Echo Explorers

Froggy Jumps

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Sound reflections for grade 5

Omar Rakha

Saudi Arabia

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Echo Explorers


Froggy Jumps Echo ExplorersVersion en ligne Sound reflections for grade 5 par Omar Rakha 1 What is the reflection of sound that you hear after it bounces off a surface called? a Wave b Echo c Noise 2 Which surface conducts echoes best for a clear sound? a Water with waves b Hard, smooth surfaces like rock or metal c Soft, fluffy carpets 3 Which of these is NOT a use of echoes or sound reflection? a Stadium sound checks b Sonar for submarines c Creating silent zones 4 What device uses echoes to measure distance underwater? a Thermometer b Microscope c Sonar 5 Why might you hear an unwanted echo in a large empty room? a The air is too cold b Sound bounces between walls multiple times c The room vibrates slowly 6 Which factor makes echoes clearer: distance or angle of the surface? a Color of the walls b Room temperature c Angle and surface type 7 Which best helps reduce an unwanted echo in a classroom? a Add soft materials like carpets and curtains b Paint walls glossy c Use louder projectors 8 Which term describes the time delay between a sound and its echo? a Amplitude b Time delay or latency c Frequency 9 Which use of echoes helps bats and dolphins navigate? a Echolocation b Helicopter navigation c Photosynthesis 10 If you shout in a canyon and hear the echo quickly, what does this say about the distance? a The distance to the canyon wall is short b The sound is muted c The canyon is very wide