MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
When an object is picked up from the floor and placed on a table-
Think it through first, then pick an option.
- a work done > potential energy
- b work done = potential energy
- c work done < potential energy
- d work done ≠ mechanical energy
Answer and explanation
Correct answer: b work done = potential energy
The work done in lifting is stored as potential energy: W = Fh = mgh. So the work done equals the potential energy.
Why the other options are wrong
- a work done > potential energy: This is not the answer: The work done in lifting is stored as potential energy: W = Fh = mgh. So the work done equals the potential energy.
- c work done < potential energy: This is not the answer: The work done in lifting is stored as potential energy: W = Fh = mgh. So the work done equals the potential energy.
- d work done ≠ mechanical energy: This is not the answer: The work done in lifting is stored as potential energy: W = Fh = mgh. So the work done equals the potential energy.
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