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UPCET / UPSEE Current Electricity — practice questions — page 4

Explore 102 free Current Electricity questions in UPCET / UPSEE 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 91–102 of 102.

Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every statement true of drift velocityRead the answer and worked solution →Complete the temperature coefficient definitionRead the answer and worked solution →Flip and pair: symbol with quantityRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Property of the object or of the substance?Read the answer and worked solution →Order the chain: field to currentRead the answer and worked solution →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

Two are true, one is not

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Questions
  1. False statement
    emf is measured in newtons
    Statements
    1. emf is not a force
    2. emf is the work done per unit charge by the source
    3. emf is measured in newtons
  2. False statement
    Resistivity depends on the length of the sample
    Statements
    1. Resistivity depends on the length of the sample
    2. Resistivity is a property of the material
    3. Resistance depends on length and cross-section
  3. False statement
    The loop rule conserves current
    Statements
    1. The junction rule conserves charge
    2. The loop rule conserves current
    3. The loop rule sums potential changes to zero
The false line is always a property of one quantity attached to another. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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Three of these are wrong. Find the one that holds.

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Questions
  1. Question
    Three of these statements about emf are false.
    Choices
    1. Item
      It is work per unit charge
      Correct
      Yes
    2. Explanation
      Your syllabus says emf is NOT a force.
      Item
      It is a force measured in newtons
    3. Explanation
      Only in an OPEN circuit, with no current drawn.
      Item
      It equals terminal voltage under load
    4. Explanation
      emf belongs to the source, not the circuit.
      Item
      It depends on the external resistance
  2. Question
    Three of these statements about Ohm's law are false.
    Choices
    1. Item
      It is not a fundamental law of nature
      Correct
      Yes
    2. Explanation
      Rectifiers and GaAs do not.
      Item
      Every substance obeys it
    3. Explanation
      The chapter lists three failure modes.
      Item
      It cannot fail
    4. Explanation
      Resistivity comes from R = ρl/A, a separate relation.
      Item
      It defines resistivity
Each trap is a genuine misconception the chapter warns about. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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Tap every statement true of drift velocity

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Questions
  1. Items
    1. Text
      It is an average velocity of the carriers
      Matches the category
      Yes
    2. Text
      It is proportional to the applied field
      Matches the category
      Yes
    3. Text
      It arises because electrons collide with ions
      Matches the category
      Yes
    4. Text
      It equals the speed of light
      Matches the category
      No
    5. Text
      It grows without limit under a steady field
      Matches the category
      No
    Category
    True of drift velocity
The collision picture is what makes drift velocity, rather than acceleration, the right quantity. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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