Top Work, Energy, and Power Questions with Solutions for 2025
Work, Energy and Power forms a vital foundation in JEE Physics, testing your ability to analyze forces, motion, energy transfer, and power output. This chapter covers concepts like the work-energy theorem, conservation laws, types of energy, and practical applications in mechanics. Attempt this targeted mock test to strengthen your grasp of problem-solving techniques and boost your JEE Main 2025 readiness in this high-scoring chapter.
Mock Test Instructions for the Work Energy And Power Mock Test 1:
- 20 questions from Work Energy And Power Mock Test 1
- Time limit: 20 minutes
- Single correct answer per question
- Correct answers appear in bold green after submission
How Can JEE Mock Tests Help You Master Work, Energy and Power?
- Identify and fix misunderstandings in work-energy-power concepts by practicing JEE-level MCQs.
- Use timed mock tests to enhance problem-solving speed and exam temperament for Physics.
- Focus on applying work-energy theorem and differentiating between conservative and non-conservative forces.
- Review feedback to spot conceptual gaps in calculation of kinetic and potential energies.
- Master formula applications for power, energy conservation, and mechanical advantage under actual JEE time constraints.
Boost Your JEE Scores: Expert Mock Tests for Work, Energy and Power
- Solve mock tests designed by IITians to cover the toughest sub-topics and previous year JEE trends.
- Benchmark your chapter performance and track improvements across repeated attempts.
- Develop precision in using work-energy relations and power equations for numericals.
- Consolidate understanding through objective questions, reducing exam surprises.
- Gain exposure to scoring questions and important PYQ formats for Work, Energy, and Power.
Subject-Wise Excellence: JEE Main Mock Test Links
| S.No. | Subject-Specific JEE Main Online Mock Tests |
|---|---|
| 1 | Online FREE Mock Test for JEE Main Chemistry |
| 2 | Online FREE Mock Test for JEE Main Maths |
| 3 | Online FREE Mock Test for JEE Main Physics |
Important Study Materials Links for JEE Exams
FAQs on Work, Energy, and Power Mock Test 1 – 2025-26 Practice Questions
1. What is work in Physics?
Work in Physics is defined as the product of force and displacement in the direction of the force. It is calculated by the formula: Work (W) = Force (F) × Displacement (s) × cos(θ), where θ is the angle between force and displacement. The SI unit of work is joule (J).
2. Differentiate between kinetic energy and potential energy.
Kinetic energy is the energy possessed by a body due to its motion, given by KE = 0.5 × mass × velocity2. Potential energy is the energy stored in a body due to its position or configuration, commonly calculated as PE = mass × gravity × height for an object above the ground.
3. State the law of conservation of energy.
The law of conservation of energy states that energy can neither be created nor destroyed; it can only change from one form to another. The total energy of an isolated system remains constant.
4. What is power? Write its SI unit.
Power is the rate at which work is done or energy is transferred. It is calculated as Power (P) = Work (W) / Time (t). Its SI unit is the watt (W), where 1 watt = 1 joule/second.
5. What are some real-life examples of work, energy, and power?
Examples include:
• Pushing a cart across the floor (work)
• A moving car (kinetic energy)
• Water stored in a dam (potential energy)
• An electric bulb lighting up (power consumption)
6. How do you calculate the work done by a constant force acting at an angle to the displacement?
The work done (W) by a constant force (F) acting at an angle θ to the direction of displacement (s) is given by W = F × s × cos(θ), where θ is the angle between the force and the displacement vectors.
7. How is mechanical energy defined?
Mechanical energy is the sum of an object's kinetic energy and potential energy. It represents the total ability to do work due to its motion or position.
8. What is the relationship between work and energy?
Work and energy are closely related. Work done on an object results in a change in its energy. Positive work increases energy, while negative work decreases it.
9. Define the term 'power' and give a practical example from daily life.
Power is the rate of doing work or the rate at which energy is transferred or converted. For example, a 100-watt bulb uses more power and gives brighter light compared to a 40-watt bulb.
10. What are the different forms of energy?
Common forms of energy include:
• Kinetic Energy
• Potential Energy
• Thermal (Heat) Energy
• Chemical Energy
• Electrical Energy
• Nuclear Energy
11. How can you master the topic 'Work, Energy, and Power'?
To master work, energy, and power:
• Understand the basic definitions and formulas
• Practice numerical problems regularly
• Relate concepts to daily life examples
• Review solved examples and previous year questions
• Attempt mock tests and quizzes to check understanding
12. What is the work-energy theorem?
The work-energy theorem states that the net work done by all forces acting on a particle equals the change in its kinetic energy. Mathematically: Net Work = Final Kinetic Energy – Initial Kinetic Energy.
