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Electricity, Magnetism, Light & Sound

Grade 4 · On-level practice · 8 questions · Version PG-P5F4KF-IE4M

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1.What energy change occurs in a speaker?
2.What affects electromagnet strength?
3.Why does sound travel faster in solids?
4.Why does a shadow form?
5.What can happen when light enters water?
6.Why can you hear an echo?
7.Why are parallel circuit branches useful?
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 15
  1. What energy change occurs in a speaker?Electrical energy becomes sound
  2. What affects electromagnet strength?Current, coil turns, and core material
  3. Why does sound travel faster in solids?Close particles transfer vibrations quickly
  4. Why does a shadow form?An object blocks light
  5. What can happen when light enters water?It refracts, or bends
  6. Why can you hear an echo?Sound reflects from a surface
  7. Why are parallel circuit branches useful?Each branch can operate independently
  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.