A. Abrasive
B. Corrosive
C. Both A. & B.
D. Neither A. nor B.
Related Mcqs:
- Most of the common metals have ______________ crystal structure?
A. Cubic
B. Hexagonal
C. Orthorhombic
D. None of these - Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the ______________ stress?
A. Ultimate
B. Yield point
C. Proof
D. None of these - The crystal structure of most of the common metals is_____________________?
A. Orthorhombic
B. Cubic
C. Hexagonal
D. None of these - Which of the following metals in not used for coating of the base metal to guard it against corrosion ?
A. Lead
B. Cadmium
C. Magnesium
D. Aluminium - Tin coating on metals is not done by_____________________?
A. Spraying
B. Powder metallurgy
C. Hot dipping
D. Electro-deposition - Atmospheric corrosion of metals result from their________________?
A. Slow oxidation
B. Fast oxidation
C. Fast hydration
D. Slow dehydration - Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?
A. Invar
B. Constantan
C. Chromel
D. Alumel - Which of the following is the lightest of engineering metals ?
A. Magnesium
B. Aluminium
C. Titanium
D. Tin - The metals occuring at the lower most position in the electromotive series____________________?
A. Do not resist corrosion
B. Resist corrosion very strongly
C. Are very brittle
D. Are heat insulators - Hydrochloric acid is _______________ corrosive to common metals?
A. Least
B. Not
C. Mildly
D. Highly
