Energy Quiz

While on a camping trip, Daniel noticed that he could see the campfire even from a distance. What form of energy is visible light?

Answer explanation

Visible light is a form of electromagnetic energy. It is part of the electromagnetic spectrum that can be seen by the human eye, allowing Daniel to see the campfire from a distance.

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Which situation best demonstrates the law of conservation of energy?

• ice water transforming into liquid water when it absorbs heat energy

• batteries being able to store potential energy over a long period of time

• a long distance runner conserving her energy to sprint at the end of the race

• the potential energy of a ball being dropped from a cliff being converted to kinetic energy

Answer explanation

The situation of a ball being dropped from a cliff illustrates the law of conservation of energy, as its potential energy is converted into kinetic energy during the fall, demonstrating energy transformation without loss.

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During a science class, Mia learned about a type of energy that involves breaking bonds in the nucleus of an atom. What type of energy is this?

Answer explanation

The type of energy that involves breaking bonds in the nucleus of an atom is called nuclear energy. This energy is released during nuclear reactions, such as fission or fusion.

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Charlotte and Nora are playing on a swing. As they swing back and forth, what type of energy in the system is equal to the sum of the system's kinetic and potential energies?

Answer explanation

The type of energy that is the sum of kinetic and potential energies in a system is called mechanical energy. As Charlotte and Nora swing, their mechanical energy remains constant, assuming no external forces act on them.

Anika and Elijah are observing a hydroelectric dam. They learn that moving water can be used to produce electrical energy because

• most forms of energy can be converted into other forms.

• energy cannot be converted into other forms.

• potential energy can only be converted into kinetic energy.

• kinetic energy can only be converted into potential energy.

Answer explanation

Moving water can produce electrical energy because most forms of energy can be converted into other forms. In this case, the kinetic energy of moving water is converted into electrical energy at the dam.

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Luna wants to use solar power to run her household appliances. Solar power changes the light from the Sun into a form of energy that can be used to heat homes and run household appliances. Which of the following forms of energy must solar energy be changed into in order to run household appliances?

• chemical

• electrical

• potential

• thermal

Answer explanation

Solar energy must be converted into electrical energy to power household appliances, as they typically operate on electricity. Other forms like chemical, potential, and thermal are not suitable for direct appliance use.

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Ethan is using his computer to play a video game. The computer can turn electrical energy into light and sound energy. Which other type of energy does Ethan's computer produce?

• A. thermal energy

• B. chemical energy

• C. magnetic energy

• D. gravitational energy

Answer explanation

Ethan's computer converts electrical energy into light and sound, but it also generates heat due to electrical resistance and component operation, which is thermal energy. Thus, the correct answer is A. thermal energy.

Scarlett is observing a solar panel system. Which statement is the best example of the law of conservation of energy?

• A. A train traveling down a hill loses potential energy that is then stored in the ground.

• B. An animal's energy is permanently stored in chemical bonds when it eats food.

• C. Chemical energy in a car engine is destroyed as it burns and releases exhaust into the air.

• D. Radiant energy from the Sun is not lost but transformed into other forms of energy.

Answer explanation

Choice D illustrates the law of conservation of energy, as it states that radiant energy from the Sun is transformed into other energy forms, rather than being lost, which aligns with the principle that energy cannot be created or destroyed.

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Priya is using a gas-powered lawnmower to cut the grass in her backyard. In this process, the gasoline is converted from chemical energy into which other type of energy?

• mechanical energy

• electrical energy

• nuclear energy

• light energy

Answer explanation

In a gas-powered lawnmower, gasoline's chemical energy is converted into mechanical energy, which powers the blades to cut the grass. Therefore, the correct answer is mechanical energy.

Hannah is working on a science project and needs a device that converts chemical energy to electric energy. What should she use?

• battery

• capacitor

• lightbulb

• resistor

Answer explanation

A battery is a device that converts chemical energy into electrical energy, making it the correct choice for Hannah's project. Capacitors store electrical energy, lightbulbs convert electrical energy to light, and resistors limit current.