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Electricity, Magnetism, Light & Sound

Grade 4 · On-level practice · 8 questions · Version PG-1NMX8VP-IE4M

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1.What is the electromagnetic spectrum?
2.Why does a shadow form?
3.What does a switch control?
4.Why can you hear an echo?
5.What affects electromagnet strength?
6.What energy change occurs in a speaker?
7.Why are parallel circuit branches useful?
8.What can happen when light enters water?

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 is the electromagnetic spectrum?The full range of electromagnetic waves
  2. Why does a shadow form?An object blocks light
  3. What does a switch control?Whether a circuit is open or closed
  4. Why can you hear an echo?Sound reflects from a surface
  5. What affects electromagnet strength?Current, coil turns, and core material
  6. What energy change occurs in a speaker?Electrical energy becomes sound
  7. Why are parallel circuit branches useful?Each branch can operate independently
  8. What can happen when light enters water?It refracts, or bends

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.