Download the worksheet for Current Electricity - Potentiometer and Wheatstone Bridge to practice offline. It includes additional chapter-level practice questions.

Current Electricity - Class 12 Physics (ICSE) | Krit.club