91. Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making
Nuts
Bolts
Chiesels
Studs
✅ The correct answer is option C.
Materials and Construction MCQs
92. Which of the following is not a copper based alloy with nickel?
German silver
Monel metal
Inconel
Constantan
✅ The correct answer is option C.
95. Refined acetic acid storage vessel are made of
Copper
Aluminium
High carbon steel
Nickel
✅ The correct answer is option B.
96. White metal is an alloy of
Lead, tin and cadmium
Copper, tin and zinc
Copper and lead
None of these
✅ The correct answer is option D.
97. Which of the following is the hardest?
Cementite
Pearlite
Austenite
Ferrite
✅ The correct answer is option C.
98. Which one has the maximum tensile strength out of the following?
Nodular cast iron
Pig iron
White cast iron
Grey cast iron
✅ The correct answer is option A.
99. H₂SO₄ (< 50% concentration) is corrosive to
Aluminium, mild steel, stainless steel, concrete & tin
Copper, cast iron & high silicon iron (14% Si)
Rubber (butyl and hard), silicone rubber & teflon
Glass, graphite, porcelain & stoneware
✅ The correct answer is option A.
100. Softening of hardned steel is done by its
Normalising
Tempering
Annealing
Carburising
✅ The correct answer is option B.