Only When the Light Falls On It is a free printable Grade 1 science worksheet on evidence that objects can be seen only when lit, aligned to NGSS performance expectation 1-PS4-2. It prints 8 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.
Set 1 of 25 · the same problems every time you open this link.
1.Two children look into the same dark box. What do they both see?
A.The box's color
B.Different things
C.Nothing, because there is no light in it
2.Why can you see the moon at night?
A.It is close to us
B.It makes its own light
C.Sunlight falls on it
3.Which of these can be seen in a completely dark room?
A.Nothing at all
B.Anything large
C.Anything white
4.You shine a flashlight into the box. Why can you see the toy now?
A.Light falls on it and reaches your eye
B.The flashlight makes the toy bigger
C.The toy starts glowing on its own
5.What do you need before you can see anything at all?
A.Warmth
B.Quiet
C.Light falling on it
6.A toy is in a closed box with no light. Why can you not see it?
A.No light is falling on it
B.It has moved away
C.It has changed color
7.You open the curtains in a dark room. Why can you see the furniture?
A.The furniture wakes up
B.Daylight now falls on it
C.The curtains make light
8.A cat's eyes seem to shine in a car's headlights. What is happening?
A.The eyes make their own light
B.The eyes are hot
C.Light from the headlights is bouncing off them
LessonPrint · 1-PS4-2 · Set 1 · free to copy for classroom use
Answer key — Only When the Light Falls On It
Set 1. Prints on its own sheet.
1.Nothing, because there is no light in it
2.Sunlight falls on it
3.Nothing at all
4.Light falls on it and reaches your eye
5.Light falling on it
6.No light is falling on it
7.Daylight now falls on it
8.Light from the headlights is bouncing off them
Questions about Only When the Light Falls On It
What does the Only When the Light Falls On It worksheet cover?
It practices evidence that objects can be seen only when lit — 8 questions for Grade 1, all on NGSS 1-PS4-2: Show that you can only see an object when light falls on it. The instruction to students is “Circle the best answer”, and the answer key follows on the next sheet.
Which NGSS performance expectation does Only When the Light Falls On It practice?
1-PS4-2, under Physical Science for Grade 1. The published performance expectation reads: “Make observations to construct an evidence-based account that objects can be seen only when illuminated.” The worksheet assesses that performance expectation rather than a paraphrase of it.
What age or grade is this worksheet for?
Only When the Light Falls On It is written for Grade 1, typically ages 6-7. It is one of the sheets on 1-PS4-2, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.
Does Only When the Light Falls On It come with an answer key?
Yes. All 8 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.
How many different versions of Only When the Light Falls On It can I print?
25 — one per student, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.
Is Only When the Light Falls On It free to print and photocopy?
Yes. Only When the Light Falls On It, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.
Is there a lesson plan to teach 1-PS4-2?
Yes — “Only When the Light Falls On It” is a 50-minute Grade 1 plan for 1-PS4-2, timed section by section, with the misconceptions to expect and an exit ticket. Only When the Light Falls On It is the practice that follows it.
More practice for 1-PS4-2
Show that you can only see an object when light falls on it.