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NEET UG Work, Energy and Power — practice questions — page 3

Explore 79 free Work, Energy and Power questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Work, Energy and Power questions and exercises with answers

Showing questions 61–79 of 79.

Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Tap every test for a conservative forceRead the answer and worked solution →Order the reasoning: from work to speedRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →True or false: energy bookkeepingRead the answer and worked solution →Speeds up, slows down, or neither?Read the answer and worked solution →Applying the work-energy theoremRead the answer and worked solution →True or false: potential energyRead the answer and worked solution →Kinetic or potential?Read the answer and worked solution →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

Assertion and reason

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Questions
  1. Reason
    The work it does depends on the path, and is not zero round a loop.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Friction is not a conservative force.
  2. Reason
    Gravity is conservative, and conservative forces admit such a function.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A potential energy can be defined for gravity.
  3. Reason
    Net work equals the change in kinetic energy.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A body's speed changes when net work is done on it.
  4. Reason
    Work is done whenever a force acts through a displacement.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    Every force is conservative.
The reason must genuinely explain the assertion. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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Two are true, one is not

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Questions
  1. False statement
    Friction's work is path-independent
    Statements
    1. Conservative work is path-independent
    2. Conservative work round a loop is zero
    3. Friction's work is path-independent
  2. False statement
    Potential energy suits friction
    Statements
    1. Potential energy suits friction
    2. Net work changes kinetic energy
    3. Potential energy suits conservative forces
  3. False statement
    A closed path always gives non-zero work
    Statements
    1. Work depends on force and displacement
    2. A closed path always gives non-zero work
    3. A closed path returns to the start
The false line grants a non-conservative force a conservative property. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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Tap every test for a conservative force

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Questions
  1. Items
    1. Text
      Work is independent of the path
      Matches the category
      Yes
    2. Text
      Work depends only on the end points
      Matches the category
      Yes
    3. Text
      Work is zero round any closed path
      Matches the category
      Yes
    4. Text
      Work is always positive
      Matches the category
      No
    5. Text
      Work grows with the length of the route
      Matches the category
      No
    Category
    A test for a CONSERVATIVE force
Two equivalent tests, given in the chapter. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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