A. Concentration
B. Velocity
C. Temperature
D. None of these
Related Mcqs:
- Corrosion of metals cannot be prevented by its__________________?
A. Tempering
B. Chromising
C. Aluminising
D. Alloying - Out of the following, the ________________ pipe has the least corrosion resistance?
A. Mild steel
B. Copper
C. Cast iron
D. Wrought iron - Electrochemical corrosion can occur, only if ________________ is present in contact with metal?
A. Air
B. Oxygen
C. Liquid medium
D. Gaseous medium - Boiling point of water gets lowered at high altitudes (e.g., hills), because ___________________?
A. Temperature is low
B. Atmospheric pressure is low
C. Atmospheric pressure is high
D. None of these - Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when_________________?
A. Strain rate is increased
B. Grain size is increased
C. Prior cold deformation is increased
D. Not affected by any of the above parameters - Corrosion is____________________?
A. A physical phenomenon
B. A chemical phenomenon
C. Same as erosion
D. An uncontrollable phenomenon - In connection with corrosion of metals, passivation is the process that__________________?
A. Intensifies deterioration
B. Changes the composition of the metal
C. Inhibits further deterioration
D. None of these - With increase in impurities in metals, their corrosion resistances____________________?
A. Increase
B. Decrease
C. Remain same
D. May increase or decrease; depending on the type of metal - _____________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C ?
A. Veneering
B. Galvanising
C. Electroplating
D. Calorising - Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?
A. Lower cost
B. Abundant availability
C. Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry
D. None of these
