If 1 cubic cm of cast iron weights 21 gm, then the weight of a cast ir – McqOptions

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1.	If 1 cubic cm of cast iron weights 21 gm, then the weight of a cast iron pipe of length 1 m with a bore of 3 cm and in which the thickness of the metal is 1 cm, is ?
A.	21 kg
B.	24.2 kg
C.	26.4 kg
D.	18.6 kg
Answer» D. 18.6 kg

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