131. 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
✅ The correct answer is option C.
Materials and Construction MCQs
132. The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.
Precipitation
Fusion
Sintering
Agglomeration
✅ The correct answer is option C.
133. Hardening of steel is not possible unless it is heated __________ critical point.
Above the highest
Above the lowest
Between the first & second
Between the second & third
✅ The correct answer is option B.
134. White cast iron is not
Malleable
Whitish in color
Brittle
Strong and hard
✅ The correct answer is option A.
135. Hydrochloric acid absorber in made of
Cast iron
Mild steel
Karbate
Stainless steel
✅ The correct answer is option C.
136. Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as
Sheradising
Parkerising
Anodising
None of these
✅ The correct answer is option A.
137. Polythene (low or high density) containers are not corroded by
Sulphuric acid (10%) at room temperature
Nitric acid (95%) at room temperature
Sulphur trioxide at 60°C
Any of these
✅ The correct answer is option A.
138. __________ is used for determining the tensile strength of steels.
Hydraulic press
Universal testing machine
Mechanical press
None of these
✅ The correct answer is option B.
139. Ball bearings are normally made of __________ steel.
High speed
High carbon
Chrome
Silicon
✅ The correct answer is option C.
140. Addition of 2% nickel in steel makes it suitable for making
Electronic valves
Boiler plates, rivets etc
Turbine blades
Connecting rod
✅ The correct answer is option B.