Elementary School Science Quiz: Observing Light And Visibility
20 questions · exam conditions
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Observing Light And VisibilityQuestion 1 of 20

Read about Marcus. The shoes stayed in the back of closet. In the dark, he could not see them. When the flashlight shined, he could see them. What changed?

Only the light changed, not the shoes
The shoes changed color to bright white
The shoes walked to the closet door
The closet moved farther away from Marcus
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Elementary School Science Quiz

Elementary School Science Quiz: Observing Light And Visibility

Practice Observing Light And Visibility in Elementary School Science with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Observing Light And Visibility, giving you a quick way to practice the rules, question types, and explanations that matter most for Elementary School Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Read about Marcus. The shoes stayed in the back of closet. In the dark, he could not see them. When the flashlight shined, he could see them. What changed?

  1. Only the light changed, not the shoes (correct answer)
  2. The shoes changed color to bright white
  3. The shoes walked to the closet door
  4. The closet moved farther away from Marcus
Explanation: This question tests understanding of 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Marcus's shoes stayed in the back of the closet the whole time. In the dark he couldn't see them, but when the flashlight shined, he could see them. The shoes didn't move or change - only the lighting changed. The correct answer says "Only the light changed, not the shoes" which correctly identifies that the shoes remained in place and unchanged, with only the illumination changing. This is the key concept: illumination (light shining on objects) is necessary for vision. Wrong answers like "The shoes walked to the closet door" are incorrect because they suggest the shoes moved when actually they stayed in place and only became visible with light. Students might choose this if they imagine objects move in darkness or think visibility requires movement. Do demonstrations: place shoes in a box, shine flashlight to show they're in the same spot. Ask: "Did the shoes move?" (no). "What changed?" (the light). Emphasize objects stay put whether in light or dark.

Question 2

Read about Marcus. Closet dark, he could not see shoes. Flashlight shined, he could see them. What made the shoes visible?​

  1. The shoes walked out to the door
  2. The flashlight light made the shoes visible (correct answer)
  3. The shoes were not in the closet before
  4. Marcus could smell the shoes in the dark
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated, emphasizing the understanding that light is necessary for visibility. We can only see objects when there is light because light shines on them and bounces into our eyes, allowing us to perceive them. In the dark, with no light, objects are still present but invisible since no light reflects off them into our eyes. When we introduce light, like from a flashlight, it illuminates the objects, making them visible again. In this story, Marcus was in a dark closet and could not see his shoes. When he shined the flashlight, he could see them. The shoes didn't move or change; the lighting changed. The correct answer says 'The flashlight light made the shoes visible' which correctly identifies that the light from the flashlight illuminated the shoes for visibility. A distractor like 'The shoes were not in the closet before' is wrong because it claims the objects were absent, when really they were invisible without light; students might choose this if they think darkness means things are gone instead of just not visible. To teach this, do demonstrations: show shoes in lit closet, darken it safely, discuss how they're still there but invisible, then use flashlight. Shine light to 'reveal' objects, and ask: 'Are the shoes gone or just invisible?' (just invisible). 'What do we need to see things?' (light).

Question 3

Read about Chen. At night, he could not see a red ball. In the morning, sunlight made it visible. When could Chen see the red ball?

  1. When the ball rolled to a new spot outside
  2. When the sun came up and made it bright (correct answer)
  3. When Chen listened hard for the ball
  4. When the ball was not there in the yard
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light; light shines on objects and bounces into our eyes, which lets us see. In the dark with no light, objects are still there but we cannot see them because no light is bouncing off them into our eyes; when we turn on a light or open curtains, light hits the objects and we can see them. In this story, Chen was outside at night and could not see the red ball; in the morning when sunlight came up, he could see it; the ball didn't move or change - the lighting changed. The correct answer says "When the sun came up and made it bright" which correctly identifies that Chen needed light to see the ball; light makes objects visible, and this is the key concept: illumination is necessary for vision. A distractor like "When the ball was not there in the yard" is wrong because it claims the object was absent when really the lack of light made it invisible; students might choose this if they think objects disappear in the dark instead of becoming invisible or don't understand light's role in vision. For teaching, do demonstrations: show an object in light, turn off lights safely, discuss how it's still there but invisible, then turn lights back on; use a flashlight in a dim room to 'reveal' objects and ask, 'Is the object gone or just invisible?' (just invisible) and 'What do we need to see things?' (light). Explain that light bounces off objects into our eyes - no light means we can't see; connect to everyday life like needing lights at night or a flashlight in dark closets, and watch for students who think objects vanish in the dark.

Question 4

Read about Maya. At night, her room was pitch dark. She could not see her chair. When the bedroom light turned on, she could see it. Why did the chair seem invisible before?

  1. The chair was there, but there was no light (correct answer)
  2. The chair walked away to another room quietly
  3. Maya forgot what a chair looks like at night
  4. The chair was too small to see in any light
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light; light shines on objects and bounces into our eyes, which lets us see. In the dark with no light, objects are still there but we cannot see them because no light is bouncing off them into our eyes; when we turn on a light or open curtains, light hits the objects and we can see them. In this story, Maya's room was pitch dark at night and she could not see her chair; when the bedroom light turned on, she could see it; the chair didn't move or change - the lighting changed. The correct answer says "The chair was there, but there was no light" which correctly identifies that darkness prevented seeing because objects need light to be visible; this is the key concept: illumination is necessary for vision. A distractor like "The chair walked away to another room quietly" is wrong because it claims the object moved when really the lack of light made it invisible; students might choose this if they think objects disappear or move in the dark instead of becoming invisible. For teaching, do demonstrations: show an object in light, turn off lights safely, discuss how it's still there but invisible, then turn lights back on; use a flashlight in a dim room to 'reveal' objects and ask, 'Is the object gone or just invisible?' (just invisible) and 'What do we need to see things?' (light). Explain that light bounces off objects into our eyes - no light means we can't see; connect to everyday life like needing lights at night or a flashlight in dark closets, and watch for students who think objects vanish in the dark.

Question 5

Read about Chen. At night he could not see the red ball. In the morning, it was bright and he could see it. Why can we see things?

  1. We can see things when there is light (correct answer)
  2. We can see things only when they make noise
  3. We can see things because they always move fast
  4. We can see things because they are always close
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light; light shines on objects and bounces into our eyes, which lets us see. In the dark with no light, objects are still there but we cannot see them because no light is bouncing off them into our eyes; when we turn on a light or open curtains, light hits the objects and we can see them. In this story, Chen was outside at night and could not see the red ball; in the morning when it was bright, he could see it; the ball didn't move or change - the lighting changed. The correct answer says "We can see things when there is light" which correctly identifies that light is necessary for seeing objects; this is the key concept: illumination is necessary for vision. A distractor like "We can see things because they always move fast" is wrong because it attributes visibility to movement when really it's the presence of light; students might choose this if they confuse other senses or properties with the need for light in vision. For teaching, do demonstrations: show an object in light, turn off lights safely, discuss how it's still there but invisible, then turn lights back on; use a flashlight in a dim room to 'reveal' objects and ask, 'Is the object gone or just invisible?' (just invisible) and 'What do we need to see things?' (light). Explain that light bounces off objects into our eyes - no light means we can't see; connect to everyday life like needing lights at night or a flashlight in dark closets, and watch for students who think objects vanish in the dark.

Question 6

Read about Jamal. Curtains closed made the room dark, and he could not see books. Curtains opened let sunlight in, and he could see books. What did Jamal learn about seeing?

  1. We need light to see things clearly (correct answer)
  2. Books can only be seen when they are new
  3. Curtains change books into different colors
  4. Sunlight makes books move off the shelf
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light; light shines on objects and bounces into our eyes, which lets us see. In the dark with no light, objects are still there but we cannot see them because no light is bouncing off them into our eyes; when we turn on a light or open curtains, light hits the objects and we can see them. In this story, Jamal's curtains were closed making the room dark, and he could not see his books; when curtains opened letting sunlight in, he could see them; the books didn't move or change - the lighting changed. The correct answer says "We need light to see things clearly" which correctly identifies the key concept that light is necessary for visibility. A distractor like "Sunlight makes books move off the shelf" is wrong because it attributes movement to light when really light just makes them visible; students might choose this if they don't understand light's role in vision and confuse it with other changes. For teaching, do demonstrations: show an object in light, turn off lights safely, discuss how it's still there but invisible, then turn lights back on; use a flashlight in a dim room to 'reveal' objects and ask, 'Is the object gone or just invisible?' (just invisible) and 'What do we need to see things?' (light). Explain that light bounces off objects into our eyes - no light means we can't see; connect to everyday life like needing lights at night or a flashlight in dark closets, and watch for students who think objects vanish in the dark.

Question 7

Read about Marcus. Closet was dark, so shoes were invisible. He shined a flashlight and saw them. How did the flashlight help Marcus?​

  1. It made the shoes appear out of nowhere
  2. It made the closet bright so he could see (correct answer)
  3. It moved the shoes to the front
  4. It made Marcus stop blinking his eyes
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated, emphasizing the understanding that light is necessary for visibility. We can only see objects when there is light because light shines on them and bounces into our eyes, allowing us to perceive them. In the dark, with no light, objects are still present but invisible since no light reflects off them into our eyes. When we introduce light, like from a flashlight, it illuminates the objects, making them visible again. In this story, Marcus was looking in a dark closet and could not see his shoes. When he shined a flashlight, he could see them. The shoes didn't move or change; the lighting changed. The correct answer says 'It made the closet bright so he could see' which correctly identifies that the flashlight provided the light needed for visibility, as illumination is necessary for vision. A distractor like 'It made the shoes appear out of nowhere' is wrong because it claims the objects magically appeared, when really the light just made them visible; students might choose this if they don't understand that objects remain present but invisible in the dark. To teach this, do demonstrations: show shoes in a lit closet, turn off lights safely, discuss how they're still there but invisible, then use flashlight. Shine a flashlight to 'reveal' objects, and ask: 'Are the shoes gone or just invisible?' (just invisible). 'What do we need to see things?' (light).

Question 8

Read about Sofia. Flashlight off, the toy car looked invisible. Flashlight on, she saw it. What happens when there is no light?​

  1. Objects become invisible and are hard to see (correct answer)
  2. Objects always move to a new place
  3. Objects disappear and are no longer there
  4. Your ears help you see better in darkness
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated, emphasizing the understanding that light is necessary for visibility. We can only see objects when there is light because light shines on them and bounces into our eyes, allowing us to perceive them. In the dark, with no light, objects are still present but invisible since no light reflects off them into our eyes. When we introduce light, like from a flashlight, it illuminates the objects, making them visible again. In this story, Sofia had her flashlight off, making the toy car look invisible in the dark. When she turned the flashlight on, she saw it. The toy car didn't move or change; the lighting changed. The correct answer says 'Objects become invisible and are hard to see' which correctly identifies that without light, objects are invisible, as illumination is necessary for vision. A distractor like 'Objects disappear and are no longer there' is wrong because it claims objects cease to exist in the dark, when really they are just not visible; students might choose this if they think darkness makes things vanish instead of understanding invisibility due to no light. To teach this, do demonstrations: show a toy in light, turn off flashlight safely, discuss how it's still there but invisible, then turn it back on. Use a flashlight to 'reveal' objects, and ask: 'Is the toy gone or just invisible?' (just invisible). 'What do we need to see things?' (light).

Question 9

Read about Yuki. Her lamp was off, and her desk looked black. She turned on the lamp and saw her pencils. What made the pencils visible?

  1. The pencils changed shape when the lamp turned on.
  2. The lamp light made the pencils visible on the desk. (correct answer)
  3. The pencils were not there until the lamp made them.
  4. The pencils were too far away to see up close.
Explanation: This question tests understanding of NGSS standard 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Yuki's lamp was off making her desk look black, and she couldn't see her pencils. When she turned on the lamp, the light made the pencils visible. The pencils didn't move or change - the lighting changed. The correct answer says "The lamp light made the pencils visible on the desk" which correctly identifies that lamp light provided the illumination needed to see the pencils. Light makes objects visible. This is the key concept: illumination (light shining on objects) is necessary for vision. An error like "The pencils were not there until the lamp made them" is wrong because it suggests the lamp created the pencils rather than just making existing pencils visible. Students might choose this if they think light creates objects rather than reveals them. Do demonstrations: place pencils on desk, turn off lights (safely) so desk looks black, turn on desk lamp to show pencils. Ask: "Were the pencils there in the dark?" (yes). "Why couldn't we see them?" (no light). Explain: Lamps shine light on our desks so we can see our school supplies. Connect to doing homework - we need good lighting to see our work.

Question 10

Read about Jamal. In the dark room, he could not see his books. When he opened the curtains, sunlight came in. Why could Jamal not see his books at first?

  1. The room was dark, so he needed light to see. (correct answer)
  2. The books were covered up under a blanket.
  3. The books were too far away on the shelf.
  4. The books were gone and not in the room.
Explanation: This question tests understanding of NGSS standard 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Jamal was in a dark room where he could not see his books. When he opened the curtains, sunlight came in and he could see the books. The books didn't move or change - the lighting changed. The correct answer says "The room was dark, so he needed light to see" which correctly identifies that darkness prevented seeing and light was necessary. Light makes objects visible. This is the key concept: illumination (light shining on objects) is necessary for vision. An error like "The books were gone and not in the room" is wrong because it claims the books weren't there when really they just couldn't be seen due to lack of light. Students might choose this if they confuse dark condition with object absence. Do demonstrations: place books on table, turn off lights (safely), discuss how books are still there but invisible in dark, open curtains or turn lights on. Ask: "Are the books gone or just invisible?" (just invisible). "What changed when we opened the curtains?" (light came in). Explain: Sunlight or room lights bounce off objects into our eyes - that's how we see. Connect to everyday: dark rooms need lights or windows opened to see things inside.

Question 11

Read about Jamal. Before sunlight, the room was dark and books looked black. After sunlight, he could see the books clearly. What did Jamal need to see the books?​

  1. Jamal needed the books to jump off the shelf.
  2. Jamal needed light from the sun to see them. (correct answer)
  3. Jamal needed to hear the books so he could see.
  4. Jamal needed the books to be new and shiny.
Explanation: This question tests understanding of 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, before sunlight came in, Jamal's room was dark and the books looked black (couldn't see them clearly). After sunlight entered, he could see the books clearly. The books didn't change - the light made them visible. The correct answer says "Jamal needed light from the sun to see them" which correctly identifies that sunlight (a source of light) was necessary for seeing the books. Light makes objects visible. This is the key concept: we need light sources to see. Wrong answers like "Jamal needed to hear the books so he could see" are incorrect because they confuse different senses - hearing doesn't help us see, only light does. Students might choose this if they don't understand that seeing requires light specifically, not other sensory input. Do demonstrations: compare what we can do with different senses in the dark - we can hear, touch, and smell, but cannot see without light. Ask: "If someone talks in the dark, can you hear them?" (yes). "Can you see them?" (no). "What's missing?" (light). This helps students understand that only light enables vision.

Question 12

Read about Marcus. His closet was dark, so he could not see shoes. He shined a flashlight inside, and he saw them. How did the flashlight help Marcus?

  1. It made light so the shoes were visible (correct answer)
  2. It moved the shoes to the front of closet
  3. It made the shoes disappear into the dark
  4. It helped Marcus hear where the shoes were
Explanation: This question tests understanding of 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Marcus's closet was dark and he could not see his shoes. When he shined a flashlight inside, he could see them. The shoes didn't move or change - the flashlight provided light. The correct answer says "It made light so the shoes were visible" which correctly identifies that the flashlight provided illumination that made the shoes visible. This is the key concept: illumination (light shining on objects) is necessary for vision. Wrong answers like "It moved the shoes to the front of closet" are incorrect because they suggest the flashlight physically moved objects when it actually just provided light. Students might choose this if they don't understand that light, not movement, makes things visible. Do demonstrations: use a flashlight in a dark closet or box to "find" objects. Ask: "Does the flashlight move things?" (no). "What does it do?" (makes light). Show how the flashlight beam reveals objects wherever it shines.

Question 13

Read about Emma. With the lamp off, her room was dark. She could not see her stuffed animals. With the lamp on, she could see them. Why could Emma see them after the lamp turned on?

  1. The lamp light made the animals visible (correct answer)
  2. The animals were hidden under the bed before
  3. The animals were too small to see at first
  4. Emma was in the wrong room at first
Explanation: This question tests understanding of 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Emma could not see her stuffed animals when the lamp was off and the room was dark. When she turned the lamp on, she could see them. The animals didn't move or appear - they became visible with light. The correct answer says "The lamp light made the animals visible" which correctly identifies that the lamp provided light that allowed Emma to see the stuffed animals. This is the key concept: illumination (light shining on objects) is necessary for vision. Wrong answers like "The animals were hidden under the bed before" are incorrect because they suggest the animals were in a different location when actually they were in the same place but invisible without light. Students might choose this if they think invisible objects must be hidden somewhere else, not understanding that darkness makes things invisible even when they're right there. Do demonstrations: show stuffed animals on a bed, turn lights off and on. Ask: "Were they under the bed?" (no). "Were they there the whole time?" (yes, just invisible in dark).

Question 14

Read about Carlos. The hallway light was off, so it was dark. He could not see his blue backpack. When the light turned on, he could see it. What did Carlos need to see the backpack?

  1. Light from the hallway lamp to see clearly (correct answer)
  2. The backpack to move closer to his feet
  3. His ears to listen for the backpack
  4. The backpack to disappear into the darkness
Explanation: This question tests the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Carlos was in a dark hallway with the light off and could not see his blue backpack. When the light turned on, he could see it. The backpack didn't move or change - the lighting changed. The correct answer says "Light from the hallway lamp to see clearly" which correctly identifies that Carlos needed light to see the backpack. Light makes objects visible. This is the key concept: illumination (light shining on objects) is necessary for vision. Wrong answers like "The backpack to move closer to his feet" are incorrect because they suggest the object needed to move rather than needing light. Students might choose this if they think proximity is more important than light for seeing. Do demonstrations: place backpack in hallway, turn lights off and on to show visibility changes. Ask: "What did Carlos need?" (light). "Did the backpack need to move?" (no). Explain: Hallway lamps provide light for dark spaces. The light shines on everything in the hallway, including backpacks, making them visible. Without the lamp on, the hallway is dark and we cannot see what's there.

Question 15

Read about Maya. At night, lights off, room was pitch dark. She could not see her chair. Mom turned on the light. Why could Maya not see the chair at first?

  1. The chair was too small to see
  2. There was no light, so she could not see (correct answer)
  3. The chair was hidden under a blanket
  4. Maya was in the wrong room
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated, emphasizing the understanding that light is necessary for visibility. We can only see objects when there is light because light shines on them and bounces into our eyes, allowing us to perceive them. In the dark, with no light, objects are still present but invisible since no light reflects off them into our eyes. When we introduce light, like from a room light, it illuminates the objects, making them visible again. In this story, Maya was in her room at night with lights off, making it pitch dark, and she could not see her chair. When her mom turned on the light, she could see it. The chair didn't move or change; the lighting changed. The correct answer says 'There was no light, so she could not see' which correctly identifies that the absence of light prevented visibility, as illumination is necessary for vision. A distractor like 'The chair was hidden under a blanket' is wrong because it attributes invisibility to a physical cover, not lack of light; students might choose this if they focus on wrong causes like obstruction instead of light's role. To teach this, do demonstrations: show a chair in light, turn off lights safely, discuss how it's still there but invisible, then turn lights back on. Use a light switch to 'reveal' objects, and ask: 'Is the chair gone or just invisible?' (just invisible). 'What do we need to see things?' (light).

Question 16

Read about Amir. The bathroom light was off, and it was dark. He could not see the soap on the sink. When he turned on the light, he could see it. What happens when there is no light?

  1. Objects become hard to see in the dark (correct answer)
  2. Objects disappear and are not there anymore
  3. Objects grow bigger, so we cannot see them
  4. Objects make more sound, so we can see
Explanation: This question tests the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Amir was in a dark bathroom with the light off and could not see the soap on the sink. When he turned on the light, he could see it. The soap didn't move or change - the lighting changed. The correct answer says "Objects become hard to see in the dark" which correctly identifies that darkness makes objects difficult or impossible to see (but they're still there). Light makes objects visible. This is the key concept: illumination (light shining on objects) is necessary for vision. Wrong answers like "Objects disappear and are not there anymore" are incorrect because they claim objects actually vanish in darkness rather than just becoming invisible. Students might choose this if they think darkness makes things disappear instead of just making them unseeable. Do demonstrations: place soap on counter, turn bathroom light off and on. Ask: "Is the soap still there in the dark?" (yes). "What happens to objects in the dark?" (become hard/impossible to see). Explain: Dark means no light. Objects don't disappear - they're still there but we can't see them without light. This is why we need lights in bathrooms, especially at night.

Question 17

Read about Chen. At night, he could not see his red ball. In the morning sunlight, he could see it. When could Chen see the ball?

  1. When sunlight was out and it was bright (correct answer)
  2. When the ball rolled away from the yard
  3. When Chen listened for the ball to bounce
  4. When the ball became bigger and easier to see
Explanation: This question tests understanding of 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Chen could not see his red ball at night when it was dark. In the morning when there was sunlight, he could see the ball. The ball didn't move or change - the lighting changed from dark night to bright morning. The correct answer says "When sunlight was out and it was bright" which correctly identifies that Chen could see the ball when there was sunlight providing illumination. This is the key concept: illumination (light shining on objects) is necessary for vision. Wrong answers like "When the ball rolled away from the yard" are incorrect because they suggest the ball moved, when actually it stayed in place and only the lighting changed. Students might choose this if they don't understand that light, not location, determines visibility. Do demonstrations: place a ball outside, observe it during day and at dusk/night (safely). Ask: "Is the ball still there at night?" (yes). "Why can't we see it well?" (no sunlight). Explain how sunlight during day lets us see outdoor objects, but at night without sunlight we cannot see them well.

Question 18

Read about Sofia. In the dark, her toy car looked invisible. When the flashlight shined, she saw the car. Why can we see things?

  1. We see things when there is light on them (correct answer)
  2. We see things only when they make sounds
  3. We see things because they move fast
  4. We see things because they change into new objects
Explanation: This question tests understanding of 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, Sofia's toy car looked invisible in the dark but became visible when the flashlight shined on it. The car didn't change - the light made it visible. The correct answer says "We see things when there is light on them" which correctly identifies the fundamental principle that light must shine on objects for us to see them. This is the key concept: illumination (light shining on objects) is necessary for vision. Wrong answers like "We see things only when they make sounds" are incorrect because they confuse different senses - we hear sounds but see with light. Students might choose this if they don't understand that seeing requires light, not sound. Do demonstrations: make sounds in the dark to show we can hear but not see. Turn on light to show now we can see. Ask: "Can sounds help us see?" (no). "What do we need to see?" (light). Explain the difference between hearing (ears detect sound) and seeing (eyes detect light).

Question 19

Read about Keisha. The power went out, and the kitchen was dark. She could not see the apples on the counter. When a candle was lit, she could see them. When could Keisha see the apples?

  1. When the candle was lit and gave light (correct answer)
  2. When the apples rolled off the counter
  3. When the apples were not in the kitchen
  4. When Keisha closed her eyes to look harder
Explanation: This question tests the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light. Light shines on objects and bounces into our eyes, which lets us see. In the dark (no light), objects are still there but we cannot see them because no light is bouncing off them into our eyes. In this story, the power went out making Keisha's kitchen dark, and she could not see the apples on the counter. When a candle was lit, she could see them. The apples didn't move or change - the candle provided light. The correct answer says "When the candle was lit and gave light" which correctly identifies that the candle's light made the apples visible. Light makes objects visible. This is the key concept: illumination (light shining on objects) is necessary for vision. Wrong answers like "When the apples rolled off the counter" are incorrect because they suggest the apples moved, when they stayed on the counter and only became visible with light. Students might choose this if they think objects must move or fall to be noticed. Do demonstrations: simulate power outage safely, use battery-operated candle to show how its light reveals objects. Ask: "When could Keisha see?" (when candle gave light). "Did apples move?" (no). Explain: Candles make light by burning. This light shines on nearby objects like apples, making them visible even when electric lights don't work. Connect to safety: real candles need adult supervision.

Question 20

Read about Emma. In the dark, she could not see her stuffed bear. When the lamp turned on, she could see it. What did Emma need to see the bear?

  1. The bear to change colors so it was brighter
  2. The lamp light to make the bear visible (correct answer)
  3. The bear to be taken out of the room
  4. Emma to close her eyes until morning came
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light; light shines on objects and bounces into our eyes, which lets us see. In the dark with no light, objects are still there but we cannot see them because no light is bouncing off them into our eyes; when we turn on a light or open curtains, light hits the objects and we can see them. In this story, Emma was in the dark and could not see her stuffed bear; when the lamp turned on, she could see it; the bear didn't move or change - the lighting changed. The correct answer says "The lamp light to make the bear visible" which correctly identifies that Emma needed light to see the bear; light makes objects visible, and this is the key concept: illumination is necessary for vision. A distractor like "The bear to be taken out of the room" is wrong because it claims the object was removed when really the lack of light made it invisible; students might choose this if they think objects disappear in the dark instead of becoming invisible or confuse darkness with absence. For teaching, do demonstrations: show an object in light, turn off lights safely, discuss how it's still there but invisible, then turn lights back on; use a flashlight in a dim room to 'reveal' objects and ask, 'Is the object gone or just invisible?' (just invisible) and 'What do we need to see things?' (light). Explain that light bounces off objects into our eyes - no light means we can't see; connect to everyday life like needing lights at night or a flashlight in dark closets, and watch for students who think objects vanish in the dark.