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Electricity, Magnetism, Light & Sound

Grade 2 · On-level practice · 8 questions · Version PG-6B1ZFN-KW5O

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