Conservation of Energy MCQs – Class 11
Conservation of Energy MCQs – Class 11
Class: CBSE Class 11
Subject: Physics
Section: Work, Energy and Power
Topic: Conservation of Energy MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Subject: Physics
Section: Work, Energy and Power
Topic: Conservation of Energy MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Q1. Law of conservation of energy states:
Answer: C
Explanation: Total energy of an isolated system remains constant.
Explanation: Total energy of an isolated system remains constant.
Q2. In free fall, total mechanical energy:
Answer: C
Explanation: KE increases while PE decreases equally.
Explanation: KE increases while PE decreases equally.
Q3. At highest point of vertical throw:
Answer: B
Explanation: Velocity zero → KE zero → PE maximum.
Explanation: Velocity zero → KE zero → PE maximum.
Q4. Mechanical energy =
Answer: B
Explanation: Sum of kinetic and potential energies.
Explanation: Sum of kinetic and potential energies.
Q5. When a pendulum swings, energy converts between:
Answer: B
Explanation: Continuous KE ↔ PE exchange.
Explanation: Continuous KE ↔ PE exchange.
Q6. Energy loss in real pendulum due to:
Answer: Air resistance & friction.
Q7. Conservative force work depends on:
Answer: Initial & final position only.
Q8. Example of conservative force:
Answer: Gravitational force.
Q9. Work by conservative force in closed path:
Answer: Zero.
Q10. Roller coaster principle:
Answer: Conservation of mechanical energy.
Q11. At ground just before impact KE:
Answer: Maximum.
Q12. PE minimum at:
Answer: Lowest point.
Q13. Energy unit:
Answer: Joule.
Q14. Spring compression energy stored as:
Answer: Elastic PE.
Q15. Non-conservative force example:
Answer: Friction.
Q16. Mechanical energy conserved when:
Answer: Only conservative forces act.
Q17. Waterfall converts:
Answer: PE → KE.
Q18. Dam stores energy as:
Answer: Gravitational PE.
Q19. Battery converts:
Answer: Chemical → Electrical.
Q20. Sun energy source:
Answer: Nuclear fusion.
Q21. KE + PE constant ⇒
Answer: Mechanical energy conserved.
Q22. Energy lost due to friction becomes:
Answer: Heat energy.
Q23. Hydropower uses:
Answer: Conservation of energy.
Q24. Maximum PE at:
Answer: Maximum height.
Q25. KE depends on:
Answer: Velocity².
Q26. Energy cannot be:
Answer: Created or destroyed.
Q27. In ideal system total energy:
Answer: Constant.
Q28. Mechanical energy lost equals:
Answer: Work done by non-conservative forces.
Q29. Energy transformation example:
Answer: Electric fan (Electrical → Mechanical).
Q30. Total energy of universe:
Answer: Conserved.