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COMEDK Current Electricity — practice questions — page 3

Explore 63 free Current Electricity questions in COMEDK Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Current Electricity questions and exercises with answers

Showing questions 61–63 of 63.

True or false: circuits and sourcesRead the answer and worked solution →Assertion and reason: circuitsRead the answer and worked solution →Tap every quantity the chapter treats as material-dependentRead the answer and worked solution →

Worked practice questions

True or false: circuits and sources

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Questions
  1. Statement is true
    Yes
    Statement
    A steady current requires a closed circuit.
  2. Statement is true
    Yes
    Statement
    The source moves charge from lower to higher potential energy.
  3. Statement is true
    No
    Statement
    A real source has zero internal resistance.
  4. Statement is true
    Yes
    Statement
    The external voltage is ε R ÷ (R + r).
  5. Statement is true
    No
    Statement
    Internal resistance can be ignored for accurate work.
How a real cell behaves in a circuit. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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Assertion and reason: circuits

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Questions
  1. Reason
    At the null point the four resistances satisfy a fixed ratio.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A Wheatstone bridge can measure an unknown resistance.
  2. Reason
    Charge cannot accumulate at a junction in a steady current.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Kirchhoff's junction rule follows from conservation of charge.
  3. Reason
    Kirchhoff's loop rule sums potential changes to zero.
    Verdict
    Both are true; the reason does not explain the assertion.
    Assertion
    Metals have low resistivity.
The last round pairs two true statements that do not explain one another. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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Tap every quantity the chapter treats as material-dependent

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Questions
  1. Items
    1. Text
      Resistivity
      Matches the category
      Yes
    2. Text
      Temperature coefficient of resistivity
      Matches the category
      Yes
    3. Text
      Number density of carriers
      Matches the category
      Yes
    4. Text
      Length of the wire
      Matches the category
      No
    5. Text
      Cross-sectional area
      Matches the category
      No
    Category
    Depends on the material itself
Separating what belongs to the substance from what belongs to the wiring. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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