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Electricity, Magnetism, Light & Sound

Grade 2 · On-level practice · 8 questions · Version PG-PPZG1B-KW5O

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

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 17
  1. What can happen when light enters water?It refracts, or bends
  2. How do you see an object?Reflected light enters your eyes
  3. What do opposite magnetic poles do?Attract
  4. Name a good electrical conductor.Copper
  5. What energy change occurs in a speaker?Electrical energy becomes sound
  6. What does a switch control?Whether a circuit is open or closed
  7. Why does a shadow form?An object blocks light
  8. Why can you hear an echo?Sound reflects from a surface

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.