This question assesses the skill 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Codes or patterns give signals meaning: one flash = message A, two flashes = message B. Devices work over distance when talking does not work. People agree on code beforehand so everyone knows what signals mean. Jamal built a dinner bell to solve the problem of signaling dinner time from a distance. Materials used: bell, string. Build process: tied string to bell for pulling. The device uses sound to send signals. Code: 1 ring means come here, 2 rings means yes, 3 rings means dinner now. When Jamal rings 3 times, the receiver hears and knows it means dinner now. The correct answer says "Jamal built a bell signal using string that 3 rings means dinner now." which accurately describes the specific signal code for dinner now and how the device solves the problem. This shows understanding that the device uses sound signals, has a code/pattern system, and solves the problem of distance/barrier communication. The device successfully sends simple messages without talking. A distractor like "Jamal built a bell signal using string that 3 rings means 5 minutes." is wrong because it claims wrong code meanings (5 minutes instead of dinner now). Students might choose this if they confuse light and sound signals, do not understand code system, focus on building materials not communication function, miss connection between device and problem it solves. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Let students build simple devices: flashlight with agreed flashes, bell with ring patterns. Practice sender-receiver: one student sends code signal, other interprets - did message get through correctly? Discuss why light or sound chosen: light works for line-of-sight over distance, sound works through barriers and in noisy places. Connect to real examples: traffic lights (light signals), school bells (sound signals), referee whistles (sound codes). Watch for: students who build something but do not establish clear code system, or who do not test if receiver understands the signals.

This question tests understanding of 1st-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Codes or patterns give signals meaning: one flash = message A, two flashes = message B. Emma built a flashlight code to solve communicating over distance. Materials used: flashlights. Build process: created flash patterns with specific meanings. The device uses LIGHT to send signals. Code: 2 flashes = yes. When Emma flashes twice, the receiver can see it from a distance and knows it means "yes". The correct answer says "Emma built a flashlight code where 2 flashes mean yes" which accurately describes the specific signal code Emma established. This shows understanding that the device uses light signals, has a pattern system where 2 flashes = yes, and solves the problem of distance communication. The device successfully sends simple messages without talking. Wrong code meanings like "Emma built a flashlight code where 2 flashes mean come here" are wrong because they assign the wrong meaning to the 2-flash signal. Students might choose this if they don't carefully read what Emma's specific code means, or if they confuse different possible meanings for the same signal pattern. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Let students build simple devices: flashlight with agreed flashes, bell with ring patterns. Practice sender-receiver: one student sends code signal, other interprets - did message get through correctly? Connect to real examples: traffic lights use specific light patterns where each color has agreed meaning.

This question tests understanding of 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Devices work over distance when talking does not work. Jamal built a dinner bell to solve the problem of calling someone for dinner from a distance. Materials used: bell, string, and tape. Build process: Jamal attached a bell to string using tape to create a device that can be rung. The device uses SOUND to send signals. Code: ringing the bell signals dinner time. When Jamal rings the bell, family members can hear it from other rooms or outside and know it's time to come eat. The correct answer says "Jamal built a bell on string using tape that sends sound to tell dinner time" which accurately describes that the device uses sound signals (a bell makes sound when rung) and solves the problem of announcing dinner time across distance. This shows understanding that bells create sound signals. The device successfully sends the dinner message without yelling. Distractors like "flashlight code" or "flag system" are wrong because they claim Jamal's device uses light when a bell clearly produces sound, not light. Students might choose these if they confuse light and sound signals or don't understand that bells make sound. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Let students explore different devices: bells make sound, flashlights make light. Discuss why sound chosen for dinner bell: sound travels through walls and around corners, so people inside different rooms can hear it. Connect to real examples: school bells (sound signals), dinner bells on farms (sound to call workers from fields).

This question tests understanding of 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. The problem a device solves tells us why it was built and what special challenges it addresses. Understanding the environment helps explain device choices. Chen built a drum code to solve the problem of communicating in a noisy workshop. Materials used: drum and drumstick. Build process: Chen created a drum communication system specifically for a workshop environment where machines make lots of noise. The device uses SOUND to send signals. Problem solved: communicating important messages (like safety signals) in a noisy workshop where normal talking or quiet sounds wouldn't be heard over machine noise. When Chen hits the drum, the loud sound cuts through the workshop noise so workers can receive important messages despite the loud environment. The correct answer says "Chen built a drum code using a drumstick that sends sound in a noisy workshop" which accurately identifies the specific problem: needing to communicate where there's already lots of noise. This shows understanding that drums were chosen because they're loud enough to be heard over other sounds. The device successfully solves the noisy environment communication challenge. Distractors like "sends light in a dark bedroom" are wrong because drums make sound, not light, and the problem was noise, not darkness. Students might choose this if they confuse the type of signal (sound vs light) or don't understand why certain devices work better in certain environments. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Let students identify environment challenges: noisy places need loud sounds, dark places need bright lights, far distances need strong signals. Match devices to problems: workshop = drum, nighttime = flashlight. Discuss why sound chosen for noisy places: must be louder than background noise. Connect to real examples: factory horns (loud over machinery), emergency sirens (heard over traffic), fog horns (sound travels in fog better than light).

This question tests understanding of 1st-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Codes or patterns give signals meaning: specific whistle patterns = specific messages. Keisha built a whistle code to solve communicating during activities. Materials used: whistle. Build process: created whistle patterns with specific meanings. The device uses SOUND to send signals. Code: 2 short whistles = stop. When Keisha blows two short whistles, others can hear it and know to stop what they're doing. The correct answer says "Keisha built a whistle code where 2 short whistles mean stop" which accurately describes both the signal pattern (2 short whistles) and its meaning (stop). This shows understanding that the device uses sound signals, has a specific code where 2 short whistles = stop, and solves the problem of giving commands over distance. The device successfully sends clear action messages. Wrong patterns like "Keisha built a whistle code where 3 whistles mean stop" are wrong because they describe a different number of whistles than Keisha's actual code. Students might choose this if they don't pay attention to the specific number of whistles, or if they think more whistles would be better for important messages like "stop". When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Practice whistle patterns: short vs long, different numbers. Discuss why whistles work well: sharp sound carries far, works in many environments. Connect to real examples: referee whistles, lifeguard whistles, coach whistles. Watch for: students who confuse pattern details like number of whistles or don't establish clear meanings.

This question tests understanding of 1st-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Codes or patterns give signals meaning: specific tap patterns = specific messages. Chen built a drum code to solve communicating in a noisy workshop. Materials used: drum. Build process: created drumming patterns with specific meanings. The device uses SOUND to send signals. Code: 3 fast taps = stop machines. When Chen taps three times quickly, workers can hear it over machine noise and know to stop machines immediately. The correct answer says "Chen built a drum code where 3 fast taps mean stop machines" which accurately describes both the signal pattern (3 fast taps) and its meaning (stop machines). This shows understanding that the device uses sound signals loud enough to hear over noise, has a specific code system, and solves the problem of workshop safety communication. The device successfully sends urgent messages in noisy environments. Wrong patterns like "Chen built a drum code where 5 slow taps mean stop machines" are wrong because they describe a different signal pattern than Chen actually used. Students might choose this if they don't pay attention to the specific number and speed of taps, or if they think longer signals are better for important messages. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Discuss why sound chosen for noisy places: drums are loud enough to hear over other sounds. Practice different drum patterns: fast vs slow, different numbers of taps. Connect to real examples: fire alarms (loud sound signals), factory whistles. Watch for: students who confuse pattern details like number of taps or speed.

This question tests understanding of 1st-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Light signals work well when you have line-of-sight over distance. Marcus's teacher built a light board to solve communicating from playground to classroom. Materials used: lights, switches, board. Build process: mounted lights in window visible from playground. The device uses LIGHT to send signals. Code: different light patterns mean different messages. When the teacher activates lights, students on playground can see the flashing lights in the window and know what message is being sent. The correct answer says "Marcus's teacher built a light board that flashes lights in the window" which accurately describes how the device sends messages using flashing lights visible through the window. This shows understanding that the device uses light signals that can be seen from a distance, solving the problem of playground-to-classroom communication. The device successfully sends messages without voice. Wrong signal types like "Marcus's teacher built a bell board that rings from the playground" are wrong because they describe sound devices when the teacher actually used light. Students might choose this if they confuse light and sound signals, or don't understand that a "light board" specifically uses lights not sounds. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Discuss why light chosen: light works well for line-of-sight communication across open spaces like playgrounds. Let students experiment: can you see a flashlight from across the playground? Connect to real examples: lighthouse signals, airplane runway lights. Watch for: students who think all school signals must be sound-based like bells.

This question tests understanding of 1st-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Light signals work when you can see them across distance. Sofia built bright flags to solve communicating across yards. Materials used: bright colored flags. Build process: created visible flag signals. The device uses LIGHT (visual signals) to send messages. The bright colors make flags easy to see from far away. When Sofia waves or positions the flags, her friend across the yard can see the visual signal and understand the message. The correct answer says "Sofia built bright flags that use light to signal across the yard" which accurately describes that flags are visual/light-based signals that work across yard distances. This shows understanding that flags work by reflecting light to create visible signals, solving the problem of yard-to-yard communication. The device successfully uses visual communication. Wrong signal types like "Sofia built bright flags that use sound to ring across the yard" are wrong because flags create visual signals not sound signals. Students might choose this if they don't understand that flags are seen not heard, or if they confuse how different devices work. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Discuss how flags work: we see them because light bounces off the bright colors. Let students test: can you see a small flag vs big flag from far away? why are bright colors better? Connect to real examples: construction flags, racing flags, country flags. Watch for: students who think flags make noise or who don't understand that seeing something means using light.

This question tests understanding of 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Codes or patterns give signals meaning: different numbers of rings can mean different things. Jamal built a dinner bell to solve the problem of calling family for meals. Materials used: bell, string, and tape. Build process: Jamal attached a bell to string using tape to create a device that can be rung different numbers of times. The device uses SOUND to send signals. Code: 3 rings = dinner now. When Jamal rings the bell three times, family members can hear it and know dinner is ready immediately. The correct answer says "Jamal built a bell on string using tape that sends sound; 3 rings mean dinner now" which accurately describes that the device uses sound signals, has a specific code (3 rings = dinner now), and solves the problem of announcing immediate dinner time. This shows understanding that different ring patterns can mean different things. The device successfully sends time-specific dinner messages. Distractors like "3 rings mean 5 minutes" or "2 rings mean dinner now" are wrong because they either assign the wrong meaning to 3 rings or use the wrong number of rings for the immediate dinner signal. Students might choose these if they don't carefully read Jamal's specific code or if they confuse the number of rings with the meaning. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Let students create multi-signal codes: 1 ring = 10 minutes, 2 rings = 5 minutes, 3 rings = now. Practice listening and counting rings. Discuss why different patterns useful: can send different levels of urgency. Connect to real examples: school bells (different patterns for different times), church bells (number of rings tells time).

This question assesses the skill 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - building device part. A communication device is a tool that helps send messages. Simple devices use light (flashlights, flags, blinking lights) or sound (bells, whistles, drums) to send signals. Codes or patterns give signals meaning: one flash = message A, two flashes = message B. Devices work over distance when talking does not work. People agree on code beforehand so everyone knows what signals mean. Emma built a flashlight code device to solve the problem of communicating between different rooms. Materials used: 2 flashlights, paper, markers, tape. Build process: they assembled the flashlights with labeled codes on paper taped on. The device uses light to send signals. Code: 1 flash=come here, 2 flashes=yes, 3 flashes=no. When Emma flashes twice, the receiver can see it from another room and knows it means yes. The correct answer says "Emma built a flashlight code using light that flashes twice to mean yes" which accurately describes the device uses light signals, specific signal code with two flashes meaning yes, materials used, and how the device solves the problem of distance communication. This shows understanding that the device uses light signals, has a code/pattern system, and solves the problem of room-to-room communication. The device successfully sends simple messages without talking. An error type like "Emma built a flashlight code using light that flashes twice to mean come here" is wrong because it claims the wrong code meaning (says come here when it's actually yes for two flashes). Students might choose this if they confuse the code system or do not carefully read the meanings. When building communication devices, emphasize three parts: (1) Signal method (light or sound? why this choice for this problem?), (2) Code (what does each signal mean? must agree beforehand), (3) Test (does receiver understand message?). Let students build simple devices: flashlight with agreed flashes, bell with ring patterns. Practice sender-receiver: one student sends code signal, other interprets - did message get through correctly? Discuss why light or sound chosen: light works for line-of-sight over distance, sound works through barriers and in noisy places. Connect to real examples: traffic lights (light signals), school bells (sound signals), referee whistles (sound codes). Watch for: students who build something but do not establish clear code system, or who do not test if receiver understands the signals.