141. Plastics are
Used in very high temperature applications
Non-biodegradable
Not suitable for drainage pipe manufacture
All of the above
✅ The correct answer is option B.
Materials and Construction MCQs
142. The formation of oxide film on a metal due to atmospheric exposure reduces its
Toughness
Stiffness
Creep limit
All of the above
✅ The correct answer is option C.
144. Sulphur melting pit in the sulphuric acid plant is made of
Lead lined stainless steel
Cast iron
Steel or cement-brick lined
Hard wood
✅ The correct answer is option C.
145. Tin vessels are corroded by
Anhydrous ammonia
Aromatic solvents
Synthetic detergent solution
None of these
✅ The correct answer is option D.
146. Cast iron has
Very high tensile strenth
High ductility
High malleability
Elastic limit close to ultimate breaking strength
✅ The correct answer is option D.
147. The process of coating steel sheets by zinc to improve its corrosion resistance is called
Calorising
Galvanising
Zincification
Tempering
✅ The correct answer is option B.
148. Presence of nickel in steel improves its
Corrosion resistance
Cutting ability
Wear resistance
All of the above
✅ The correct answer is option A.
149. Brass container is suitable for storing
Aqueous ammonia
Beer
H₂SO₄(95%)
Phosphoric acid (95%)
✅ The correct answer is option B.
150. __________ alloys have the highest specific strength of all the structural materials out of the following.
Magnetic steel
Titanium
Chromium
Magnesium
✅ The correct answer is option B.