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Electricity, Magnetism, Light & Sound

Grade 2 · On-level practice · 8 questions · Version PG-R3XGI6-KW5O

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1.How do you see an object?
2.What happens to pitch as frequency rises?
3.What can happen when light enters water?
4.Why can you hear an echo?
5.Name a good electrical conductor.
6.What energy change occurs in a speaker?
7.What does a switch control?
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 18
  1. How do you see an object?Reflected light enters your eyes
  2. What happens to pitch as frequency rises?Pitch becomes higher
  3. What can happen when light enters water?It refracts, or bends
  4. Why can you hear an echo?Sound reflects from a surface
  5. Name a good electrical conductor.Copper
  6. What energy change occurs in a speaker?Electrical energy becomes sound
  7. What does a switch control?Whether a circuit is open or closed
  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.