Class 11 Physics — Chapter 6: Work, Energy and Power
66 practice questions · 22 Easy · 22 Medium · 22 Hard
Practise Class 11 Physics Chapter 6, "Work, Energy and Power", with 66 NCERT-aligned multiple-choice questions. The set is split into 22 Easy, 22 Medium and 22 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Work, Energy and Power" is one of the chapters where numerical problem-solving, derivations and conceptual application really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Work, Energy and Power, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 11 Physics mastery score. A few sample questions are shown below; sign in free to practise all 66.
Key concepts: Work, Energy and Power (Class 11 Physics)
This chapter covers work done by a force, kinetic and potential energy, the work–energy theorem, conservation of energy, power, and collisions.
- Work
- W = F·s = Fs cosθ; positive, negative or zero depending on the angle between force and displacement.
- Work–energy theorem
- The net work done on a body equals its change in kinetic energy: W_net = ΔKE.
- Potential energy & conservation
- For conservative forces, mechanical energy (KE + PE) is conserved.
- Power
- The rate of doing work: P = W/t = F·v; SI unit is the watt.
- Collisions
- Momentum is conserved in all collisions; kinetic energy is conserved only in elastic ones.
Key formulas — Work, Energy and Power
💡 Exam tips for Work, Energy and Power
- Use the work–energy theorem (W_net = ΔKE) to avoid solving the full equations of motion.
- In collisions momentum is always conserved; kinetic energy only in perfectly elastic collisions.
Sample questions
SI unit of work and energy:
1 J = 1 N·m.
SI unit of power:
Power = work/time.
Work-energy theorem: Net work =
W_net = ΔKE.
Work, Energy and Power — FAQs
What are the key concepts in Class 11 Physics Work, Energy and Power?+
This chapter covers work done by a force, kinetic and potential energy, the work–energy theorem, conservation of energy, power, and collisions. Key ideas include Work, Work–energy theorem, Potential energy & conservation, Power, Collisions.
What does Class 11 Physics Chapter 6 (Work, Energy and Power) cover on XamBaaz?+
It covers 66 NCERT-aligned MCQs on "Work, Energy and Power" — 22 Easy, 22 Medium and 22 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Work, Energy and Power" questions free to practise?+
Yes — sign in with Google to practise "Work, Energy and Power" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Work, Energy and Power" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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