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Materials and Construction MCQs

421. Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)₂. Lead pipes are readily corroded by

Dilute HC₁

Acetic acid

v

None of these

✅ The correct answer is option B.

422. Liners of a ball mill are never made of

Lead

Alloy steel

Rubber or ceramic material

Cast iron

✅ The correct answer is option A.

423. Alpha iron is stable __________ °C.

Above 1403

Upto 910

Above 1800

Between 910 & 1403

✅ The correct answer is option B.

424. Gunmetal and bronze are not corroded by the action of

Wet chlorine

Synthetic detergent solution

Hydrochloric acid (10%)

Nitric acid (< 25%)

✅ The correct answer is option B.

425. Wood is corroded by

Hydrochloric acid

SO₂ (dry or wet)

Chlorine (dry or wet)

All of the above

✅ The correct answer is option D.

426. __________ can replace tungsten in high speed steel,

Chromium

Vanadium

Cobalt

Molybdenum

✅ The correct answer is option D.

427. Brine (15% concentration) can be stored in a vessel made of

Monel

Karbate

Cast iron

None of these

✅ The correct answer is option A.

428. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?

Invar

Constantan

Chromel

Alumel

✅ The correct answer is option A.

429. Which of the following is not a nickel based alloy?

Inconel

Hastelloys

Nimonics

Babbit metal

✅ The correct answer is option D.

430. Carbon percentage in medium carbon steel is around

0.1 to 0.35

0.35 to 0.5

0.8 to 1.4

1 to 1. 5

✅ The correct answer is option B.

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