121. Caustic soda can be stored in __________ drums.
122. Vessels made of __________ can be used to store dry chlorine.
123. Ball bearings are generally made of
124. Bell metal is an alloy of
125. Brass is an alloy of
126. Bush bearings are made of
127. Hydrochloric acid is stored in a__vessel.
128. A material is called 'ductile', if it can be
129. The maximum percentage of chromium that can be added to steel is about
130. 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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