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WBJEE Work and Power — practice questions — page 4

Explore 98 free Work and Power questions in WBJEE Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Work and Power questions and exercises with answers

Showing questions 91–98 of 98.

Tap every statement true of a closed pathRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: energyRead the answer and worked solution →Complete the potential energy relationRead the answer and worked solution →Flip and pair: quantity with what it tracksRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Order the reasoning: why a pendulum keeps swingingRead the answer and worked solution →Conservative or not, in practiceRead the answer and worked solution →

Worked practice questions

Tap every statement true of a closed path

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Questions
  1. Items
    1. Text
      It returns to the starting point
      Matches the category
      Yes
    2. Text
      A conservative force does zero work over it
      Matches the category
      Yes
    3. Text
      Friction does non-zero work over it
      Matches the category
      Yes
    4. Text
      It must be a straight line
      Matches the category
      No
    5. Text
      It always ends somewhere new
      Matches the category
      No
    Category
    True of a CLOSED path
Returning to the start is what makes the test work. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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Spot the one that does not belong

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Questions
  1. Items
    1. Gravity
    2. Air resistance
    3. Spring force
    Odd item
    Air resistance
  2. Items
    1. Path-independent
    2. Zero over a loop
    3. Route-dependent
    Odd item
    Route-dependent
  3. Items
    1. Displacement
    2. Kinetic energy
    3. Potential energy
    Odd item
    Displacement
One item is not conservative. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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Assertion and reason: energy

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Questions
  1. Reason
    Net work equals the change in kinetic energy, which is zero here.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A body moving at constant speed has zero net work done on it.
  2. Reason
    Potential energy requires a conservative force, and friction is not one.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Friction has no potential energy function.
  3. Reason
    Conservative forces do path-independent work.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    Potential energy depends on the path taken.
The reason must genuinely explain the assertion. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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