Materials and Construction

361. Zinc is highly _________ at room temperature.

  1. Ductile
  2. Resistant to atmospheric corrosion
  3. Malleable
  4. Brittle

Correct answer: (B)
Resistant to atmospheric corrosion

362. The hardest material just prior to diamond in Mhos scale is

  1. Topaz
  2. Carborundum
  3. Corundum
  4. Calcite

Correct answer: (C)
Corundum

363. The heat treatment process applied to cold formed steel parts is

  1. Normalising
  2. Tempering
  3. Artificial ageing
  4. Solution annealing

Correct answer: (D)
Solution annealing

364. The heat treatment process to which castings and the steel balls produced by cold heading are subjected is

  1. Tempering
  2. Normalising
  3. Annealing
  4. None of these

Correct answer: (B)
Normalising

365. The high expansion metal normally used in the bimetallic thermometer is _________ temperature measurement.

  1. Brass for low
  2. Nickel alloys for high
  3. Both 'a' & 'b'
  4. Aluminium for all

Correct answer: (C)
Both 'a' & 'b'

366. The impure iron (pig iron) that is tapped out from blast furnace contains about _________ percent carbon.

  1. 0.2
  2. 2
  3. 4
  4. 8

Correct answer: (C)
4

367. The increase in hardness of metal due to its cold working is termed as the _________ hardening.

  1. Work
  2. Age
  3. Induction
  4. Flame

Correct answer: (A)
Work

368. The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called

  1. Bauschinger effect
  2. Hooke's effect
  3. Hysteresis
  4. Relaxation

Correct answer: (A)
Bauschinger effect

369. The main constituent of carborundum is _________ carbide.

  1. Calcium
  2. Silicon
  3. Boron
  4. Aluminium

Correct answer: (B)
Silicon

370. The main purpose of galvanising iron sheets is to

  1. Harden the surface
  2. Increase its glossiness and lustre
  3. Prevent the action of water
  4. Prevent the action of oxygen

Correct answer: (C)
Prevent the action of water

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