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Electricity, Magnetism, Light & Sound

Grade 2 · On-level practice · 8 questions · Version PG-9WWTGA-KW5O

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1.Name a good electrical conductor.
2.How do you see an object?
3.What energy change occurs in a speaker?
4.What does a switch control?
5.What happens to pitch as frequency rises?
6.Why does a shadow form?
7.Why can you hear an echo?
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 9
  1. Name a good electrical conductor.Copper
  2. How do you see an object?Reflected light enters your eyes
  3. What energy change occurs in a speaker?Electrical energy becomes sound
  4. What does a switch control?Whether a circuit is open or closed
  5. What happens to pitch as frequency rises?Pitch becomes higher
  6. Why does a shadow form?An object blocks light
  7. Why can you hear an echo?Sound reflects from a surface
  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.