Engineering Chemistry MCQS with Answers pdf Download
Topic Covering: Silicones and Polymeric Composites and R, S- Configuration and Water Softening.
Which of the following is the bond energy of the Si-O bond?
(A). Â 502 kJ/mol
(B). Â 37 kJ/mol
(C). Â 248 kJ/mol
(D). Â 115 kJ/mol
(E). None of these
Multiple Choice Question Answer: Â a
Silicones have good electrical insulation because for heating than organic polymers they are less stable.
(A). Â False
(B). Â True
(E). None of these
Multiple Choice Question Answer: Â a
_______ incorrect.
(A). Â the boiler before the water enters into the boiler internal treatment is carried out outside
(B). Â by blow-down operations, internal treatment methods are followed
(C). Â in low-pressure boilers internal treatment is required
(D ). Â a corrective method of internal treatment is
(E). None of these
Multiple Choice Question Answer: Â a
Which of the following is the catalyst used in the preparation of poly-siloxanes?
(A). Â Benzoyl peroxide
(B). Â Cumene hydroperoxide
(C). Â Lewis acid
(D). Â Grignard reagent
(E). None of these
Multiple Choice Question Answer: Â d
_____________ is tri-functional.
(A). Â Trimethyl silicon chloride
(B). Â Momethyl silicon chloride
(C). Â Tetramethyl silicon chloride
(D). Â Dimethyl silicon chloride
(E). None of these
Multiple Choice Question Answer: Â b
Potable water treatment does not involve which one?
(A). Â Disinfection
(B). Â Demineralisation
(C). Â Coagulation
(D). Â Sedimentation
(E). None of these
Multiple Choice Question Answer: Â b
In polymerisation, the proportion of momethyl silicon chloride determines the amount of cross-linking that can be obtained.
(A). Â False
(B). Â True
(E). None of these
Multiple Choice Question Answer: Â b
Which of the following is the configuration from the ligand of highest priority to the ligand of lowest priority if our eyes travel in a counter-clockwise direction?
(A). Â R-Configuration
(B). Â S-Configuration
(C). Â E-Configuration
(D). Â C-Configuration
(E). None of these
Multiple Choice Question Answer:Â b
_______ is not a priority rule for R, S-Configuration.
(A). Â to the chiral centre are all different, priority depends on the atomic number if the four atoms attached, with the atom of lower atomic numbers getting lower priority
(B). Â to chiral centre are same if the two atoms attached, the atoms attached to every one of these first atoms are compared
(C). None of these
(D). Â both atoms are considered to be duplicated or triplicated when there is a double bond or triple bond
(E). Â to the chiral centre are all different if the four atoms attached, priority depends on atomic number, with the atom of higher atomic numbers getting lower priority
Multiple Choice Question Answer: Â e
By working with which one the exhausted anion exchangers can be regenerated?
(A). Â Acid solution
(B). Â Alcohol solution
(C). Â Alkali solution
(D). Â Water
(E). None of these
Multiple Choice Question Answer: Â c
_____ gives linear chain silicones on polymerisation by controlled hydrolysis.
(A). Â Tetramethyl silicon chloride
(B). Â Trimethyl silicon chloride
(C). Â Momethyl silicon chloride
(D). Â Dimethyl silicon chloride
(E). None of these
Multiple Choice Question Answer: Â d
Which of the following is the external treatment of water does not include?
(A). Â Lime-soda process
(B). Â Zeolites
(C). Â Sequestration
(D). Â Ion-exchange process
(E). None of these
Multiple Choice Question Answer:Â c
In high-pressure boilers, external treatment is a preventive method and it is required.
(A). Â True
(B). Â False
(E). None of these
Multiple Choice Question Answer:Â a
In the main backbone, chain silicones are called inorganic polymers due to the absence of which one?
(A). Â Nitrogen atom
(B). Â Oxygen atom
(C). Â Carbon atom
(D). Â Hydrogen atom
(E). None of these
Multiple Choice Question Answer:Â c
In having a high % of which silicones resemble inorganic polymers?
(A). Â Controlled hydrolysis
(B). Â Organic groups on silicon atoms
(C). Â Solubility
(D). Â Ionic character of Si-O bond
(E). None of these
Multiple Choice Question Answer:Â d
Which of the following is the according to the selection rules, the decreasing order of preference?
(A). –NH2 > -CH(CH3)2 > -C6H5 > -H
(B). –CH(CH3)2 > -C6H5 > -H> -NH2
(C). -C6H5 > -CH(CH3)2 >–NH2 > -H
(D). –NH2 > -C6H5 > -CH(CH3)2 > -H
(E). None of these
Multiple Choice Question Answer: Â d
______ conditioning method is not used in internal treatment.
(A). Â Calgon
(B). Â Bicarbonate
(C). Â Carbonate
(D). Â Colloidal
(E). None of these
Multiple Choice Question Answer: Â b
The viscosity of polysiloxanes which one on increasing the temperature?
(A). Â Decreases
(B). Â Remain constant
(C). Â Increases
(D). Â First increases then decrease
(E). None of these
Multiple Choice Question Answer: Â b
________ is mono-functional.
(A). Â Dimethyl silicon chloride
(B). Â Momethyl silicon chloride
(C). Â Trimethyl silicon chloride
(D). Â Tetramethyl silicon chloride
(E). None of these
Multiple Choice Question Answer:Â c
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