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Electricity, Magnetism, Light & Sound

Grade 3 · On-level practice · 8 questions · Version PG-18HAXCV-JMEH

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

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.