Class 7 Science MCQs (Grade 7) From Textbook

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Class 7 Science MCQs – Certification Test 210

Sound Waves and Noise MCQs (Question 210) – App & e-Book Download

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MCQ: 210

20 dB has hundred times more energy than

  1. 10 dB
  2. 0 dB
  3. 5 dB
  4. 2 dB

Sound Waves and Noise Cerification Guide – Class 7 Science App & e-Book MCQs

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Sound Waves and Noise MCQs Apps (iOS & Android)

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7th Grade Science MCQs Apps (Android & iOS)

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