4th Grade Science : 4th Grade Science
Study concepts, example questions & explanations for 4th Grade Science
All 4th Grade Science Resources
Example Questions
Example Question #1 : Convert Energy Forms
Marge wants to develop a device to convert energy forms and wants it to have little to no negative impact on the environment. Which type of energy should she use as her primary power source to accomplish this?
Hydropower
All of the answer choices are correct.
None of the answer choices are correct.
Solar
Wind
All of the answer choices are correct.
Many companies and even home inventors are turning to renewable resources to power their creations. Renewable resources have less of a negative impact on the planet when compared to traditional fossil fuels such as oil and coal. Solar power, wind energy, and hydropower are all examples of clean energy sources that Marge could use for her device.
Example Question #1 : Convert Energy Forms
True or False: One form of energy can transform (convert) into another.
False
True
True
The statement in the question is correct. Energy is transformed (converted) all of the time, and often we don't even realize it. Many objects in our home are plugged into electrical outlets and draw on electricity provided by a power plant; they then transform this electrical energy into something useful to meet our needs. Often we use batteries to power objects; this is a conversion of chemical energy. A few examples you may have in your home include a toaster converting electrical energy into thermal and mechanical energy or a battery-powered flashlight converting chemical energy into light energy. You can search around your home and find lots of instances of energy transformation!
Example Question #1 : Convert Energy Forms
True or False: When designing a device to convert energy it must use electricity to work.
True
False
False
The statement in the question is incorrect. Energy is transformed (converted) all of the time, and often we don't even realize it. Many objects in our home are plugged into electrical outlets and draw on electricity provided by a power plant; they then transform this electrical energy into something useful to meet our needs. But there are other types of energy transformation as well. Often we use batteries to power objects; this is a conversion of chemical energy. We apply heat to something like fireworks, and a chemical reaction occurs, transforming the powder inside into a flying display of beautiful colors and loud noises. Many homes use solar energy to power their devices and appliances within. Electricity is a popular choice for an energy source, but it is not the only option we have.
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