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Electricity, Magnetism, Light & Sound

Grade 3 · On-level practice · 8 questions · Version PG-FCZ9AQ-JMEH

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1.What can happen when light enters water?
2.What energy change occurs in a speaker?
3.Why does a shadow form?
4.What does a switch control?
5.Why can you hear an echo?
6.Name a good electrical conductor.
7.How do you see an object?
8.What do opposite magnetic poles do?

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 15
  1. What can happen when light enters water?It refracts, or bends
  2. What energy change occurs in a speaker?Electrical energy becomes sound
  3. Why does a shadow form?An object blocks light
  4. What does a switch control?Whether a circuit is open or closed
  5. Why can you hear an echo?Sound reflects from a surface
  6. Name a good electrical conductor.Copper
  7. How do you see an object?Reflected light enters your eyes
  8. What do opposite magnetic poles do?Attract

Worked example

Use a model to track energy, forces, and waves through a system.

Common mistake

Assuming energy travels without a path or medium.

Helpful hint

Draw the source, path, interaction, and result.