Engineering Chemistry Mid - II, March - 2015

1.The only rubber which does not require vulcanization is
  • Butyl rubber
  • Thiokol rubber
  • Neoprene
  • Buna-S
Answer: B
2.Which of the following is molecular formula of gypsum
  • CaSO4
  • CaSO4 1/2H2O
  • CaSO4 2H2O
  • CaSO4 5H2O
Answer: C
3.A plastic resin which becomes soft on heating and hard on cooling is called
  • Thermo elastic
  • Thermite
  • Thermosetting
  • Thermoplastic
Answer: D
4.If the arrangement of functional groups on polymer chain is alternate, it is called
  • Syndiotactic
  • Atactic
  • isotactic
  • tacticity
Answer: A
5.The species responsible for propagation of polymerization reaction of ethylene using benzoyl peroxide as initiator is
  • Cation
  • Anion
  • Free radical
  • Transition complex
Answer: C
6.Which of the following compound can be used as coagulant
  • Potash alum
  • Aluminium Sulphate
  • Sodium Aluminate
  • All
Answer: D
7.Purification of brackish water by reverse osmosis is also called as
  • Super filtration
  • Supra filtration
  • Hypo filtration
  • All
Answer: A
8.The colour change at the end point in complexometric titration by EDTA is
  • Colourless to wine red
  • Clear blue to colourless
  • Wine red to clear blue
  • colourless to clear blue
Answer: C
9.Caster oil is used as
  • Anti skinning agent
  • Anti foaming agent
  • Anti corrosive agent
  • All
Answer: B
10.Temporary hardness of water can be removed by
  • Boiling
  • Filtration
  • Solvent extraction
  • Sedimentation
Answer: A
11._____________ polymerization is used for the preparation of stereo specific polymers.
Answer: Coordination chain
12.A flaw less glossy finish to plastics is given by addition of ________________.
Answer: Lubricants
13._______________ form of poly aniline exhibits more conductance.
Answer: Emeraldine salt
14.An arbitrary scale known as ______________ is used to indicate the effect of temperature on viscosity.
Answer: Viscosity Index
15.Graphite is an example of ___________ type refractory.
Answer: Neutral
16.In lime-soda process of softening, calcium and magnesium ions are precipitated as _____________ and ____________.
Answer: Calcium carbonate (CaCO3) and magnesium hydroxide Mg(OH)2
17.______________ is a process of allowing water to stand undisturbed in big tanks during municipal treatment.
Answer: Sedimentation
18.Dissolved CO2 may be removed from water by addition of ____________.
Answer: Ammonium hydroxide or NH4OH
19.Hardness of a water sample is 10 ppm, which can be expressed as ______ in degree Clarke.
Answer: 0.70Cl
20.The process of formation of wet steam is called as ______________ .
Answer: Priming