1991. Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of
Stainless steel or glass lined steel
Nickel clad steel
High silicon cast iron
Aluminium
✅ The correct answer is option A.
1994. Carbon is present in steel wholly in the
Combined form
Free state as graphite
Both A & B
Neither A nor B
✅ The correct answer is option A.
1997. As the impurities are oxidised, the melting point of iron
Decreases
Remains unchanged
Increases
May increase or decrease ; unpredictable
✅ The correct answer is option C.
2000. German silver is an alloy of copper, nickel and
Zinc
Silver
Tin
Lead
✅ The correct answer is option A.
2003. Which of the following is not an alloy of copper?
Muntz metal
Admirability gun metal
German silver
Pewter metal
✅ The correct answer is option D.
2006. Aluminium as a material of construction suffers from the disadvantage of
Very high cost
Rather low tensile strength
Very low strength to weight ratio
Scarce availability
✅ The correct answer is option B.
2009. Constantan is an alloy of
Cu (55%) & Sn (45%)
Cu (55%) & Ni (45%)
Pt (95%) & Rh (10%)
Fe (80%) & Ni (20%)
✅ The correct answer is option B.
2012. Which of the following is produced by addition polymerisation?
Polybutadiene
Phenol formaldehyde
Urea-formaldehyde
Dacron
✅ The correct answer is option A.
2015. 18-4-1 high speed steel contains 18%, 4% and 1% respectively of
Tungsten, vanadium and chromium
Tungsten, chromium and vanadium
Vanadium, chromium and tungsten
Chromium, tungsten and vanadium
✅ The correct answer is option B.
2018. Which of the following comprises of hydrocarbons?
Mica flakes
Glass
Rubber
None of these
✅ The correct answer is option C.