Conservation of energy
Science

In this article we will study about Conservation of Energy and solved MCQ related to this topic.

What Is the Conservation of Energy?

Imagine you have a bouncing ball. When you throw the ball, it bounces back. Do you know from where  it gets the energy to bounce back? That’s where the law of conservation of energy comes into play.

The conservation of energy says that energy cannot be created or destroyed, only changed from one form to another. In other words, the total amount of energy in a system remains constant.

Different Forms of Energy

Energy can take several forms:

  1. Kinetic Energy: This is the energy of moving objects. When you throw the ball, it has kinetic energy because it’s moving.
  2. Potential Energy: When you hold the ball up high, it has potential energy. It has the “potential” to move, thanks to gravity pulling it down.
  3. Thermal Energy: This is the energy of heat. When you rub your hands together, you’re creating thermal energy.
  4. Chemical Energy: Found in the food you eat, chemical energy is released when your body breaks down the food to keep you going.

How Does Energy Change?

Back to the bouncing ball. When you throw the ball down, the potential energy changes to kinetic energy as it moves. When it bounces back, some of the kinetic energy changes back to potential energy. The energy keeps changing forms, but the total amount stays the same.

Real-World Examples

  1. Hydroelectric Dams: Water stored in a dam has potential energy. When it flows through turbines, it turns into kinetic energy to generate electricity.
  2. Eating Food: The food you eat contains chemical energy. Your body turns this into kinetic energy to move and thermal energy to keep warm.

Why Is This Important?

Understanding the conservation of energy helps us see how energy moves and changes around us. It helps engineers design machines, architects build energy-efficient buildings, and scientists explore the universe.

MCQs on Conservation Of Energy :-

  • What does the law of conservation of energy state?
  • a) Energy can be created
  • b) Energy can be destroyed
  • c) Energy cannot be created or destroyed
  • d) Energy can be created and destroyed
  • Answer: c

 

  • Kinetic energy is the energy of:
  • a) Heat
  • b) Movement
  • c) Height
  • d) Chemical reactions
  • Answer: b

 

  • Potential energy depends on:
  • a) Speed
  • b) Heat
  • c) Position
  • d) Friction
  • Answer: c

 

  • A ball at the top of a hill has which type of energy?
  • a) Kinetic
  • b) Thermal
  • c) Potential
  • d) Chemical
  • Answer: c

 

  • In a closed system, the total amount of energy:
  • a) Increases
  • b) Decreases
  • c) Remains the same
  • d) Fluctuates randomly
  • Answer: c

 

  • What form of energy is stored in food?
  • a) Kinetic
  • b) Potential
  • c) Chemical
  • d) Thermal
  • Answer: c

 

  • A moving car has:
  • a) Chemical energy
  • b) Potential energy
  • c) Kinetic energy
  • d) Thermal energy
  • Answer: c

 

  • When you eat food and move, you are converting:
  • a) Chemical energy to kinetic energy
  • b) Kinetic energy to potential energy
  • c) Potential energy to thermal energy
  • d) Thermal energy to kinetic energy
  • Answer: a

 

  • What form of energy does a battery store?
  • a) Thermal energy
  • b) Kinetic energy
  • c) Potential energy
  • d) Chemical energy
  • Answer: d

 

  • In a hydroelectric dam, water’s potential energy is converted into:
  • a) Chemical energy
  • b) Thermal energy
  • c) Kinetic energy
  • d) Electrical energy
  • Answer: d

 

 

  • When ice melts into water, what type of energy is involved?
  • a) Kinetic energy
  • b) Chemical energy
  • c) Potential energy
  • d) Thermal energy
  • Answer: d

 

  • If a book is moved from a lower shelf to a higher shelf, its potential energy will:
  • a) Increase
  • b) Decrease
  • c) Remain the same
  • d) Turn into kinetic energy
  • Answer: a

 

  • A roller coaster at the top of a hill has:
  • a) More potential energy and less kinetic energy
  • b) More kinetic energy and less potential energy
  • c) Equal potential and kinetic energy
  • d) No potential or kinetic energy
  • Answer: a

 

  • A swinging pendulum converts potential energy into:
  • a) Chemical energy
  • b) Thermal energy
  • c) Kinetic energy
  • d) Electrical energy
  • Answer: c

 

  • When you burn wood in a fireplace, which energy transformation occurs?
  • a) Chemical to thermal
  • b) Thermal to kinetic
  • c) Potential to kinetic
  • d) Kinetic to potential
  • Answer: a

 

  • What type of energy is stored in gasoline?
  • a) Electrical energy
  • b) Thermal energy
  • c) Chemical energy
  • d) Kinetic energy
  • Answer: c

 

  • A fan converts electrical energy into:
  • a) Chemical energy
  • b) Potential energy
  • c) Kinetic energy
  • d) Heat energy
  • Answer: c

 

  • During photosynthesis, plants convert sunlight into:
  • a) Kinetic energy
  • b) Thermal energy
  • c) Chemical energy
  • d) Potential energy
  • Answer: c

 

  • When you wind a spring toy, you increase its:
  • a) Kinetic energy
  • b) Chemical energy
  • c) Potential energy
  • d) Electrical energy
  • Answer: c

 

  • Energy stored due to an object’s position or arrangement is called:
  • a) Kinetic energy
  • b) Chemical energy
  • c) Potential energy
  • d) Thermal energy
  • Answer: c

 

  • A light bulb converts electrical energy mainly into:
  • a) Potential energy
  • b) Kinetic energy
  • c) Chemical energy
  • d) Light and thermal energy
  • Answer: d

 

  • A stretched rubber band holds:
  • a) Kinetic energy
  • b) Thermal energy
  • c) Potential energy
  • d) Chemical energy
  • Answer: c

 

  • The law of conservation of energy applies to:
  • a) Only mechanical systems
  • b) Only electrical systems
  • c) Only thermal systems
  • d) All systems
  • Answer: d

 

  • When a car’s speed doubles, its kinetic energy:
  • a) Remains the same
  • b) Doubles
  • c) Quadruples
  • d) Is halved
  • Answer: c

 

  • What type of energy is possessed by a compressed spring?
  • a) Chemical energy
  • b) Thermal energy
  • c) Kinetic energy
  • d) Potential energy
  • Answer: d

 

  • When you turn on a radio, electrical energy is converted into:
  • a) Light energy
  • b) Sound energy
  • c) Potential energy
  • d) Chemical energy
  • Answer: b

 

  • In a waterfall, the water at the top has:
  • a) More kinetic energy
  • b) More potential energy
  • c) No energy
  • d) Equal potential and kinetic energy
  • Answer: b

 

  • When you strike a match, which type of energy transformation occurs?
  • a) Kinetic to potential
  • b) Thermal to light
  • c) Chemical to thermal and light
  • d) Electrical to thermal
  • Answer: c

 

  • A battery-operated toy car mainly converts chemical energy into:
  • a) Thermal energy
  • b) Potential energy
  • c) Kinetic energy
  • d) Light energy
  • Answer: c

 

  • A person eating an apple and using energy to walk is an example of:
  • a) Potential to kinetic energy
  • b) Kinetic to potential energy
  • c) Chemical to kinetic energy
  • d) Thermal to kinetic energy
  • Answer: c

 

  • Solar panels convert what type of energy into electrical energy?
  • a) Kinetic energy
  • b) Chemical energy
  • c) Thermal energy
  • d) Solar energy
  • Answer: d

 

  • A person lifting a box is an example of converting:
  • a) Chemical to potential energy
  • b) Potential to kinetic energy
  • c) Thermal to chemical energy
  • d) Kinetic to thermal energy
  • Answer: a

 

  • When you lift a suitcase, you increase its:
  • a) Kinetic energy
  • b) Thermal energy
  • c) Potential energy
  • d) Chemical energy
  • Answer: c

 

  • Solar panels convert sunlight directly into:
  • a) Thermal energy
  • b) Chemical energy
  • c) Electrical energy
  • d) Potential energy
  • Answer: c

 

  • What happens to kinetic energy if the mass of an object is doubled while its speed remains constant?
  • a) It remains the same
  • b) It doubles
  • c) It quadruples
  • d) It is halved
  • Answer: b

 

  • Energy that is stored within atomic nuclei is called:
  • a) Kinetic energy
  • b) Nuclear energy
  • c) Chemical energy
  • d) Thermal energy
  • Answer: b

 

  • A car engine converts chemical energy from fuel into:
  • a) Light energy
  • b) Sound energy
  • c) Kinetic and thermal energy
  • d) Potential energy
  • Answer: c

 

  • A cyclist at rest at the top of a hill has:
  • a) More potential than kinetic energy
  • b) More kinetic than potential energy
  • c) No kinetic or potential energy
  • d) Equal kinetic and potential energy
  • Answer: a

 

  • When you eat a candy bar, the energy stored inside is mainly:
  • a) Light energy
  • b) Sound energy
  • c) Thermal energy
  • d) Chemical energy
  • Answer: d

 

  • A refrigerator primarily converts electrical energy into:
  • a) Kinetic and potential energy
  • b) Chemical and thermal energy
  • c) Thermal and mechanical energy
  • d) Light and sound energy
  • Answer: c

 

  • Which form of energy is responsible for our sense of warmth from the Sun?
  • a) Chemical energy
  • b) Sound energy
  • c) Light energy
  • d) Thermal energy
  • Answer: d

These questions are created to help students understand the different types of energy transformations in everyday scenarios. They cover the foundational knowledge of the conservation of energy, its application, and its significance.

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