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Question
The steel used for making rock drills and safes is ______.
Options
stainless steel
nickel steel
invar
manganese steel
MCQ
Fill in the Blanks
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Solution
The steel used for making rock drills and safes is manganese steel.
Explanation:
Manganese steel is very hard, tough, and wear‑resistant, so it is used for rock drills, safes, prison bars, and armour plates.
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