11. A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is
12. A steel containing up to 0.15% carbon is known as
13. A steel containing 0.8% carbon is known as
14. The rocker arms in internal combustion engines are of__________.
15. Gears are casted by
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