Last Updated on June 5, 2025 by XAM CONTENT
Mastering the important concepts in Class 11 Physics Chapter 5 – Work, Energy, and Power is essential for scoring high marks in your exams. That’s why we’ve put together chapterwise multiple-choice questions (MCQs) with answers to help you revise effectively and boost your confidence. It is a part of MCQ Questions for CBSE Class 11 Physics Series.
These multiple-choice questions will help you assess your knowledge, improve accuracy, and boost confidence for your exams. Whether you are preparing for school tests, online tests or competitive exams, these Work, Energy, and Power MCQs will strengthen your conceptual clarity.
| Chapter | Work, Energy, and Power |
| Book | Physics for Class 11 |
| Type of Questions | MCQ Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 11 |
| Subject | Physics |
| Useful for | Class 11 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 11 Physics Chapterwise MCQ Questions |
MCQ Questions on Work, Energy, and Power Class 11 Physics (PDF Download)
MCQs
Q1. The work done by a person in lifting a box is maximum when:
(a) The box is pushed horizontally
(b) The box is lifted vertically upward
(c) The box is moved on a smooth surface
(d) No work is done
Show Answer
Answer: (b)
Explanation: Maximum work is done when force and displacement are in the same direction.
Q2. A force is said to be conservative if:
(a) It dissipates energy
(b) Work done depends only on initial and final positions
(c) Work done depends on the path
(d) It is variable only
Show Answer
Answer: (b)
Explanation: Conservative forces have path-independent work and can be associated with potential energy.
Q3. A ball is thrown upward. The mechanical energy at the highest point is:
(a) Zero
(b) Maximum kinetic energy
(c) Maximum potential energy
(d) Half of total energy
Show Answer
Answer: (c)
Explanation: At the highest point, kinetic energy is zero and potential energy is maximum.
Q4. The work done by friction over a closed path is:
(a) Always zero
(b) Always positive
(c) Always negative
(d) Non-zero and negative
Show Answer
Answer: (d)
Explanation: Friction is non-conservative and does negative work over a closed path.
Q5. The work-energy theorem is a scalar form of:
(a) Newton’s first law
(b) Newton’s second law
(c) Newton’s third law
(d) None of these
Show Answer
Answer: (b)
Explanation: It expresses the change in kinetic energy as the work done by net force, aligning with Newton’s second law.
Q6. If power P is supplied to a body and it moves with velocity v, then force is:
(a) P/v
(b) Pv
(c) v/P
(d) P²/v
Show Answer
Answer: (a)
Explanation: Power = Force × velocity, so Force = Power / velocity.
Q7. When is the kinetic energy of a spring-mass system maximum?
(a) At maximum displacement
(b) At equilibrium position
(c) At one-third of amplitude
(d) At turning points
Show Answer
Answer: (b)
Explanation: At equilibrium, potential energy is zero and kinetic energy is maximum.
Q8. The unit of work is:
(a) Watt
(b) Joule
(c) Newton
(d) Meter
Show Answer
Answer: (b)
Explanation: Joule is the SI unit of work.
Q9. Which of these quantities has the same unit as work?
(a) Acceleration
(b) Force
(c) Energy
(d) Velocity
Show Answer
Answer: (c)
Explanation: Work and energy are measured in joules (J).
Q10. Work done by gravity in vertical circular motion is:
(a) Always positive
(b) Always negative
(c) Depends on position
(d) Zero
Show Answer
Answer: (c)
Explanation: Work depends on height change, hence on position in the path.
Q11. A bullet loses 90% of its kinetic energy while passing through a wooden block. The ratio of its final to initial speed is:
(a) 1:10
(b) 1:3
(c) 1:√10
(d) 1:100
Show Answer
Answer: (c)
Explanation: KE ∝ v²; if KE becomes 0.1, v = √0.1 = 1/√10.
Q12. A conservative force has the property that:
(a) Work done is zero always
(b) Work done depends on path
(c) Work done in a closed path is zero
(d) None of the above
Show Answer
Answer: (c)
Explanation: Work done by a conservative force over a closed loop is always zero.
Q13. The dimensional formula of power is:
(a) [ML²T⁻²]
(b) [MLT⁻²]
(c) [ML²T⁻³]
(d) [M²LT⁻²]
Show Answer
Answer: (c)
Explanation: Power = Work / Time → [ML²T⁻²]/[T] = [ML²T⁻³].
Q14. In an inelastic collision:
(a) Only momentum is conserved
(b) Both momentum and kinetic energy are conserved
(c) Only energy is conserved
(d) None are conserved
Show Answer
Answer: (a)
Explanation: In inelastic collisions, momentum is conserved but kinetic energy is not.
Q15. A force F = kx acts on a particle. The potential energy is:
(a) kx
(b) kx²/2
(c) –kx²/2
(d) –kx
Show Answer
Answer: (c)
Explanation: For F = –dV/dx, integrate F = –kx → V = –∫F dx = kx²/2.
Q16. A car of mass m moving with velocity v stops in distance d. Work done by brakes is:
(a) mv²/2
(b) –mv²/2
(c) mgd
(d) –mgd
Show Answer
Answer: (b)
Explanation: Work done = change in KE = 0 – ½mv² = –½mv².
Q17. Which of these forces is non-conservative?
(a) Gravitational force
(b) Electrostatic force
(c) Spring force
(d) Friction
Show Answer
Answer: (d)
Explanation: Frictional force depends on path and converts mechanical energy to heat.
Q18. A spring is stretched by 10 cm by a force of 5 N. Its spring constant is:
(a) 0.5 N/m
(b) 50 N/m
(c) 5 N/m
(d) 500 N/m
Show Answer
Answer: (b)
Explanation: k = F/x = 5 / 0.1 = 50 N/m.
Q19. Power delivered by a force F acting on a body with velocity v is:
(a) F/v
(b) v/F
(c) F·v
(d) F × v
Show Answer
Answer: (c)
Explanation: Power = dot product of force and velocity, P = F·v.
Q20. A spring with k = 100 N/m is compressed by 4 cm. Its potential energy is:
(a) 0.08 J
(b) 0.08 N
(c) 8 J
(d) 0.8 J
Show Answer
Answer: (a)
Explanation: PE = ½kx² = ½×100×(0.04)² = 0.08 J.
We hope the given mcq questions with Answers for Work, Energy, and Power Class 11 helps you in your learning.
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Topics from which mcq questions may be asked
- Work-energy theorem
- Kinetic and potential energy
- Conservation of energy
Understanding energy and work helps explain how things move and function.
Frequently Asked Questions (FAQs) on Work, Energy, and Power MCQ Questions
Q1: What is the best way to prepare for Class 11 Physics MCQ questions?
A1: The best way is to study NCERT concepts thoroughly, practice topicwise MCQs regularly, and focus on understanding fundamental principles rather than rote learning. Solving previous year MCQs and mock tests can boost accuracy and speed.
Q2: Are NCERT questions enough for Class 11 Physics MCQ-based exams?
A2: NCERT forms the base for all CBSE Physics MCQs. However, for better preparation, students should solve additional MCQs from reference books and practice HOTS and competency-based questions to develop deeper conceptual clarity.
Q3: Where can I find chapterwise Class 11 Physics MCQ questions with answers?
A3: You can find chapterwise MCQ questions with answers and detailed explanations on trusted educational platforms like xamcontent.com and physicsgurukul.com. These cover both basic and advanced-level questions.
Q4: Do CBSE Class 11 exams include MCQs?
A4: Yes, as per the latest CBSE exam pattern, objective questions, including MCQs, are part of the final exam paper. MCQs test conceptual understanding and application skills.
Q5: How to score high in Class 11 Physics MCQs?
A5: To score high, understand the theory from NCERT, solve a variety of MCQs (basic, conceptual, numerical), and regularly revise formulas and diagrams. Avoid guesswork and focus on time management during tests.
Q6: What are competency-based MCQs in Class 11 Physics?
A6: Competency-based MCQs assess a student’s ability to apply concepts in real-life or unfamiliar scenarios. These questions go beyond textbook definitions and require logical reasoning and application of physics principles.
