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Electricity, Magnetism, Light & Sound

Grade 2 · On-level practice · 8 questions · Version PG-OC1FKG-KW5O

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

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 12
  1. What happens to pitch as frequency rises?Pitch becomes higher
  2. Why does a shadow form?An object blocks light
  3. How do you see an object?Reflected light enters your eyes
  4. Why can you hear an echo?Sound reflects from a surface
  5. What can happen when light enters water?It refracts, or bends
  6. What do like magnetic poles do?Repel
  7. What energy change occurs in a speaker?Electrical energy becomes sound
  8. What does a switch control?Whether a circuit is open or closed

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.