Chapter 12: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 12
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MCQ 71: The loss of heat in winter is a major waste of
MCQ 72: Low 'infrared waves'
MCQ 73: Electric companies use thermal imaging camera to identify
MCQ 74: At night, the convection current of land and sea
MCQ 75: When heating element from cooker is turned out, at first it emits
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