27. Which of the following has a negative temperature co-etficient
(A) Carbon (B) Iron (O) Manganese (D) Silver
-निम्नांकित में से किसमें निगेटिव ताप गुणांक होता है ?
(A) कार्बन (B) लोहा (0) मैंगनीज (D) जाँदी
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the answer is carbon so option A is correct
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