20.Write down any four ways to prevent Rusting of Iron articles.
21. Given below is a sequence of steps in the processing of wool. Which are the
missing steps? Add them.
Shearing, __________, sorting, __________, __________, _________.
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20. 9 Ways to Prevent Rust
Use an Alloy. Many outdoor structures, like this bridge, are made from COR-TEN steel to reduce the effects of rust. ...
Apply Oil. ...
Apply a Dry Coating. ...
Paint the Metal. ...
Store Properly. ...
Galvanize. ...
Blueing. ...
Powder Coating
21. the missing steps are - Scouring, fiber spinning, dying and rolling into silk yarn.
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