131.
The machinability of steel is improved by adding

132.
Nodular cast iron is produced by adding ________ to the molten cast iron.

133.
Addition of manganese to aluminium results in

134.
Addition of copper to aluminium results in

135.
Addition of lead and bismuth to aluminium results in

136.
Addition of silicon to aluminium results in

137.
The hardness of steel primarily depends on

138.
Beryllium bronze contains

139.
Aluminium bronze contains

140.
The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will

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