Light And Sound 3rd Grade Science Quiz

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| By Lauraflack

Lauraflack

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1/10 Questions

How is a shadow formed?
- Turning off a light
- Blocking the path of light
- Shining light on a dark area
- Vibrations

About This Quiz

Welcome to this "Light and sound 3rd-grade science quiz". Sound is a mechanical wave, whereas light is an electromagnetic one. Light does not need a medium to travel to. Sound does, but they are both waves, but only light is also a particle. Test out what you know about these two, their use, and their effects by attempting the simple See moreand comprehensive quiz below. All the best to you with this wonderful quiz, and have fun!

Light And Sound 3rd Grade Science Quiz - Quiz

Questions and Answers

2.

Most light energy on Earth comes from
- The moon
- Street lights
- Candles
- The sun
Correct Answer

A. The sun

Explanation

The sun is the primary source of light energy on Earth. It emits electromagnetic radiation, including visible light, which reaches our planet and provides illumination. The moon reflects some of this sunlight back to Earth, but it is not a significant source of light energy. Street lights and candles are artificial sources of light that rely on electricity or combustion, but they do not account for the majority of light energy on Earth. Therefore, the correct answer is the sun.

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16
3.

Sunlight energy can heat up everything EXCEPT:
- Sand
- Water
- Cement
- An indoor t.v.
Correct Answer

A. An indoor t.v.

Explanation

Sunlight energy can heat up objects that are directly exposed to it, such as sand, water, and cement. However, an indoor TV is not directly exposed to sunlight, as it is typically located inside a building, shielded from direct sunlight. Therefore, sunlight cannot heat up an indoor TV.

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16
4.

A light year is known as the distance that the light covers in a year.
- True
- False
Correct Answer

A. True

Explanation

A light year is a unit of measurement used in astronomy to represent the distance that light travels in one year. Since light travels at a constant speed, this distance is approximately 9.46 trillion kilometers or 5.88 trillion miles. Therefore, the statement that a light year is the distance that light covers in a year is true.

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7
5.

When light is blocked a ________ occurs.
- Vibration
- Light source
- Shadow
- Straight path
Correct Answer

A. Shadow

Explanation

When light is blocked, a shadow occurs. When an object blocks the path of light, it creates an area behind it where light cannot reach. This area is known as a shadow. Shadows are formed when light from a source is obstructed by an opaque object, causing a dark area to be cast on a surface opposite to the light source. Shadows are formed due to the absence of light in the blocked region, creating a contrast between the illuminated and shaded areas.

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12
6.

When light passes through water it is ____________
- Bent
- Reflected
- Blocked
- Sped up
Correct Answer

A. Bent

Explanation

When light passes through water, it undergoes a change in direction. This phenomenon is known as refraction. Refraction occurs because light travels at different speeds in different mediums, and when it enters water from air, it slows down, causing it to change direction or bend. Therefore, the correct answer is "bent."

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11
7.

Sound waves can be clearly seen from the naked eyes.
- True
- False
Correct Answer

A. False

Explanation

Sound waves cannot be seen by the naked eye because they are a form of mechanical energy that requires a medium, such as air or water, to travel through. Although we can perceive sound through our sense of hearing, we cannot visually see the actual sound waves themselves.

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2
8.

What is the cause of sounds being heard with your ears?
- High pitch
- Softness
- Vibrations
- Loudness
Correct Answer

A. Vibrations

Explanation

Sounds are heard with our ears because of vibrations. When an object vibrates, it creates sound waves that travel through the air or other mediums. These sound waves then enter our ears and are detected by the eardrums. The eardrums vibrate in response to the sound waves, and these vibrations are converted into electrical signals that are sent to the brain. The brain then interprets these signals as sound, allowing us to hear.

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12
9.

The speed of light is more than the speed of sound.
- True
- False
Correct Answer

A. True

Explanation

The speed of light is indeed greater than the speed of sound. Light travels at a speed of approximately 299,792 kilometers per second in a vacuum, while sound travels at a speed of approximately 343 meters per second in dry air at 20 degrees Celsius. Therefore, it is true that the speed of light is greater than the speed of sound.

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1
10.

Sound can be made by all EXCEPT
- Plucking a guitar
- Striking a drum
- Looking at doorbells
- Hitting a bell
Correct Answer

A. Looking at doorbells

Explanation

Sound is produced by vibrations that travel through a medium, such as air or water. Plucking a guitar, striking a drum, and hitting a bell all involve creating vibrations in the respective objects, which then produce sound waves. However, looking at doorbells does not involve any physical action that can create vibrations or sound waves. Therefore, looking at doorbells does not produce sound.

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12

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Current Version
Mar 25, 2025

Quiz Edited by
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Nov 23, 2010

Quiz Created by
Lauraflack

Light And Sound 3rd Grade Science Quiz

How is a shadow formed?

Most light energy on Earth comes from

Sunlight energy can heat up everything EXCEPT:

A light year is known as the distance that the light covers in a year.

When light is blocked a ________ occurs.

When light passes through water it is ____________

Sound waves can be clearly seen from the naked eyes.

What is the cause of sounds being heard with your ears?

The speed of light is more than the speed of sound.

Sound can be made by all EXCEPT