Previous IIT / JEE Objective Questions
Work, Energy & Power – PAGE 5 (FINAL)
This final page is designed like an exam simulation. Questions are mixed in difficulty and concept. Attempt them with real exam discipline.
Q46. (IIT-JEE Advanced)
A particle slides from rest from height h on a frictionless track and then enters a rough horizontal surface. Which quantity determines the stopping distance?
Answer: Vertical height h
Reason:
Initial KE depends only on h.
Q47. (JEE Main)
A body is moving under gravity alone. Which quantity remains constant throughout the motion?
Answer: Total mechanical energy
Q48. (IIT-JEE Advanced)
A particle moves such that the net work done on it is zero. Which of the following is true?
Answer: Kinetic energy remains unchanged
Explanation:
Net work = ΔKE = 0
Q49. (IIT-JEE Advanced – Integer)
A block of mass 1 kg is dropped from height 20 m. Find its speed just before hitting ground (g = 10 m/s²).
Answer: 20 m/s
Method:
mgh = ½mv² → v = √(2gh)
Q50. (JEE Main)
A particle moves in a straight line under a force. If its kinetic energy is increasing, then:
Answer: Net work done is positive
Q51. (IIT-JEE Advanced)
A particle is at rest at a point where potential energy is minimum. Which statement is correct?
Answer: Stable equilibrium
Logic:
Small displacement increases potential energy.
Q52. (JEE Main)
Power delivered by a force is maximum when:
Answer: Force is parallel to velocity
Formula:
P = F·v
Q53. (IIT-JEE Advanced)
A body moves on a smooth circular track. What causes change in direction of velocity?
Answer: Normal reaction
Note:
Normal force does no work.
Q54. (JEE Main)
If kinetic energy of a body becomes zero, which statement is correct?
Answer: Body is momentarily at rest
Q55. (IIT-JEE Advanced)
A particle moves in a potential field. Turning points occur where:
Answer: Total energy equals potential energy
Final Exam Strategy (READ THIS)
- Scan all questions in first 5 minutes
- Solve sure-shot energy questions first
- Skip long algebra early
- Never guess under pressure
- Check units before final submission
If you can calmly solve Page–5, you are fully ready for IIT-level Work–Energy questions.
Work, Energy & Power – Complete Physics Library
This is the MASTER LIBRARY PAGE for the complete chapter Work, Energy and Power, prepared for Intermediate, IIT-JEE (Main & Advanced), NEET and competitive exams.
All concepts are explained from basic to IIT level, including theory, derivations, numerical problems, objective questions, previous year questions, tough IIT problems, tricks and cautions.
📚 Complete Lesson Index (Part 1 – Part 39)
- Part 1 – Introduction to Work
- Part 2 – Types of Work
- Part 3 – Variable Force & Graphs
- Part 4 – Kinetic Energy
- Part 5 – Work–Energy Theorem
- Part 6 – Potential Energy
- Part 7 – Conservative Forces
- Part 8 – Mechanical Energy
- Part 9 – Power
- Part 10 – Power Applications
- Part 11
- Part 12
- Part 13
- Part 14
- Part 15
- Part 16
- Part 17
- Part 18
- Part 19
- Part 20
- Part 21
- Part 22
- Part 23
- Part 24
- Part 25
- Part 26
- Part 27
- Part 28
- Part 29
- Part 30
- Part 31
- Part 32
- Part 33
- Part 34
- Part 35
- Part 36
- Part 37
- Part 38
- Part 39 – Final IIT Tough Problems & Solutions
Prepared by: Shaktimatha Learning 🌱
Strong Concepts • Smart Practice • Exam Success
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