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Electricity, Magnetism, Light & Sound

Grade 4 · On-level practice · 8 questions · Version PG-1N2Y1HR-IE4M

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

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

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.