411. __________ is added in stainless steel to prevent inter crystal corrosion.
Vanadium
Niobium
Chromium
Nickel
✅ The correct answer is option B.
Materials and Construction MCQs
412. Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of
Aluminium
Stainles steel
High silicon (14%) iron
Copper
✅ The correct answer is option B.
413. The most distinguished property of malleable cast iron is its high
Ductility
Hardness
Malleability
None of these
✅ The correct answer is option A.
414. A magnetic material becomes __________ above the Curie temperature.
Ferromagnetic
Diamagnetic
Paramagnetic
None of these
✅ The correct answer is option C.
415. Which of the following is the hardest material?
Topaz
Quartz
Corrundum
Flourite
✅ The correct answer is option C.
416. Cermets are used for making
Cutting tools
Abrasives
Both A & B
Neither A nor B
✅ The correct answer is option C.
417. Sulphuric acid pickling tanks are lined with
Nickel
Rubber
Aluminium
Glass
✅ The correct answer is option B.
418. High resistance electrical heating elements/wire are not made of
Marageing steel
Nimonic alloys
Kanthal wire
Nichrome
✅ The correct answer is option A.
419. Acetylene gas holder is made of
Copper
Cast iron
Steel
Monel metal
✅ The correct answer is option C.
420. 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.