Science Year 4 Unit 6: Sound

What causes sound to be produced?

• Vibrations

• Light

• Heat

• Electricity

Through which medium does sound travel the fastest?

• Solids

• Liquids

• Gases

• Vacuum

What is the process called when sound waves bounce back after hitting a surface?

• Reflection

• Refraction

• Diffraction

• Absorption

Which technology uses the principle of sound reflection to detect objects underwater?

• Sonar

• Radar

• Lidar

• GPS

What is an example of a harmful sound mentioned in the passage?

• Loud traffic noise

• Music

• Gentle breeze

• Birds chirping