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Class 7 Science MCQs – Certification Test 456

Sound Waves and Noise Quiz (Question 456) – Learning App & e-Book Download

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MCQ 456: The normal value of decibel that our ears can detect is:

  1. -20
  2. 0
  3. 20
  4. 40
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Sound Waves and Noise Quiz App & e-Book – Class 7 Science Exam Prep

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