Light And Sound 3rd Grade Science Quiz

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Light And Sound 3rd Grade Science Quiz - 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 and comprehensive quiz below. All the best to you with this wonderful quiz, and have fun!


Questions and Answers
  • 1. 

    How is a shadow formed?

    • A.

      Turning off a light

    • B.

      Blocking the path of light

    • C.

      Shining light on a dark area

    • D.

      Vibrations

    Correct Answer
    B. Blocking the path of light
    Explanation
    A shadow is formed by blocking the path of light. When an object is placed in the path of light, it prevents the light from reaching a certain area behind it. This creates a dark silhouette or shadow on the surface opposite to the light source. The object acts as an obstruction, causing the light to be blocked and creating the shadow.

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  • 2. 

    Most light energy on Earth comes from

    • A.

      The moon

    • B.

      Street lights

    • C.

      Candles

    • D.

      The sun

    Correct Answer
    D. 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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  • 3. 

    Sunlight energy can heat up everything EXCEPT:

    • A.

      Sand

    • B.

      Water

    • C.

      Cement

    • D.

      An indoor t.v.

    Correct Answer
    D. An indoor t.v.
    Explanation
    Sunlight energy can heat up objects that have the ability to absorb and retain heat, such as sand, water, and cement. However, an indoor TV does not have the same capacity to absorb and retain heat, as it is an electronic device designed to dissipate heat rather than absorb it. Therefore, sunlight energy cannot effectively heat up an indoor TV.

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  • 4. 

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

    • A.

      True

    • B.

      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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  • 5. 

    When light is blocked a ________ occurs.

    • A.

      Vibration

    • B.

      Light source

    • C.

      Shadow

    • D.

      Straight path

    Correct Answer
    C. 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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  • 6. 

    When light passes through water it is ____________

    • A.

      Bent

    • B.

      Reflected

    • C.

      Blocked

    • D.

      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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  • 7. 

    Sound waves can be clearly seen from the naked eyes.

    • A.

      True

    • B.

      False

    Correct Answer
    B. 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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  • 8. 

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

    • A.

      High pitch

    • B.

      Softness

    • C.

      Vibrations

    • D.

      Loudness

    Correct Answer
    C. 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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  • 9. 

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

    • A.

      True

    • B.

      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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  • 10. 

    Sound can be made by all EXCEPT

    • A.

      Plucking a guitar

    • B.

      Striking a drum

    • C.

      Looking at doorbells

    • D.

      Hitting a bell

    Correct Answer
    C. 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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  • Current Version
  • Aug 24, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 23, 2010
    Quiz Created by
    Lauraflack
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