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Massachusetts Comprehensive Assessment System

2013, Grade 8 Science and Technology/Engineering

  Question 10: Open-Response  
The diagram below shows how computers can record, store, and play back music.
Series of labeled pictures arranged in two rows. Top row has the following pictures from left to right: a trumpet, with lines for music (sound) coming out of it towards the right; a microphone pointing left towards the trumpet, with the label Converts sound into electrical signals; and a computer with the labels Computer 1 and Converts electrical signals into digital information and stores it. Bottom row has the following pictures from left to right: a computer with the labels Computer 2 and Converts digital information into electrical signals; and a speaker, with lines for sound (music) coming out of it towards the right and the label Converts electrical signals into sound.
  1. Identify one step in this process where information is encoded.
  2. Identify one step in this process where information is decoded.
  3. Describe one reason why sound from the trumpet must be converted into electrical signals before the information can be stored in the computer’s memory.
  4. Describe one way that digital information stored on computer 1 can be transmitted to computer 2.

Scoring Guide and Sample Student Work
Select a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of the components of a communication system. The response correctly identifies one step in the process where information is encoded and one step where it is decoded. The response clearly describes one reason why sound from the trumpet must be converted into electrical signals before the information can be stored in the computer’s memory and clearly describes one way that digital information stored on computer 1 can be transmitted to computer 2.
4
3
The response demonstrates a general understanding of the components of a communication system.
2
The response demonstrates a limited understanding of the components of a communication system.
1
The response demonstrates a minimal understanding of the components of a communication system.
0 Response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

Grade 8 Science and Technology/Engineering

Question 9: Earth and Space Science
Question 10: Technology/Engineering

Return to the MCAS 2013 Student Work Directory



Last Updated: June 28, 2016
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