Materials and Construction MCQs

181. __________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.

Solid solution hardening

Screw dislocation

Strain ageing

Twinning

✅ The correct answer is option C.

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.