Design Information Transfer

Grade 4 Science Worksheet

Circle the answer.

1. 1.

   A class tests a sound code with 10 messages. Partners decode 9 correctly, but mix up "left" and "lift" patterns. What is the best next step?

   • keep the code as it is
   • make the left and lift patterns more different
   • remove the code key
   • make all patterns the same length and sound
2. 2.

   Code: 1 flash = 1, 2 flashes = 2, long flash = 5. What number is long, flash, flash?

   • 7
   • 5
   • 3
   • 52
3. 3.

   A code uses 1 flash for A, 2 flashes for B and 3 flashes for C. The receiver keeps mixing up B and C. What is the best fix?

   • add a long pause after each letter
   • remove the code key
   • use one flash for every letter
   • flash faster so it takes less time
4. 4.

   Code: thumb up = yes, thumb down = no. A friend points a thumb down. What is the answer?

   • later
   • no
   • maybe
   • yes
5. 5.

   Code: 2 beeps = door open, 4 beeps = door closed. Lee hears 4 beeps. What does it mean?

   • the door is locked
   • the door is closed
   • the alarm is broken
   • the door is open