Work, energy and power are fundamental concepts in Physics and frequently appear in the TNPSC General Science syllabus. This TNPSC Physics Work Energy Power Quiz contains important MCQ questions designed to help candidates practice topics such as work done by force, kinetic energy, potential energy and power. These questions are useful for aspirants preparing for TNPSC, SSC, RRB and other competitive exams. Attempt this quiz to test your understanding of work, energy and power and improve your exam preparation.
📘 Want to revise the concepts covered in this quiz?
Click on the Concept Booster tab above for detailed explanations.
TNPSC Physics Quiz 5 – Concept Booster
Understanding the concepts of work, energy and power is essential for solving Physics questions in competitive exams. This TNPSC Physics Work Energy Power Quiz covers fundamental ideas such as work done by force, different forms of energy, conservation of energy and power. These topics frequently appear in TNPSC, SSC, RRB and other government exams. Let us revise the key concepts related to work, energy and power.
Work
In physics, work is said to be done when a force applied on an object causes displacement in the direction of the force.
The formula for work is: Work = Force × Displacement
If a force acts on an object but there is no movement, then no work is done.
Example:
Pushing a wall does not produce displacement, so no work is done.
Energy
Energy is defined as the capacity to do work. Energy can neither be created nor destroyed; it can only be transformed from one form to another.
SI Unit of Energy
The SI unit of energy is Joule (J).
Energy exists in different forms such as:
- Light energy
- Mechanical energy
- Heat energy
- Electrical energy
- Chemical energy
Kinetic Energy
Kinetic energy is the energy possessed by an object due to its motion.
Formula: KE = ½ mv²
Where
m = mass of the object
v = velocity of the object
Example:
A moving car, a rolling ball or flowing water possesses kinetic energy.
The faster an object moves, the greater its kinetic energy.
Potential Energy
Potential energy is the energy possessed by an object due to its position or configuration.
Formula: PE = mgh
Where
m = mass
g = acceleration due to gravity
h = height
Example:
- Water stored in a dam
- A stretched rubber band
- A lifted object
These objects store energy due to their position or shape.
Mechanical Energy
Mechanical energy is the sum of kinetic energy and potential energy.
Mechanical Energy = Kinetic Energy + Potential Energy
This principle is important in understanding machines and energy transfer in physical systems.
Power
Power is defined as the rate at which work is done or energy is transferred.
Formula:
Power = Work / Time
SI Unit of Power
The SI unit of power is Watt (W).
1 Watt means 1 Joule of work done per second.
Large electrical devices are rated in kilowatts (kW).
Energy Consumption in Homes
Electric energy consumption in homes is measured in kilowatt-hour (kWh).
1 kWh is commonly referred to as one unit of electricity on electricity bills.
Law of Conservation of Energy
One of the most important principles in physics is the law of conservation of energy.
It states that:
Energy cannot be created or destroyed; it can only be converted from one form to another.
Example:
In a hydroelectric power plant, the potential energy of stored water is converted into kinetic energy and then into electrical energy.
Real-Life Examples
Hydroelectric Power Plant
Water stored in dams possesses potential energy. When released, it flows down and rotates turbines, converting potential energy into electrical energy.
Moving Vehicles
A moving car or train has kinetic energy because of its motion.
Stretched Rubber Band
When a rubber band is stretched, it stores elastic potential energy which is released when the band returns to its original shape.
Lifting Objects
When a person lifts an object from the ground, work is done against gravity and the object gains potential energy.
Final Revision Tips
Before attempting the TNPSC Physics Work Energy Power Quiz, remember these key points:
• Work is done when force causes displacement.
• The SI unit of work and energy is Joule (J).
• Energy is the capacity to do work.
• Kinetic energy depends on mass and velocity.
• Potential energy depends on height and mass.
• Mechanical energy is the sum of kinetic and potential energy.
• Power is the rate of doing work.
• SI unit of power is Watt (W).
• Electrical energy consumption is measured in kilowatt-hour (kWh).
• Energy cannot be created or destroyed; it only changes form.
Reviewing these concepts will help candidates solve work, energy and power questions in TNPSC and other competitive exams.estions related to reflection, refraction and optical phenomena in TNPSC and other competitive exams.
Recommended Reading
For deeper understanding of these concepts, refer to:
Next → TNPSC Physics Quiz 2 – Work, Energy and Power
Practice More TNPSC Physics Quizzes
- TNPSC Physics Quiz 1 – Laws of Motion
- TNPSC Physics Quiz 1 – Heat and Temperature
- TNPSC Physics Quiz 1 – Electricity and Magnetism
- TNPSC Physics Quiz 1 – Light and Reflection
Practice More TNPSC General Science Quizzes
- TNPSC Chemistry – Atoms and Molecules Quiz 1
- TNPSC Chemistry – Periodic Table Quiz 1
- TNPSC Chemistry – Acids, Bases and Salts Quiz 1
- TNPSC Chemistry – Chemical Reactions Quiz 1
- TNPSC Chemistry – Metals and Non-metals Quiz 1