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NEET UG Current Electricity — practice questions — page 4

Explore 163 free Current Electricity questions in NEET UG 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 91–120 of 163.

Charge carriersRead the answer and worked solution →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 →An electric current is constituted by:Read the answer and worked solution →Materials that carry current when a field is applied are:Read the answer and worked solution →Ohm's law states that V is proportional to:Read the answer and worked solution →Doubling the length of a conductor makes its resistance:Read the answer and worked solution →Halving the cross-section area of a conductor makes resistance:Read the answer and worked solution →The resistance inside a cell itself is called its:Read the answer and worked solution →Resistance is inversely proportional to the conductor's:Read the answer and worked solution →The average time between electron collisions is called:Read the answer and worked solution →The drift velocity of electrons points:Read the answer and worked solution →Drift velocity is small compared with the electrons':Read the answer and worked solution →Internal resistance of a cell may be neglected when it is:Read the answer and worked solution →Compared with electrolytic cells, dry cells have internal resistance that is:Read the answer and worked solution →Two cells joined can be replaced by one cell of equivalent:Read the answer and worked solution →How many rules did Kirchhoff give for circuit analysis?Read the answer and worked solution →Kirchhoff's junction rule for currents I1, I2 into a junction gives:Read the answer and worked solution →The quantity denoted by sigma, the inverse of resistivity, is:Read the answer and worked solution →Resistance depends on the material and on the conductor's:Read the answer and worked solution →

Worked practice questions

Charge carriers

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Questions
  1. Question
    In most substances the carriers of current are
    Choices
    1. protons
    2. electrons
    3. neutrons
    Correct choice
    electrons
  2. Question
    In electrolytic liquids the carriers are
    Choices
    1. electrons only
    2. neutrons
    3. positive and negative ions
    Correct choice
    positive and negative ions
  3. Question
    Current is defined as
    Choices
    1. net charge passing per unit time through an area
    2. charge per unit volume
    3. force per unit charge
    Correct choice
    net charge passing per unit time through an area
  4. Question
    For electrons the charge q equals
    Choices
    1. +e
    2. −e
    3. 0
    Correct choice
    −e
Electrons carry the current in most substances, but not all. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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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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