Top 1000+ Solved Material Science MCQ Questions Answer
Q. Fe + 2H+ = Fe+2 + H2 ischemical reaction in
a. hydrogen evolution
b. oxyfen absorption
c. both a and b
d. none of the above
Q. all metal above hydrogen in electrochemical series will have tendency to get corroded by
a. hydrogen evolution
b. oxyfen absorption
c. both a and b
d. none of the above
Q. in hydrogen evolution mechanism of corroison
a. cathode usually have large areas than anode
b. anode usually have large areas than cathode
c. anodes and cathodes are same
d. none of the above
Q. when electrolyte is neutral acqueous solution or alkaline solution, the type of corrosion takes place is known as
a. hydrogen evolution
b. oxyfen absorption
c. both a and b
d. none of the above
Q. due to formation of pinholes, pits and cavities in the metal, the type of corrosion which takes place is known as
a. stress corrosion cracking
b. pitting corrosion
c. crevice corrosion
d. erosion corrosion
Q. formation of small anodic and large cathodic areas is a charatcristics of
a. stress corrosion cracking
b. pitting corrosion
c. crevice corrosion
d. erosion corrosion
Q. due to brakege of protective film the type of corrosion which takes palce is known as
a. stress corrosion cracking
b. pitting corrosion
c. crevice corrosion
d. erosion corrosion
Q. pitting corrosion can occur under the following conditions
a. due to brake in protective coatings
b. due to destruction of passive layer
c. insufficient use of anodic inibitor
d. all of the above
Q. the type of corrosion occurs in granular metals and in homogeneous alloys is known as
a. stress corrosion cracking
b. crevice corrosion
c. intergranular corrosion
d. erosion corrosion
Q. intergranular corroison occurs
a. along the garin boundaries
b. within the grains
c. any where within the material
d. none of the above
Q. due to difference in electrode potential at grain and grain boundaries the type of corrosion which take place is known as -
a. stress corrosion cracking
b. crevice corrosion
c. intergranular corrosion
d. erosion corrosion
Q. stainless steels are preone to
a. stress corrosion cracking
b. crevice corrosion
c. intergranular corrosion
d. erosion corrosion
Q. residual stresses in materis leads to
a. stress corrosion cracking
b. crevice corrosion
c. intergranular corrosion
d. erosion corrosion
Q. due to non uniform and rapid cooling, welding, poor design, precipitation of second phase material leads to
a. crevice corrosion
b. stress corrosion cracking
c. intergranular corrosion
d. erosion corrosion
Q. stress corrosion cracking can be reduced by
a. eleminating the internal stresses with the help of heat treatment like stress- relief annealing or full annealing
b. by taking proper manufacturin g process
c. by using suitable material for suitable composition
d. none of the above