Grade 4 Science: Unit 3 Test: Waves and
Information Transfer 2023
A student makes four different sounds. Which sound has the most energy? - ANSWER-The sounds with
the loudest volume will have the most energy and the wave with the largest amplitude.
Which statement describes a wave? - ANSWER-Water moves up and down when it is disturbed.
A student sends the text message "Hi." The cell phone turns the message into binary code. How are the
H and the I different in binary code? - ANSWER-Each letter is coded as a different pattern of 1s and 0s.
A science class wants to make a model of waves. Which sentence describes the best model? - ANSWER-
Attach one end of a long rope to a wall, and shake the rope up and down.
How do cell phones receive decoded information over long distances? - ANSWER-They receive digitized
information and change it to voice.
Which sentence correctly compares Morse and binary codes? - ANSWER-Morse code and binary code
use patterns to represent letters in a written message.
A student looks at a flower. She can see the flower because light from the------------------------. - ANSWER-
sun
The sun reflects -----------------the flower and -------------- - ANSWER-off, into her eyes
Jane wants an electronic device that meets the criteria shown in the table.Choose the correct criteria for
each device that meets the criterion.
A. easy to carry in coat pocket
B. can be used to read messages in the dark
C. sends and receives messages - ANSWER-A. cell phone, radio, head phones
Information Transfer 2023
A student makes four different sounds. Which sound has the most energy? - ANSWER-The sounds with
the loudest volume will have the most energy and the wave with the largest amplitude.
Which statement describes a wave? - ANSWER-Water moves up and down when it is disturbed.
A student sends the text message "Hi." The cell phone turns the message into binary code. How are the
H and the I different in binary code? - ANSWER-Each letter is coded as a different pattern of 1s and 0s.
A science class wants to make a model of waves. Which sentence describes the best model? - ANSWER-
Attach one end of a long rope to a wall, and shake the rope up and down.
How do cell phones receive decoded information over long distances? - ANSWER-They receive digitized
information and change it to voice.
Which sentence correctly compares Morse and binary codes? - ANSWER-Morse code and binary code
use patterns to represent letters in a written message.
A student looks at a flower. She can see the flower because light from the------------------------. - ANSWER-
sun
The sun reflects -----------------the flower and -------------- - ANSWER-off, into her eyes
Jane wants an electronic device that meets the criteria shown in the table.Choose the correct criteria for
each device that meets the criterion.
A. easy to carry in coat pocket
B. can be used to read messages in the dark
C. sends and receives messages - ANSWER-A. cell phone, radio, head phones
