Class 7 Science MCQs – Certification Test 659

Sound Waves and Echoes MCQ (Question 659) – App & e-Book Download

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MCQ 659: Some fishing boats use echo to:

calculate the depth of water
detect any predator
detect shoal of fish
eggs of fish

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The "Sound Waves and Echoes Learning " App: Free 7th Grade Science MCQ App Download (Android & iOS) to study scientific method. Download App Store & Play Store Study Apps with all functionalities for science academic growth programs.