Chapter 9: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 9
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MCQ 26: Due to constant heat and pressure, buried plants turn in to
MCQ 27: Living things are source of
MCQ 28: Atomic number of 'Zinc' is
MCQ 29: The need and demand of fossils fuel can be reduced by
MCQ 30: Toxic air pollutants like sulphur dioxide and nitrogen oxides are produced by burning
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