21. Caustic soda can be stored in __________ drums.
22. Vessels made of __________ can be used to store dry chlorine.
23. Ball bearings are generally made of
24. Bell metal is an alloy of
25. Brass is an alloy of
26. Bush bearings are made of
27. Hydrochloric acid is stored in a__vessel.
28. A material is called 'ductile', if it can be
29. The maximum percentage of chromium that can be added to steel is about
30. Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making
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