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CBSE Class 9 Work and Energy — practice questions — page 2

Explore 63 free Work and Energy questions in CBSE Class 9 Science. Open each question or exercise to read its content, reference answers and available explanation.

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Work and Energy questions and exercises with answers

Showing questions 31–60 of 63.

Order the steps to compute kinetic energy of a moving bodyRead the answer and worked solution →The SI unit of work is the:Read the answer and worked solution →The SI unit of energy is the:Read the answer and worked solution →Energy possessed by a moving object is called:Read the answer and worked solution →Energy stored because of position is called:Read the answer and worked solution →If the force on an object is zero, the work done is:Read the answer and worked solution →Power is the rate of doing:Read the answer and worked solution →The SI unit of power is the:Read the answer and worked solution →One watt equals one joule per:Read the answer and worked solution →Work done by a force perpendicular to the motion is:Read the answer and worked solution →When positive work is done on an object, it:Read the answer and worked solution →If negative work is done, the kinetic energy:Read the answer and worked solution →An object at rest has kinetic energy equal to:Read the answer and worked solution →If the speed of a vehicle doubles, its kinetic energy becomes:Read the answer and worked solution →Mechanical advantage is the ratio of load to:Read the answer and worked solution →The mechanical advantage of a fixed pulley is:Read the answer and worked solution →A fixed pulley mainly changes the effort's:Read the answer and worked solution →A longer, shallower inclined plane gives a mechanical advantage that is:Read the answer and worked solution →The fixed point about which a lever rotates is the:Read the answer and worked solution →In a lever, the end that applies the larger force moves:Read the answer and worked solution →Runaway truck ramps on highways work as:Read the answer and worked solution →Match the quantity to its unitRead the answer and worked solution →Kinetic or potential?Read the answer and worked solution →Sort the simple machinesRead the answer and worked solution →True or false about work and energyRead the answer and worked solution →Work and energy numbersRead the answer and worked solution →Complete the energy ruleRead the answer and worked solution →Pick the right unitRead the answer and worked solution →Work and energy bingoRead the answer and worked solution →Match each mechanical energy form with its algebraic formula:Read the answer and worked solution →

Worked practice questions

Order the steps to compute kinetic energy of a moving body

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Steps
  1. Measure the mass m of the body in kg
  2. Measure the velocity v in m/s
  3. Square the velocity: v²
  4. Multiply by mass: m·v²
  5. Halve the result: KE = ½·m·v² (in Joules)

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The SI unit of work is the:

  1. Joule
  2. Newton
  3. Pascal
  4. Ampere
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Correct answer: A. Joule

1. Work is done when a force moves an object. 2. Its unit is named after a British scientist. 3. The SI unit of work is the joule. 4. So the answer is the joule. _Source: syllabus Science, Ch 7 'Work, Energy, and Simple Machines'_

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The SI unit of energy is the:

  1. Ampere
  2. Joule
  3. Newton
  4. Pascal
Show answer and solution

Correct answer: B. Joule

1. Work and energy are measured in the same unit. 2. Work is measured in joules. 3. So the SI unit of energy is also the joule. 4. The answer is the joule. _Source: syllabus Science, Ch 7 'Work, Energy, and Simple Machines'_

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