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Electricity, Magnetism, Light & Sound

Grade 2 · On-level practice · 8 questions · Version PG-612DQO-KW5O

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

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

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.