221. Alinco, which is a aluminium-cobalt-nickel steel, is used for making
Surgical instruments
Powerful magnets
Chemical equipments
Boiler tubes
✅ The correct answer is option B.
Materials and Construction MCQs
222. The phenomenon in which slow extension of material takes place with the time at constant load is called
Plasticity
Creep
Elasticity
Ductility
✅ The correct answer is option B.
223. Which of the following is not an alloy of copper and tin?
Bell metal
Gun metal
Admiralty gun metal
Monel metal
✅ The correct answer is option D.
224. Which of the following is a light alloy?
Monel metal
Dow metal
German silver
Babbit metal
✅ The correct answer is option B.
225. Which one is remelted and poured into moulds to get cast iron?
Wrought iron
Pig iron
Low carbon steel
Mild steel
✅ The correct answer is option B.
226. The range of Mho’s scale of hardness is from
1 to 15
1 to 8
1 to 10
0 to 10
✅ The correct answer is option C.
227. Aluminium storage vessel can be used to store
Aqua regia
Ferrous sulphate
Hydrochloric acid (10%)
None of these
✅ The correct answer is option D.
228. Which of the following has the poorest wel-dability?
Low carbon steel
Mild steel
Wrought iron
High-carbon steel
✅ The correct answer is option D.
229. Generally __________ are subjected to galvanising (i.e., zinc coating).
Non-ferrous metals
Non-metals
Low carbon steels
Stainless steel
✅ The correct answer is option C.
230. Tempering of steel is done to make it
Brittle
Hard
Rollable
Soft
✅ The correct answer is option D.