Related Questions

Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
A Cheap electricity is available
B The precious metal content of copper is high
C There is a demand for ultrapure (99.99%) electrolytic copper
D All of the above
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
A Carbonates
B Bi-carbonates
C Iron & manganese
D Arsenic
As the impurities are oxidised, the melting point of iron
A Decreases
B Remains unchanged
C Increases
D May increase or decrease ; unpredictable
Presence of iron and manganese in water causes
A Reduction in its dissolved oxygen content
B Discoloration of bathroom fixtures
C Temporary hardness
D None of these
Which one of the following soil types of India is rendered infertile by the presence of excess iron?
A Desert sand
B Alluvial
C Podzolic
D Lateritic
Presence of high amount of silicon in cast iron
A Suppresses the decomposition of Fe3C
B Increases the formation of graphite
C Increases the contraction of the metal
D Reduces its fluidity
The presence of sulphur in pig iron makes
A It easily machinable
B It brittle
C It hard
D The casting unsound
Red short iron cracks when bent due to the presence of
A Sulphur
B Carbon
C Phosphorus
D Silicon
Presence of high phosphorous in cast iron increases its
A Fluidity
B Melting point
C Shrinkage
D Tensile strength
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
A liquation
B leaching
C levigation
D magnetic separation

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