341. Thermoplastic resins are those polymers, which
Has decreased plasticity at increasing temperature
Can not be moulded
Easily deform under pressure at high temperature
None of these
✅ The correct answer is option C.
Materials and Construction MCQs
342. Which of the following stainless steels is non-magnetic?
Ferritic
Martensitic
Austenitic
None of these
✅ The correct answer is option C.
343. Which of the following crystal structures characterises the austenitic stainless steel?
Simple hexagonal
Body centred cubic
Face centred cubic
None of these
✅ The correct answer is option C.
344. With increase in the carbon percentage in the steel, its
Hardness increases
Ductility reduces
Tensile strength increases
All of the above
✅ The correct answer is option D.
345. High speed steel should have high
Toughness
Wear resistance
Hardenability
Both B & C
✅ The correct answer is option D.
346. Ferric stainless steels compared to austenitic stainless steels
Have lower corrosion resistance
Are harder to fabricate
Are less ductile and hence less suitable for cold pressing
All of the above
✅ The correct answer is option D.
347. Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its
High co-efficient of thermal expansion
Low thermal conductivity
High corrosion resistance
All of the above
✅ The correct answer is option C.
348. Diamagnetic materials are magnetised
Strongly
Only slightly
With eddy currents only
In a direction opposite to that of the applied field
✅ The correct answer is option D.
349. Containers made of high silicon cast iron (14% Si) are not suitable for the storage of
Acetic acid
Benzoic & boric acids
Phosphoric acid (95%) & sulphuric acid (95%)
Hydrochloric acid (concentrated)
✅ The correct answer is option D.
350. Maximum consumption of zinc is in
Alloying
Galvanising
Utensil manufacture
Electrical industry
✅ The correct answer is option B.