Copper
Cast iron
Steel
Monel metal
✅ The correct answer is option C.
Materials and Construction MCQs
Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property?
Silicon
Phosphorus
Sulphur
None of these
✅ The correct answer is option A.
Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)₂. Lead pipes are readily corroded by
Dilute HC₁
Acetic acid
v
None of these
✅ The correct answer is option B.
Liners of a ball mill are never made of
Lead
Alloy steel
Rubber or ceramic material
Cast iron
✅ The correct answer is option A.
Alpha iron is stable __________ °C.
Above 1403
Upto 910
Above 1800
Between 910 & 1403
✅ The correct answer is option B.
Gunmetal and bronze are not corroded by the action of
Wet chlorine
Synthetic detergent solution
Hydrochloric acid (10%)
Nitric acid (< 25%)
✅ The correct answer is option B.
Wood is corroded by
Hydrochloric acid
SO₂ (dry or wet)
Chlorine (dry or wet)
All of the above
✅ The correct answer is option D.
__________ can replace tungsten in high speed steel,
Chromium
Vanadium
Cobalt
Molybdenum
✅ The correct answer is option D.
Brine (15% concentration) can be stored in a vessel made of
Monel
Karbate
Cast iron
None of these
✅ The correct answer is option A.
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 (l/20th of ordinary metals)?
Invar
Constantan
Chromel
Alumel
✅ The correct answer is option A.