Ferromagnetic above its curie point (i.e., 415°C)
Having h.c.p. crystal lattice
Ferromagnetic at room temperature
Not resistant to oxidation at high temperature
✅ The correct answer is option C.
Materials and Construction MCQs
12. Which of the following is the most prone to atmospheric corrosion?
Silver
Iron
Tin
Copper
✅ The correct answer is option B.
13. Which of the following is the lightest of engineering metals?
Magnesium
Aluminium
Titanium
Tin
✅ The correct answer is option A.
14. How many molecules per unit cell are there in a face centred cubic lettice?
2
4
6
8
✅ The correct answer is option B.
15. Ability of a material to __________ is indicated by its damping capacity.
Withstand compression
Absorb vibration
Absorb shock
None of these
✅ The correct answer is option B.
16. When the steel is subjected to normalising, its __________ decreases.
Yield point
Ductility
Ultimate tensile strength (UTS)
None of these
✅ The correct answer is option B.
17. Galvanising is generally done on
Non-ferrous metals
Low carbon steel
Stainless steel
Cast iron
✅ The correct answer is option B.
18. The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.
Non-crystalline solid
Crystalline
Rubberry
Non-crystalline organic polymeric
✅ The correct answer is option D.
19. Cast iron is having very high
Proximity between its elastic limit and ultimate breaking strength
Ductility
Tensile strength
All of the above
✅ The correct answer is option A.
20. Biological shield in a nuclear power reactor is made of
Concrete
Steel
Cadmium
Zircalloy
✅ The correct answer is option A.