71. The most commonly used resin for making reinforced plastic is
Unsaturated polyester
Polypropylene
Polyurathane
Nylon-6
✅ The correct answer is option A.
Materials and Construction MCQs
72. Mild steel storage vessels are suitable for the storage of
Anhydrous ammonia
Fatty acids
Hydrochloric acid (95%)
Sulphuric acid (25%)
✅ The correct answer is option A.
73. Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel
Rubber
Monel
Glass
Nickel
✅ The correct answer is option C.
74. The ability of a material to offer resistance to scratching or indentation is a measure of its
Brittleness
Toughness
Hardness
Resilience
✅ The correct answer is option C.
75. ‘Semi steel’ is
Produced by adding 10-20% steel to the cupola charge
Stronger than cast iron
Both A & B
Neither A nor B
✅ The correct answer is option C.
76. Mild steel is
A low carbon steel (0.05 to 0.3% carbon)
Highly resistant to corrosion (as much as stainless steel)
A high carbon steel (0.5 to 1.5% carbon)
Very poor in strength & ductility
✅ The correct answer is option A.
77. Lead lined equipments & vessels are suitable for handling
Hydrochloric acid (10%)
Nitric acid
Sulphuric acid upto 60°C
All of the above
✅ The correct answer is option C.
78. Brass is an alloy of
Nickel and tin
Copper and zinc
Tin and lead
Copper, nickel and zinc
✅ The correct answer is option B.
79. Hydrochloric acid is stored in a__vessel.
Lead lined steel
Rubber lined steel
Stainless steel
Cast iron
✅ The correct answer is option B.
80. Maximum permissible sulphur content in steel is __________ percent.
0.015
0.055
0.505
0.805
✅ The correct answer is option B.