High carbon steel
Wrought iron
Mild steel
None of these
✅ The correct answer is option D.
Materials and Construction MCQs
Chilled iron castings are
Easily machinable
Soft on surface
Highly wear resistant
None of these
✅ The correct answer is option C.
Lead is
Not resistant to corrosion
Used as a cathodic material
Not used as pigment (in its compound forms) for paints
Used as a shock absorber (in mattress form) between the foundation an steel framework of skyscrapper buildings
✅ The correct answer is option D.
Photographic plates are coated with
Silver nitrate
Silver halide
Calcium silicate
Metallic silver
✅ The correct answer is option B.
Monel alloy is
The costliest of all the alloys of nickel
Not suitable for making kitchen utensils
Used for making steam valves and turbine blades as it resists steam attack at high temperature
Not used in cast and wrought forms
✅ The correct answer is option C.
Nickel (56%) and molybdenum (17%) alloys are called
Monel
Hastealloy C
Inconel
Bronzes
✅ The correct answer is option B.
The purpose of nitriding the steel is to
Harden its surface
Soften its surface
Improve its reliability
None of these
✅ The correct answer is option A.
Ceramic materials
Are exemplified by clay and mica
Are poor electrical conductors due to lack of free electrons
Never exhibit polymorphism
All of the above
✅ The correct answer is option D.
With increase in carbide/graphite ratio in cast iron, its
Hardness & brittleness increases
Ductility decreases
Both A & B
Neither A nor B
✅ The correct answer is option C.
Presence of high amount of silicon in cast iron
Suppresses the decomposition of Fe₃ C
Increases the formation of graphite
Increases the contraction of the metal
Reduces its fluidity
✅ The correct answer is option B.