Elementary School Science Quiz: Materials Change Light

20 questions · exam conditions

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Materials Change LightQuestion 1 of 20

Read Jamal's test: one yellow sheet made yellow light; two made darker. What is the evidence that more layers changed the light?

Two yellow sheets let less light through, so the light beyond looked darker yellow.

Yellow is a happy color, so it made the light brighter each time.

The light looked darker yellow, but Jamal did not use any flashlight.

Objects beyond looked yellow, so the objects made the light turn yellow.

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Elementary School Science Quiz

Elementary School Science Quiz: Materials Change Light

Practice Materials Change Light 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 Materials Change Light, 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 Jamal's test: one yellow sheet made yellow light; two made darker. What is the evidence that more layers changed the light?

Two yellow sheets let less light through, so the light beyond looked darker yellow. (correct answer)
Yellow is a happy color, so it made the light brighter each time.
The light looked darker yellow, but Jamal did not use any flashlight.
Objects beyond looked yellow, so the objects made the light turn yellow.

Explanation: This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: colored materials filter light to their color, and adding more layers of the same material increases the filtering effect, making the light darker while keeping the same color. Jamal observed one and two yellow sheets with light. Evidence collected: one sheet made yellow light, two sheets made darker yellow light, and objects beyond looked increasingly yellow with more layers. This shows that yellow sheets filter out non-yellow light, and more layers filter more light, making it darker but still yellow. The correct answer says "Two yellow sheets let less light through, so the light beyond looked darker yellow" which correctly connects material property → light change → visibility effect using evidence. The answer explains that more layers let less light through (increased filtering), resulting in darker yellow light - showing understanding of how layering affects light intensity while maintaining color. Incorrect answers like "Objects beyond looked yellow, so the objects made the light turn yellow" are wrong because they reverse causation - the yellow sheets change the light to yellow, which then makes objects look yellow, not the other way around. Students might choose this if they focus on the final observation without understanding the causal sequence. Help students see the pattern with systematic testing: shine light through 1, 2, and 3 layers of the same colored material, observing how light gets progressively darker but stays the same color. Use sentence frames: "More layers of yellow → filter more light → makes darker yellow light → objects look darker yellow." Emphasize the evidence pattern: consistent color change with varying darkness proves the material is filtering light.

Question 2

Read Sofia's test: mirror bounced light; wall spread light. What did Sofia learn about shiny materials and light?

Shiny mirrors reflect light back, so you see reflections and not through the mirror. (correct answer)
Shiny mirrors let light pass through, so you see behind them clearly.
You cannot see through a mirror, but that does not involve light changes.
The wall was white, so it made the mirror reflect light back.

Explanation: This question aligns with the skill 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much so you can see clearly beyond, colored materials change the light's color making objects beyond look that color, frosted or bumpy materials scatter light so objects beyond look blurry, thick materials block light so you cannot see beyond, and mirrors reflect light back so you see a reflection but not beyond. The way a material changes light determines what you can see through or beyond it. Sofia observed shiny mirror with light; evidence collected: mirror bounced light back, wall spread light, and saw reflection not through. For example, shiny mirror reflected light back showing reflection. This shows the material's shininess changed the light by reflecting it which changed visibility by showing reflection instead of beyond. The correct answer says 'Shiny mirrors reflect light back, so you see reflections and not through the mirror' which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that light bounced, explains the shininess caused reflection, and this prevented seeing through. This is a complete evidence-based explanation. A distractor like 'Shiny mirrors let light pass through, so you see behind them clearly' is wrong because it attributes to wrong material property and contradicts the evidence. Students might choose this if they do not understand how material properties affect light or confuse reflection with transmission. Help students see the full causal chain with sentence frames: 'The material is shiny → so light reflects back → which shows reflection not beyond.' Do demonstrations showing material → light change: shine light on shiny mirror, watch it reflect. Then show light change → visibility change: reflection shows image, not through. Connect both: material changed light, changed light changed visibility. Use comparisons: same light on mirror vs wall - compare effects. Emphasize evidence: multiple observations showing same pattern (shiny always reflects) proves material causes effect. Watch for: students who observe but cannot explain cause, or who only focus on final result (seeing reflection) without connecting to material property and how it changed light.

Question 3

Jamal stacked yellow and blue cellophane and shined a flashlight. The light looked green and his paper looked green. How did the material change the light and what he saw?

The paper turned green first, so the light became green after.
The colored sheets made green light, so the paper beyond looked green too. (correct answer)
The sheets were smooth, so they blocked all light and made darkness.
The light changed to green, but it did not change what he saw.

Explanation: This question tests 1st-PS4-3: investigating how combining materials affects light and visibility. When different colored materials overlap, they create new colors by filtering light - yellow and blue make green. Jamal observed stacked yellow and blue cellophane with a flashlight and collected evidence: the light looked green after passing through both sheets, his paper beyond looked green, showing the combined materials created green light. This demonstrates how layered colored materials filter white light to create new colors, which then makes objects beyond appear that new color. The correct answer B states "The colored sheets made green light, so the paper beyond looked green too" which correctly connects combined materials → light color change → visibility effect. Answer A reverses causation by claiming the paper turned green first. To teach this, demonstrate color mixing with overlapping colored sheets, showing how white light becomes colored when passing through. Help students trace the sequence: materials filter light → filtered light has new color → objects in colored light look that color.

Question 4

Emma compared clear and red plastic with a flashlight. Clear stayed white and bright; red turned light red. How does colored plastic change what you can see beyond it?

Colored plastic makes red light, so things beyond can look red instead of normal. (correct answer)
Colored plastic makes things red, so the light turns red later.
Colored plastic blocks all light, so you see nothing beyond it.
You see red beyond it, but the light stayed white and bright.

Explanation: This question assesses 1st-PS4-3: understanding how colored materials affect light and visibility. Colored plastic filters white light to create colored light, which makes objects beyond appear that color. Emma compared plastics with a flashlight and collected evidence: clear plastic kept light white and bright, red plastic turned light red, showing how material color affects transmitted light. This demonstrates that colored materials absorb some colors and let others through, changing white light to colored light. The correct answer A states "Colored plastic makes red light, so things beyond can look red instead of normal" which correctly connects material color → light filtering → altered visibility. Answer B reverses the sequence by claiming things turn red before light does. Help students understand filtering by demonstrating white light through colored materials. Show how the colored material changes the light first, then that colored light makes everything beyond look that color. Use comparisons between clear and colored materials to highlight the difference in what you see beyond each.

Question 5

Read Carlos's test. How did wax paper change light and seeing?

Wax paper was clear, so the light stayed bright and details looked sharp.
Wax paper scattered light and made it dim, so shapes beyond looked blurry. (correct answer)
Wax paper made him see blurry, but the light stayed the same brightness.
Wax paper reflected light back, so nothing could be seen beyond it.

Explanation: This question tests understanding of 1st-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much, colored materials change light color, frosted/bumpy materials scatter light making objects beyond look blurry, thick materials block light, and mirrors reflect light back. Carlos observed wax paper with light and collected evidence: light became dimmer when passing through, shapes beyond looked blurry instead of sharp, and the wall spot was less bright with wax paper than without. This shows the wax paper's translucent/frosted property scattered the light, which changed visibility by making everything beyond appear blurry and dim. The correct answer "Wax paper scattered light and made it dim, so shapes beyond looked blurry" correctly connects material property → light change → visibility effect using evidence, explaining that wax paper's scattering property caused light to dim and scatter, resulting in blurry vision beyond. Incorrect answers like "Wax paper made him see blurry, but the light stayed the same brightness" fail because they only mention one part of the chain (blurry vision) without connecting to how the material changed the light - students might choose this if they focus on the final result without understanding the full cause-effect relationship. Help students see the full causal chain with sentence frames: "The material is [translucent/frosted] → so light [scatters and dims] → which makes things beyond look [blurry]." Do demonstrations comparing clear plastic vs wax paper, measuring brightness on the wall and observing clarity of objects beyond to show both light dimming and vision blurring.

Question 6

Read Emma's test. How did clear plastic change light and seeing?

Clear plastic blocked light, so she saw only a dark shadow beyond it.
Clear plastic let bright white light pass, so she saw her hand clearly beyond. (correct answer)
Clear plastic made light red, so her hand beyond looked red and dark.
Clear plastic reflected light back, so she saw herself like a mirror.

Explanation: This question tests understanding of 1st-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much so you can see clearly beyond, while colored materials change light color, frosted materials scatter light, and opaque materials block light. Emma observed clear plastic with light and collected evidence: bright white light passed through unchanged, she could see her hand clearly beyond the plastic, and the light remained bright white on the wall. This shows the clear plastic's transparent property allowed light to pass through without scattering or color change, maintaining clear visibility. The correct answer "Clear plastic let bright white light pass, so she saw her hand clearly beyond" correctly connects material property → light change → visibility effect using evidence, explaining that the clear material didn't change the light, allowing clear vision. Incorrect answers like "Clear plastic blocked light, so she saw only a dark shadow beyond it" fail because they describe the opposite of what clear materials do - students might choose this if they confuse transparent with opaque materials or don't understand that "clear" means light passes through. Help students see the full causal chain with sentence frames: "The material is [clear/transparent] → so light [passes through unchanged] → which makes things beyond look [clear and normal]." Do demonstrations comparing clear plastic, colored plastic, and cardboard to show how only clear materials maintain both light brightness and clear visibility.

Question 7

Read Carlos's test. Which observation proves wax paper dimmed light?

With wax paper, the wall spot looked dimmer than without wax paper. (correct answer)
Without wax paper, he could see the lamp across the room.
Wax paper felt smooth, so light must have stayed bright.
The room was quiet, so the light looked fuzzy on the wall.

Explanation: This question tests understanding of 1st-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. To prove how materials change light, scientists compare observations with and without the material - if the light spot looks different with the material present, this is evidence the material changed the light. Carlos observed wax paper's effect and collected evidence: without wax paper the wall spot was bright, with wax paper the wall spot looked dimmer, and he could also see less clearly through the wax paper. This comparison shows the wax paper scattered and absorbed some light, making it dimmer. The correct answer "With wax paper, the wall spot looked dimmer than without wax paper" correctly identifies the key evidence - the comparison showing light became dimmer proves the wax paper changed the light. Incorrect answers like "The room was quiet, so the light looked fuzzy on the wall" fail because they connect unrelated observations (sound and light) or don't provide comparative evidence - students might choose this if they don't understand that proving change requires comparison or they mix up different senses. Help students understand scientific evidence with sentence frames: "Without material: [observation], With material: [different observation], This proves: [what material did to light]." Practice before/after comparisons with various materials, emphasizing that the difference between observations is the evidence of how the material changed light.

Question 8

Read Sofia's test: flashlight on mirror bounced back; wall spread light. What is the evidence that a mirror changes light?

The mirror let light pass through, so Sofia saw objects behind it clearly.
Light hit the mirror and bounced back bright, so she saw a reflection, not through it. (correct answer)
Sofia saw a shiny mirror, so the wall must have reflected light too.
The light was bright on the wall, but this did not show what the mirror did.

Explanation: This question aligns with the skill 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much so you can see clearly beyond, colored materials change the light's color making objects beyond look that color, frosted or bumpy materials scatter light so objects beyond look blurry, thick materials block light so you cannot see beyond, and mirrors reflect light back so you see a reflection but not beyond. The way a material changes light determines what you can see through or beyond it. Sofia observed a mirror with light; evidence collected: flashlight on mirror bounced back bright, wall spread light, and she saw a reflection not through it. For example, light hit the mirror and bounced back, showing reflection. This shows the material's shininess changed the light by reflecting it which changed visibility by preventing seeing beyond. The correct answer says 'Light hit the mirror and bounced back bright, so she saw a reflection, not through it' which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that light bounced back, explains the material's surface caused reflection, and this made things beyond invisible. This is a complete evidence-based explanation. A distractor like 'The mirror let light pass through, so Sofia saw objects behind it clearly' is wrong because it attributes to wrong material property and reverses the actual effect. Students might choose this if they do not understand how material properties affect light or confuse reflection with transmission. Help students see the full causal chain with sentence frames: 'The material is shiny → so light reflects back → which makes you see reflection not beyond.' Do demonstrations showing material → light change: shine light on mirror, watch it bounce back. Then show light change → visibility change: reflected light shows your face, not through. Connect both: material changed light, changed light changed visibility. Use comparisons: same light on mirror vs wall - compare what you see. Emphasize evidence: multiple observations showing same pattern (mirrors always reflect) proves material causes effect. Watch for: students who observe but cannot explain cause, or who only focus on final result (seeing reflection) without connecting to material property and how it changed light.

Question 9

Jamal used yellow cellophane: one sheet made yellow light; two sheets made darker yellow. What evidence shows more layers change light?

Two sheets made the light darker, so objects beyond looked darker yellow too. (correct answer)
One sheet made objects look yellow, so the light stayed white.
More layers are heavier, so they made the light darker and yellow.
The light looked yellow, but Jamal did not look beyond it.

Explanation: This question assesses 1st-PS4-3: investigating how material thickness affects light. Multiple layers of colored material make light darker while maintaining the color change. Jamal observed yellow cellophane layers and collected evidence: one sheet made yellow light, two sheets made darker yellow light, and objects beyond looked correspondingly darker yellow. This shows that more layers of the same colored material absorb more light, making it darker while keeping the yellow color. The correct answer A states "Two sheets made the light darker, so objects beyond looked darker yellow too" which correctly connects material layers → light darkening → visibility effect. Answer C incorrectly attributes the effect to weight rather than light absorption. Help students investigate this pattern by layering colored cellophane sheets and observing how each additional layer makes the light darker. Use sentence frames: "More layers → absorb more light → make things beyond look darker." This helps students understand that material thickness affects how much light passes through.

Question 10

Read Emma's test: clear plastic stayed bright; red plastic made red light. What evidence shows red plastic changes light?

The red plastic filtered white light to red, so her hand beyond looked red each time. (correct answer)
The light was red, but Emma did not test any other material.
Her hand looked red beyond the plastic, so the hand changed the light.
The red plastic was heavy, so it made the light turn red.

Explanation: This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much, while colored materials filter light to change its color, making objects beyond look that color. Emma observed clear plastic and red plastic with light. Evidence collected: clear plastic stayed bright (light passed through unchanged), red plastic made red light (filtered white light to red), and her hand beyond the red plastic looked red each time. This shows the red plastic's color property changed the light from white to red, which changed visibility by making everything beyond look red. The correct answer says "The red plastic filtered white light to red, so her hand beyond looked red each time" which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that her hand looked red beyond the plastic, explains the red plastic filtered the light, and this made things beyond look red - a complete evidence-based explanation. Incorrect answers like "Her hand looked red beyond the plastic, so the hand changed the light" are wrong because they reverse causation - the material changes the light, not the object beyond it. Students might choose this if they don't understand the causal chain and think the final observation (red hand) causes the light change rather than being the result. Help students see the full causal chain with sentence frames: "The material is red → so light becomes red → which makes things beyond look red." Do demonstrations showing material → light change: shine white light through red plastic, watch light become red on a white wall. Emphasize evidence: multiple observations of the same pattern (red plastic always makes red light) proves the material causes the effect.

Question 11

Read about Emma. Clear plastic let bright white light through and she saw clearly. Red plastic made red light and she saw red. What did Emma learn about different materials?

All materials change light the same way, so everything beyond looks the same.
Clear and red plastic changed light differently, so what she saw beyond looked different. (correct answer)
Seeing clearly made the clear plastic, so the light stayed bright and white.
Red plastic made her hand red, but it did not change the light at all.

Explanation: This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: different materials have different effects on light - clear materials don't change color while colored materials do. Emma observed and compared two materials: Evidence collected: [Observation 1: clear plastic kept light white and view clear], [Observation 2: red plastic made light red and view red], [Observation 3: different materials had different effects]. For example, the clear plastic let white light through unchanged while red plastic filtered out other colors leaving only red. This shows that different material properties changed the light differently which changed visibility differently. The correct answer B says "Clear and red plastic changed light differently, so what she saw beyond looked different" which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that different plastics affected light differently, explains the materials' different properties caused different light changes, and this made views look different. This is a complete evidence-based explanation. Incorrect reasoning like "All materials change light the same way, so everything beyond looks the same" (A) is wrong because it claims the opposite of what Emma observed - she found clear and red plastic had very different effects on light and visibility. Students might choose this if they overgeneralize before testing different materials. Help students see the full causal chain with sentence frames: "Different materials have different properties → so light [changes differently] → which makes things beyond look [different]." Do demonstrations comparing materials: shine same white light through clear, red, blue, and frosted materials - observe different effects. Create data table showing material type → light change → what you see beyond.

Question 12

Jamal stacked yellow and blue cellophane and shined a flashlight. The light looked green and his paper looked green. How did the material change the light and what he saw?

The paper turned green first, so the light became green after.
The colored sheets made green light, so the paper beyond looked green too. (correct answer)
The sheets were smooth, so they blocked all light and made darkness.
The light changed to green, but it did not change what he saw.

Question 13

Carlos moved wax paper closer to the wall and farther away. Closer looked blurrier; farther looked a little clearer. What evidence shows wax paper changes light?

When wax paper was closer, light spread out more, so shapes beyond looked blurrier. (correct answer)
When it was closer, Carlos stood closer, so the wall looked blurrier.
Wax paper made the wall blurrier, but the light stayed bright and straight.
Wax paper is clear, so it made the wall brighter and sharper.

Explanation: This question tests 1st-PS4-3: investigating how distance affects light scattering by materials. When scattering materials are closer to a surface, the scattered light has less distance to spread, appearing blurrier. Carlos moved wax paper and observed: closer to the wall looked blurrier, farther away looked slightly clearer, showing how distance affects the scattering pattern. This demonstrates that wax paper scatters light, and the scattered light spreads more with distance, affecting clarity. The correct answer A states "When wax paper was closer, light spread out more, so shapes beyond looked blurrier" which correctly connects position → scattering effect → visibility change. Answer C incorrectly claims light stayed bright and straight despite the observed blurriness. To teach this, demonstrate moving wax paper closer and farther from a wall while shining light through it. Help students observe how the scattered light pattern changes with distance. This shows that materials don't just change light, but the effect can vary with position.

Question 14

Emma compared clear and red plastic with a flashlight. Clear stayed white and bright; red turned light red. How does colored plastic change what you can see beyond it?

Colored plastic makes red light, so things beyond can look red instead of normal. (correct answer)
Colored plastic makes things red, so the light turns red later.
Colored plastic blocks all light, so you see nothing beyond it.
You see red beyond it, but the light stayed white and bright.

Question 15

Read about Sofia. The mirror bounced flashlight light back in a bright beam. She could not see through the mirror. What evidence shows the mirror reflected light?

The mirror reflected light back, so she saw a bright beam and could not see beyond it. (correct answer)
She could not see beyond the mirror, so the mirror must have made the flashlight turn off.
The mirror made a bright beam, but it did not change what Sofia could see.
The mirror was shiny, but Sofia only looked at the wall, not the light.

Explanation: This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: mirrors reflect light back completely (we cannot see beyond, only reflections). Sofia observed mirror with flashlight: Evidence collected: [Observation 1: flashlight beam bounced back from mirror], [Observation 2: saw bright reflected beam], [Observation 3: could not see through mirror at all]. For example, the mirror's reflective surface sent all the flashlight light back toward Sofia instead of letting any pass through. This shows the material's reflective property changed the light by reflecting it which prevented any visibility beyond. The correct answer A says "The mirror reflected light back, so she saw a bright beam and could not see beyond it" which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that mirror reflected light back, explains the material's reflective property caused complete light reflection, and this made it impossible to see beyond. This is a complete evidence-based explanation. Incorrect reasoning like "She could not see beyond the mirror, so the mirror must have made the flashlight turn off" (B) is wrong because it misunderstands the cause - Sofia saw a bright reflected beam, so the flashlight was clearly still on; the mirror reflected light rather than turning it off. Students might choose this if they think "no view through = no light" without considering reflection. Help students see the full causal chain with sentence frames: "The material is [reflective] → so light [bounces back] → which makes things beyond [impossible to see]." Do demonstrations showing material → light change: shine flashlight at mirror at angle, trace path of reflected beam with hand. Compare to shining through glass - light continues forward vs bouncing back.

Question 16

Read Sofia's test: flashlight on mirror bounced back; wall did not. What did Sofia learn about how a mirror affects light?

The mirror reflected light back in a bright beam, so she saw a clear reflection, not through it. (correct answer)
The mirror let light pass through, so she could see behind it clearly.
The wall was white, so it made the mirror shiny and bright.
Light bounced because Sofia held the flashlight too close to the mirror.

Explanation: This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: mirrors and shiny surfaces reflect light back instead of letting it pass through, while non-shiny surfaces like walls absorb or scatter light without reflecting it back as a beam. Sofia observed a mirror and wall with flashlight. Evidence collected: light on mirror bounced back as a bright beam, light on wall did not bounce back, and she saw a clear reflection in the mirror but could not see through it. This shows the mirror's smooth, shiny property changed the light by reflecting it back, which changed visibility by showing a reflection instead of letting you see beyond. The correct answer says "The mirror reflected light back in a bright beam, so she saw a clear reflection, not through it" which correctly connects material property → light change → visibility effect using evidence. The answer explains that the mirror reflected light back (the cause), creating a bright beam and reflection, and preventing seeing through it - a complete explanation of how the material affects both light and visibility. Incorrect answers like "The mirror let light pass through, so she could see behind it clearly" are wrong because they describe the opposite of what mirrors do - mirrors reflect light, they don't let it pass through. Students might choose this if they confuse mirrors with clear materials like glass windows. Help students understand reflection with hands-on activities: shine flashlights at mirrors at different angles to see the reflected beam, compare to shining at paper or walls. Use comparisons: "Clear glass lets light through → see beyond; Mirror reflects light back → see reflection, not beyond." Emphasize the evidence: the bouncing light beam proves reflection is happening.

Question 17

Sofia tested a mirror and a wall with a flashlight. Mirror bounced light back bright; wall spread light softly. What is the evidence that different materials change light in different ways?

The wall reflected a bright beam, so she saw a clear reflection in it.
The mirror bounced light back, but the wall spread it, so light looked different. (correct answer)
She could not see through either one, so both changed light the same way.
The flashlight was bright, so the mirror and wall both made bright spots.

Explanation: This question assesses 1st-PS4-3: comparing how different materials affect light differently. Materials with different surface properties change light in distinct ways - mirrors reflect, walls scatter. Sofia tested both materials with a flashlight and observed: the mirror bounced light back as a bright beam, the wall spread light softly, showing different materials affect light differently. This demonstrates that smooth, shiny surfaces reflect light directionally while rough surfaces scatter it in many directions. The correct answer B states "The mirror bounced light back, but the wall spread it, so light looked different" which correctly identifies the different effects of each material on light. Answer C incorrectly claims both materials changed light the same way. Help students investigate various materials to see patterns: shiny/smooth materials reflect, rough materials scatter, clear materials transmit. Use side-by-side comparisons to highlight how material properties determine their effect on light. This builds understanding that we can predict light behavior based on material properties.

Question 18

Sofia tested a mirror and a wall with a flashlight. Mirror bounced light back bright; wall spread light softly. What is the evidence that different materials change light in different ways?

The wall reflected a bright beam, so she saw a clear reflection in it.
The mirror bounced light back, but the wall spread it, so light looked different. (correct answer)
She could not see through either one, so both changed light the same way.
The flashlight was bright, so the mirror and wall both made bright spots.

Question 19

Sofia shined a flashlight: wall spread light; mirror bounced it back bright. Which observation proves the mirror changed light?

The mirror let light pass through, so she saw behind it clearly.
The mirror bounced light back as a bright beam, so she saw a reflection, not through it. (correct answer)
The wall was white, so it made a bright beam bounce back.
She could not see through the mirror, but the light did not change.

Explanation: This question tests 1st-PS4-3: determining how materials affect light through investigation. Mirrors reflect light back rather than letting it pass through, creating reflections instead of allowing visibility beyond. Sofia observed a mirror with a flashlight and collected evidence: the wall spread light softly, the mirror bounced light back as a bright beam, and she saw a reflection rather than seeing through the mirror. This shows the mirror's smooth, reflective surface bounced light back instead of letting it pass through. The correct answer B states "The mirror bounced light back as a bright beam, so she saw a reflection, not through it" which correctly connects the mirror's property → light reflection → seeing reflection not through. Answer A incorrectly claims mirrors let light pass through. To teach this concept, demonstrate with a flashlight and mirror how light bounces back, creating a bright spot where it reflects. Compare this to shining light on a wall which spreads it softly. Emphasize that mirrors change light's direction by reflecting it back.

Question 20

Read Yuki's test: aluminum foil in front of a lamp blocked light; a mirror bounced light. What is the evidence that shiny materials can reflect light?

The mirror sent a bright beam back, so the shiny surface reflected light instead of letting it through. (correct answer)
The foil was crinkly, so it made the lamp turn off and on.
Yuki could not see through the mirror, so the mirror must be clear.
Light was bright, but no material was placed in front of the lamp.

Explanation: This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: shiny smooth surfaces like mirrors and polished metal reflect light back as a beam, while dull or crinkled surfaces may block or scatter light without creating a directed reflection. Yuki observed aluminum foil and a mirror with lamp light. Evidence collected: aluminum foil blocked light (no light passed through), mirror bounced light back as a bright beam, and both materials were shiny but behaved differently due to surface smoothness. This shows that shiny smooth surfaces reflect light in a directed way, while crinkled shiny surfaces may just block light. The correct answer says "The mirror sent a bright beam back, so the shiny surface reflected light instead of letting it through" which correctly connects material property → light change → visibility effect using evidence. The answer identifies the shiny surface as the key property for reflection, explains it sent light back as a beam rather than letting it through - showing understanding of how surface properties determine light behavior. Incorrect answers like "The foil was crinkly, so it made the lamp turn off and on" are wrong because they invent impossible effects - materials can't turn lamps on and off, they can only change how light travels. Students might choose this if they don't understand how materials interact with light. Help students compare surface effects: shine light on smooth foil vs crinkled foil vs mirror to see how surface texture affects reflection quality. Use investigations: test various shiny materials (spoon, CD, polished metal) to find the pattern that smooth shiny surfaces create clear reflections. Emphasize evidence: the bright reflected beam proves light is bouncing back, not passing through or being absorbed.