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. |
The efficiency of today’s best solar cell is about ___________ |
| A. | 15-20% |
| B. | 40% |
| C. | 50% |
| D. | 75% |
| Answer» C. 50% | |
| 2. |
What are the advantages of nano-composite packages? |
| A. | Lighter and biodegradable |
| B. | Enhanced thermal stability, conductivity and mechanical strength |
| C. | Gas barrier properties |
| D. | All of the mentioned |
| Answer» E. | |
| 3. |
Quantum confinement results in ___________ |
| A. | Energy gap in semiconductor is proportional to the inverse of the square root of the size |
| B. | Energy gap in semiconductor is proportional to the inverse of the size |
| C. | Energy gap in semiconductor is proportional to the square of size |
| D. | Energy gap in semiconductor is proportional to the inverse of the square of size |
| Answer» E. | |
| 4. |
The properties like dispersibility, conductivity, etc changes on varying the ___________ |
| A. | Size |
| B. | Composition |
| C. | Surface properties |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 5. |
The properties like melting point, solubility, color, etc changes on varying the ___________ |
| A. | Size |
| B. | Composition |
| C. | Surface properties |
| D. | None of the mentioned |
| Answer» B. Composition | |
| 6. |
Which of the following is an example of top-down approach for the preparation of nanomaterials? |
| A. | Gas phase agglomeration |
| B. | Molecular self-assembly |
| C. | Mechanical grinding |
| D. | Molecular beam epitaxy |
| Answer» D. Molecular beam epitaxy | |
| 7. |
WHAT_ARE_THE_ADVANTAGES_OF_NANO-COMPOSITE_PACKAGES??$ |
| A. | Lighter and biodegradable |
| B. | Enhanced thermal stability, conductivity and mechanical strength |
| C. | Gas barrier properties |
| D. | All of the mentioned |
| Answer» E. | |
| 8. |
The_efficiency_of_today’s_best_solar_cell_is_about$# |
| A. | 15-20% |
| B. | 40% |
| C. | 50% |
| D. | 75% |
| Answer» C. 50% | |
| 9. |
Which of the following is the application of nanotechnology to food science and technology? |
| A. | Agriculture |
| B. | Food safety and biosecurity |
| C. | Product development |
| D. | All of the mentioned |
| Answer» E. | |
| 10. |
Which of the following is the principal factor which causes the properties of nanomaterials to differ significantly from other materials? |
| A. | Size distribution |
| B. | Specific surface feature |
| C. | Quantum size effects |
| D. | All the mentioned |
| Answer» E. | |
| 11. |
Quantum confinement results in |
| A. | Energy gap in semiconductor is proportional to the inverse of the square root of size |
| B. | Energy gap in semiconductor is proportional to the inverse of the size |
| C. | Energy gap in semiconductor is proportional to the square of size |
| D. | Energy gap in semiconductor is proportional to the inverse of the square of size |
| Answer» E. | |
| 12. |
The properties like dispersibility, conductivity, etc changes on varying the |
| A. | Size |
| B. | Composition |
| C. | Surface properties |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 13. |
The properties like melting point, solubility, color, etc changes on varying the |
| A. | Size |
| B. | Composition |
| C. | Surface properties |
| D. | None of the mentioned |
| Answer» B. Composition | |
| 14. |
Which of the following is an example of bottom-up approach for the preparation of nanomaterials? |
| A. | Etching |
| B. | Dip pen nano-lithography |
| C. | Lithography |
| D. | Erosion |
| Answer» C. Lithography | |
| 15. |
Which of the following is an example of top-down approach for the preparation of nanomaterials? |
| A. | Gas phase agglomeration |
| B. | Molecular self-assembly |
| C. | Mechanical grinding |
| D. | Molecular beam epitaxy |
| Answer» D. Molecular beam epitaxy | |