Which of the following statements about the use of radioactive isotopes is correct?

A.  In medicine, they are used as tracers for diagnostic purposes

B.  In industry, they are used to detect leak in water, oil and gas pipelines

C.  They are used to determine the age of rocks and fossils

D.  All of these statements are correct

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The raw material used for the manufacture of the Glass and is cement is :

A    Clay B    Gypsum C    Washing soda D    Limestone