MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Silicones have good electrical insulation because they are less stable to heat than organic polymers. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The bond energy of Si-O bond is ____________ |
| A. | 37 kJ/mol |
| B. | 115 kJ/mol |
| C. | 248 kJ/mol |
| D. | 502 kJ/mol |
| Answer» E. | |
| 3. |
On increasing the temperature, the viscosity of polysiloxanes ____________ |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | First increases then decrease |
| Answer» D. First increases then decrease | |
| 4. |
Which of the following is mono-functional? |
| A. | Dimethyl silicon chloride |
| B. | Trimethyl silicon chloride |
| C. | Tetramethyl silicon chloride |
| D. | Momethyl silicon chloride |
| Answer» C. Tetramethyl silicon chloride | |
| 5. |
The catalyst used in the preparation of poly-siloxanes is ____________ |
| A. | Benzoyl peroxide |
| B. | Grignard reagent |
| C. | Cumene hydroperoxide |
| D. | Lewis acid |
| Answer» C. Cumene hydroperoxide | |
| 6. |
Silicones resemble inorganic polymers in having high % of ____________ |
| A. | Ionic character of Si-O bond |
| B. | Organic groups on silicon atoms |
| C. | Controlled hydrolysis |
| D. | Solubility |
| Answer» B. Organic groups on silicon atoms | |
| 7. |
THE_BOND_ENERGY_OF_SI-O_BOND_IS?$ |
| A. | 37 kJ/mol |
| B. | 115 kJ/mol |
| C. | 248 kJ/mol |
| D. | 502 kJ/mol |
| Answer» E. | |
| 8. |
Silicones_have_good_electrical_insulation_because_they_are_less_stable_to_heat_than_organic_polymers.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
On increasing the temperature, the viscosity of polysiloxane? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | First increases then decrease |
| Answer» D. First increases then decrease | |
| 10. |
The proportion of momethyl silicon chloride determines the amount of cross-linking that can be obtained in polymerisation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which of the following gives linear chain silicones on polymerisation by controlled hydrolysis? |
| A. | Dimethyl silicon chloride |
| B. | Trimethyl silicon chloride |
| C. | Tetramethyl silicon chloride |
| D. | Momethyl silicon chloride |
| Answer» B. Trimethyl silicon chloride | |
| 12. |
Which of the following is tri-functional? |
| A. | Dimethyl silicon chloride |
| B. | Trimethyl silicon chloride |
| C. | Tetramethyl silicon chloride |
| D. | Momethyl silicon chloride |
| Answer» E. | |
| 13. |
The catalyst used in the preparation of poly-siloxanes is |
| A. | Benzoyl peroxide |
| B. | Grignard reagent |
| C. | Cumene hydroperoxide |
| D. | Lewis acid |
| Answer» C. Cumene hydroperoxide | |
| 14. |
Silicones resemble inorganic polymers in having high % of |
| A. | Ionic character of Si-O bond |
| B. | Organic groups on silicon atoms |
| C. | Controlled hydrolysis |
| D. | Solubility |
| Answer» B. Organic groups on silicon atoms | |
| 15. |
Silicones are called inorganic polymers due to absence of _________________in the main backbone chain. |
| A. | Nitrogen atom |
| B. | Oxygen atom |
| C. | Carbon atom |
| D. | Hydrogen atom |
| Answer» D. Hydrogen atom | |