1. Which of the following is the bond energy of the Si-O bond?
(A). 502 kJ/mol
(B). 37 kJ/mol
(C). 248 kJ/mol
(D). 115 kJ/mol
(E). None of these
Answer: A
2. Silicones have good electrical insulation because for heating than organic polymers they are less stable.
(A). False
(B). True
(E). None of these
Answer: A
3. _______ incorrect.
(A). the boiler before the water enters into the boiler internal treatment is carried out outside
(B). by blow-down operations, internal treatment methods are followed
(C). in low-pressure boilers internal treatment is required
(D). a corrective method of internal treatment is
(E). None of these
Answer: A
4. Which of the following is the catalyst used in the preparation of poly-siloxanes?
(A). Benzoyl peroxide
(B). Cumene hydroperoxide
(C). Lewis acid
(D). Grignard reagent
(E). None of these
Answer: D
5. ____________ is tri-functional.
(A). Trimethyl silicon chloride
(B). Momethyl silicon chloride
(C). Tetramethyl silicon chloride
(D). Dimethyl silicon chloride
(E). None of these
Answer: B
6. Potable water treatment does not involve which one?
(A). Disinfection
(B). Demineralisation
(C). Coagulation
(D). Sedimentation
(E). None of these
Answer: B
7. In polymerisation, the proportion of momethyl silicon chloride determines the amount of cross-linking that can be obtained.
(A). False
(B). True
(E). None of these
Answer: B
8. 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). R-Configuration
(B). S-Configuration
(C). E-Configuration
(D). C-Configuration
(E). None of these
Answer: B
9. _______ is not a priority rule for R, S-Configuration.
(A). 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). 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). both atoms are considered to be duplicated or triplicated when there is a double bond or triple bond
(E). 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
Answer: E
10. By working with which one the exhausted anion exchangers can be regenerated?
(A). Acid solution
(B). Alcohol solution
(C). Alkali solution
(D). Water
(E). None of these
Answer: C
11. _____ gives linear chain silicones on polymerisation by controlled hydrolysis.
(A). Tetramethyl silicon chloride
(B). Trimethyl silicon chloride
(C). Momethyl silicon chloride
(D). Dimethyl silicon chloride
(E). None of these
Answer: D
12. Which of the following is the external treatment of water does not include?
(A). Lime-soda process
(B). Zeolites
(C). Sequestration
(D). Ion-exchange process
(E). None of these
Answer: C
13. In high-pressure boilers, external treatment is a preventive method and it is required.
(A). True
(B). False
(E). None of these
Answer: A
14. In the main backbone, chain silicones are called inorganic polymers due to the absence of which one?
(A). Nitrogen atom
(B). Oxygen atom
(C). Carbon atom
(D). Hydrogen atom
(E). None of these
Answer: C
15. In having a high % of which silicones resemble inorganic polymers?
(A). Controlled hydrolysis
(B). Organic groups on silicon atoms
(C). Solubility
(D). Ionic character of Si-O bond
(E). None of these
Answer: D
16. 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
Answer: D
17. ______ conditioning method is not used in internal treatment.
(A). Calgon
(B). Bicarbonate
(C). Carbonate
(D). Colloidal
(E). None of these
Answer: B
18. The viscosity of polysiloxanes which one on increasing the temperature?
(A). Decreases
(B). Remain constant
(C). Increases
(D). First increases then decrease
(E). None of these
Answer: B
19. ________ is mono-functional.
(A). Dimethyl silicon chloride
(B). Momethyl silicon chloride
(C). Trimethyl silicon chloride
(D). Tetramethyl silicon chloride
(E). None of these
Answer: C
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