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NEET & JEE · Physics · Class 11

Work Energy and Power — NEET 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 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 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.