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Q25) The composition of the common glass is [ HAriyana CEET 1991]




SOLUTION


Answer: (a)


Q26) The material used in solar cells contains... [ IIT 1993]




SOLUTION


Answer: (b)


Q27) Method used for obtaining highly pure silicon used as semiconductor material is [ CBSE PMT 1994]



SOLUTION


Answer:(d)



Q28) galina is an ore of ... [ Pb. CET 1989]



SOLUTION


Answer: (b)


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