Top 1000+ Solved Material Science MCQ Questions Answer
Q. general corrosion is also known as
a. uniform corrosion
b. localised corrosion
c. harmless corrosion
d. all of the above
Q. the best example of general corrosion is
a. corrosion of manhole cover
b. corrosion of springs
c. corrosion of fasteners
d. none of the above
Q. the best and economic way of preventing general corrosion is
a. coating the metal
b. cathodic protection
c. using proper inhibitors
d. all of the above
Q. galvanic corrosion is also known as
a. bimetallic corrosion
b. dry corrosion
c. high temperature corrosion
d. low temperature corrosion
Q. which of the following is essential requirement for the galvanic corrosion to occur ?
a. an electrolyte in contact with two metals
b. electrical contact between two metals
c. a difference of potential between two metals
d. all of the above
Q. which of the following methods are used ot reduce galvanic corrosion ?
a. select two metals that are close together in the galvanic corrosion
b. avoid relatively small area of less noble metal and large area of more noble metal
c. insulate the metal from each other
d. all of the above
Q. in galvanic corrosion, as the area of anode metal decreases with respect to cathode area of metal, the corrosion rate
a. increases
b. decreases
c. remain constant
d. none of the above
Q. pitting corrosion is also known as
a. low temperature corrosion
b. high temperature corrosion
c. bimetal corrosion
d. none of the above
Q. pitting corrosion is also known as
a. highly localized corrosion
b. low temperature corrosion
c. high temperature corrosion
d. bimetal corrosion
Q. pitting corrosion is a bimetal corrosion, the statement is
a. true
b. false
c. not applicable to it
d. none of the above
Q. galvanic corrosion is a highly localized corrosion, the statement is
a. false
b. true
c. not applicable to it
d. none of the above
Q. crevice corrosion is also a localized attack, the statement is
a. true
b. false
c. not applicable to it
d. none of the above
Q. phenomenon of crevice corrosion is based on
a. electrochemi cal corrosion
b. electromenta l corrosion
c. electromech anical corrosion
d. none of the above
Q. crevice corrosion rate become faster due to
a. gases in the liquid or electrolyte
b. high flow of liquid or electrolyte
c. trapped stagnant liquids, which is highly concentrated
d. none of the above
Q. which of the following remedial measure is suitable to prevent crevice corrosion
a. avoid joining of metal rivets and bolts. use welding
b. avoid solution get into crevice by applying grease
c. routine cleaning must be carried out
d. all of the above