4th Grade Science : Physical Science

Study concepts, example questions & explanations for 4th Grade Science

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Example Questions

Example Question #1 : Observe How Energy Is Transferred By Light

The bouncing of light off an object is called what?

Possible Answers:

Reflection

Infrared

Reversal

Refraction

Correct answer:

Reflection

Explanation:

Reflection is the term used to describe light bouncing off of an object. When the light touches an object that is smooth and shiny, it will reflect at the same angle at which it hit the surface of the object. Refraction describes the bending of a light ray when it enters a medium of a different speed. Infrared light refers to a type of light rather than the behavior of light.

Example Question #31 : Transfer Of Energy

Which of the following objects would better allow light to pass through?

Possible Answers:

Screen shot 2020 08 17 at 8.18.35 am

Screen shot 2020 08 17 at 8.18.23 am

Correct answer:

Screen shot 2020 08 17 at 8.18.35 am

Explanation:

The mason jars would better allow light to pass through because they are clear. The sample of fluorite would not allow light to pass through because it is opaque. Opaque objects reemit light waves from the surface back to our eyes rather than allowing it to pass through the object.

Example Question #1 : Observe How Energy Is Transferred By Light

This picture is an example of which term?

Possible Answers:

Reflection

Refraction

Revision

Absorption

Correct answer:

Refraction

Explanation:

This photo is an example of refraction. When light travels from water into the air, it changes direction because it slows down. Keep in mind that refraction is the bending of a light ray when it enters a medium of a different speed. Refraction occurring in water causes the object in the water to appear uneven or as if the portions in and out of the water are different in size.

Example Question #3 : Observe How Energy Is Transferred By Light

The light we see with our eyes is called _____________.

Possible Answers:

Ocular

Infrared light

Visible light

Sunlight

Correct answer:

Visible light

Explanation:

We can view light with our naked eyes on a spectrum. This spectrum is called visible light. Visible light rays reflect off of the object that you are viewing, so your brain can then process and understand what you are seeing.

Example Question #1 : Observe How Energy Is Transferred By Light

What is white light?

Possible Answers:

A shiny surface that reflects light

All pastel colors mixed together

All visible colors at equal intensity

Anything that makes light

Correct answer:

All visible colors at equal intensity

Explanation:

White light is colorless, ordinary daylight. It contains all of the wavelengths of visible light at an equal intensity at the same time, which creates beams of white light when focused on a single spot.

Example Question #1 : Convert Energy Forms

Alexis has to identify an invention in her home that converts one energy form into another. She has selected the lightbulb. The energy input into a light bulb is electrical. What type of energy is output from a lightbulb?

Possible Answers:

Light and motion

Sound and light

Heat and light

Heat and motion

Correct answer:

Heat and light

Explanation:

A lightbulb outputs heat and light after it has transformed the electrical energy it receives from the outlet or socket. Bulbs are one example of a household object that converts energy forms. An oven converts electrical energy into heat energy, a toaster concerts electrical into heat energy, and an alarm clock has an output of light and sound energy that is converted from electrical energy.

Example Question #231 : 4th Grade Science

Allison has to design a device that converts energy between two different forms. She decides she wants to convert electrical energy into motion and sound. Which invention should she model her design after?

Possible Answers:

A radio

The motor

A dog

An alarm clock

Correct answer:

The motor

Explanation:

The motor is an excellent invention for Allison to use as a model for her device. The engine is used to power machinery, vehicles, and even toys. The motor converts electrical energy into sound and motion, so the object it is powering can move. Allison can design an engine that uses alternative fuel, that produces more power, or motorized something no one has ever added the ability to.

Example Question #232 : 4th Grade Science

What is energy?

Possible Answers:

Move from one place to another

Having the potential to develop into something great in the future

A measure of the amount of matter inside an object

A measure of the capability to produce change

Correct answer:

A measure of the capability to produce change

Explanation:

Energy is the ability to do work or the ability to move an object. Energy cannot be made or destroyed; it can only be changed into different forms. Energy can be classified in two ways. First is potential energy, which is the amount of energy something has stored inside it. Next is kinetic energy. Kinetic energy is the energy of an object in motion. Anything that is moving has kinetic energy.

Example Question #2 : Convert Energy Forms

Mike designed a new firework for the holiday display. He spent weeks coming up with the perfect design to convert chemical energy into three forms of energy. Which three types of energy does a firework emit?

Possible Answers:

Light, chemical, and sound

Sound, light, and mechanical

Heat, light, and sound

Electric, sound, and heat

Correct answer:

Heat, light, and sound

Explanation:

Fireworks emit three types of energy. The first is sound energy, which is caused by the chemical explosion and can be heard as a loud boom. The fireworks are ignited by lighting the central fuse that burns when the fireworks rise into the sky. Burning these different materials produces light. The colors seen in the show are determined by the amount of energy in heating different chemicals and fuel. The explosion also produces heat or thermal energy.

Example Question #1 : Convert Energy Forms

Raena designed a new device that can convert energy forms. Her design can take electrical energy and turn it into thermal or heat energy. Which answer choice(s) are an example of this conversion?

Possible Answers:

A water source in the park "runs" water.

A gas oven bakes a pizza for dinner.

A space heater heats a room in your home.

A phone records a voicemail message.

Correct answer:

A space heater heats a room in your home.

Explanation:

Thermal energy is transferred to other objects causing them to heat up. A space heater is plugged into the wall, so it uses electrical power and converts it into heat energy to warm the room. The other response options have nothing to do with thermal energy and heating something.

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