Solid solution hardening
Screw dislocation
Strain ageing
Twinning
✅ The correct answer is option C.
Materials and Construction MCQs
182. Reduction in the grain size reduces the __________ of the material.
Fatigue resistance
Tensile strength
Creep resistance
All of the above
✅ The correct answer is option C.
183. SO₃ is absorbed using H₂SO₄ in a
Cast iron packed tower
Stainless steel plate tower
Packed steel tower lined with acid proof bricks
None of these
✅ The correct answer is option C.
184. Mild steel is a/an __________ steel.
Low carbon
Medium carbon
High carbon
High alloy
✅ The correct answer is option A.
185. Stainless steel is not corroded by
Hydrochloric acid (10%)
Nitric acid (10%)
Sulphuric acid (10%)
Saturated brine
✅ The correct answer is option B.
186. The hardest material just prior to diamond in Mho’s scale is
Topax
Carborundum
Corrundum
Calcite
✅ The correct answer is option C.
187. Which of the following commercial metals is most abundantly found in India?
Copper
Aluminium
Nickel
Zinc
✅ The correct answer is option B.
188. Super conductors are those substances, which
Offer no resistance to current flow
Conduct electricity at low temperature
Offer high resistance to current flow
Conduct electricity at high temperature
✅ The correct answer is option A.
189. Rotary kilns in cement industry are lined with____bricks.
Fireclay
Silica
Lead
High alumina & high magnesia
✅ The correct answer is option D.
190. Silicone rubber is not resistant to the corrosive action of
Sulphuric acid (10%)
Sulphuric acid (95%)
Ether
Both B and C
✅ The correct answer is option D.