Q.1

Presence of manganese in alloy steel improves its

  • corrosion resistance.
  • cutting ability.
  • abrasion resistance & toughness.
  • elasticity & creep resistance.
Q.2

Which metal is protected by the layer of its own oxide ?

  • Iron
  • Silver
  • Calcium
  • Aluminium
Q.3

Brass is an alloy of

  • nickel and tin
  • copper and zinc
  • tin and lead
  • copper, nickel and zinc
Q.4

__________ possesses viscoelastic properties.

  • Cork
  • Glass
  • Graphite
  • Rubber
Q.5

Wrought iron is a suitable material of construction for handling __________ solutions.

  • dilute acidic
  • concentrated acidic
  • alkalis & alkaline
  • none of these
Q.6

Steel rods are used in reinforced concrete to increase its __________ strength.

  • shear
  • tensile
  • compressive
  • none of these
Q.7

Which of the following alloy steels is the most suitable for making gun barrels and projectiles ?

  • Tungsten steel
  • Molybdenum steel
  • Nickel-chrome steel
  • Cobalt steel
Q.8

The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.

  • precipitation
  • fusion
  • sintering
  • agglomeration
Q.9

In order to be called steel, an alloy should have iron percentage greater than

  • 80
  • 70
  • 90
  • 50
Q.10

Which of the following undergoes granular fracture ?

  • Wrought iron
  • Steel
  • Cast iron
  • None of these
Q.11

Presence of even 0.of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.

  • oxygen
  • arsenic
  • antimony
  • bismuth
Q.12

Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with

  • acidic refractory
  • rubber
  • karbate
  • lead or acid-proof bricks
Q.13

Corrosion involves exchange of electrons in __________ corrosion.

  • chemical
  • electrochemical
  • both (a) & (b)
  • neither (a) nor (b)
Q.14

Sulphuric acid pickling tanks are lined with

  • nickel
  • rubber
  • aluminium
  • glass
Q.15

Nickel is a constituent of

  • bronze
  • solder
  • duralumin
  • monel metal
0 h : 0 m : 1 s