Materials and Construction
Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2.

Acetic acid
None of these
Dilute HCI
Concentrated H₂SO₄

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Materials and Construction
Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)?

High frequency transformers
Induction motors
Generators and small motors
Armature of small motors/generators

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