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Work Energy and Power — NEET & JEE Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

For a constant force F and displacement d, how is work defined?
  1. F·d ✓
  2. |F×d|
  3. F/d
  4. Fd sinθ
Answer: A. Work is the scalar product F·d = Fd cosθ.
Why not B: The cross-product magnitude measures a turning tendency, not work.
Why not C: Force divided by displacement has the wrong dimensions for energy.
Why not D: The scalar product uses the component parallel to displacement, hence cosine.
A 10 N force moves a body 5 m at 60° to the force. What work is done?
  1. 50 J
  2. 43.3 J
  3. 25 J ✓
  4. 0 J
Answer: C. W=Fd cos60°=10×5×0.5=25 J.
Why not A: This uses Fd and treats the force as parallel to displacement.
Why not B: This uses sin60° instead of the parallel projection cos60°.
Why not D: Zero work would require a 90° angle.
For a mass on a string to just complete a vertical circle of radius R, what minimum speed is required at the top?
  1. √(gR) ✓
  2. √(2gR)
  3. √(3gR)
  4. √(5gR)
Answer: A. At the limiting top point tension is zero, so mv²/R=mg and v=√(gR).
Why not B: This uses an escape-like energy factor and ignores the zero-tension threshold.
Why not C: This transfers the top-to-side energy relation to the top condition.
Why not D: This is the corresponding minimum speed at the bottom.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Work Energy and Power →

Other NEET Physics chapters

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Questions

How many NEET and JEE questions are there on Work Energy and Power?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET and JEE Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.