A. Air
B. Oxygen
C. Liquid medium
D. Gaseous medium
Related Mcqs:
- 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 - The cathode in an electrochemical cell always carries____________________?
A. Negative charge
B. Positive charge
C. Zero charge
D. Positive or negative charge depending upon the nature of the cell - Out of the following, the ________________ pipe has the least corrosion resistance?
A. Mild steel
B. Copper
C. Cast iron
D. Wrought iron - Corrosion rate cannot be lowered by reducing the ________________ of the corroding medium?
A. Concentration
B. Velocity
C. Temperature
D. None of these - Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting) ?
A. V/A
B. V/A2
C. V2/A
D. V2/A2 - The trace metal present in insulin is____________________?
A. Cu
B. Zn
C. Fe
D. Ni - The most abundant metal present in the earth’s crust is__________________?
A. Iron
B. Copper
C. Titanium
D. Aluminium - Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?
A. 5
B. 10
C. 20
D. 35 - 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 - A form of stress corrosion failure termed as ‘season cracking’ is generally observed in __________________?
A. Thermosetting polymers
B. High carbon steels
C. Brasses
D. Borosilicate glasses
