51. In order to be called steel, an alloy should have iron percentage greater than
80
70
90
50
✅ The correct answer is option A.
Materials and Construction MCQs
52. Wood metal is not used for making
Soft solder
Casting for dental work
Storage tank for storing brine and caustic soda
Fusible safety plug for pressure cooker
✅ The correct answer is option C.
53. Caustic soda is transported in __________ lined containers.
Glass
Nickel
Neoprene
Either B or C
✅ The correct answer is option D.
54. Titanium metal
Exists in three allotropic forms
Can not be welded
Is used in oceanographic and space exploration applications
None of these
✅ The correct answer is option C.
55. Carbon is present in the combined form (carbide) in case of
Pig iron
Steel
Ferroalloys
All of the above
✅ The correct answer is option D.
56. A chemical change takes place when iron
Rusts
Melts
Is heated
None of these
✅ The correct answer is option A.
57. Perspex is nothing but
Acrylic sheet
An elastomer
An alloy of lead and tin
Aluminium foil clad with bakelite
✅ The correct answer is option A.
58. Dilute sulphuric acid is transported in __________ pipes.
Mild steel
Lead
Copper
Special alloys
✅ The correct answer is option B.
59. The preferred material of construction for storage tanks for 98% sulphuric acid is
Aluminium
Lead
Stainless steel 316
Mild steel
✅ The correct answer is option B.
60. Ammonium chloride solution is stored/ treated in __________ vessels/pipes.
Plain carbon steel
Stainless steel
Rubber or durmet-20 lined
Lead
✅ The correct answer is option C.