Design Information Transfer

Grade 4 Science Worksheet - Challenge Me

Circle the answer.

1. 1.

   Two codes both work in tests. Code X takes 5 seconds per message; Code Y takes 15. Errors are the same. Which is better for an emergency?

   • neither, because they both work
   • Code X, because it is faster with no more errors
   • Code Y, because it has more errors
   • Code Y, because longer messages are safer
2. 2.

   A class makes a sound code for a noisy gym. Which change would help most?

   • use quiet taps but make them faster
   • send the code from another room
   • use a loud whistle instead of quiet taps
   • use more patterns that sound alike
3. 3.

   Code: 2 short = yes, 3 short = no. The receiver often confuses them. Which new code is clearer?

   • short = yes, long = no
   • 2 short = yes, 2 short = no
   • 4 short = yes, 5 short = no
   • 3 short = yes, 3 short = no
4. 4.

   Two scouts use mirrors to flash sunlight as signals. When will this design not work?

   • on a sunny day
   • in the morning sun
   • on a cloudy day
   • when they are far apart in the open
5. 5.

   A team's light code works in the classroom but fails outside at noon. What is the most likely reason?

   • the code key changed outside
   • the flashlight is hard to see in bright sunlight
   • the receiver is closer outside
   • light cannot travel outside