MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
You want to demonstrate the phenomenon of diffusion to a group of school kids using two coloured gases. For this, you need to slow down the process. Which of the following tricks will help you achieve this feat? |
| A. | Cooling the gases |
| B. | Using gases of large molecular weights |
| C. | Decreasing the size of orifice |
| D. | All of the mentioned |
| Answer» E. | |
| 2. |
Carburisation is a heat treatment used for case hardening steels. Carbon is trapped on steel surface by: |
| A. | Osmosis |
| B. | Interstitial diffusion |
| C. | Vacancy diffusion |
| D. | None of the mentioned |
| Answer» C. Vacancy diffusion | |
| 3. |
CARBURISATION_IS_A_HEAT_TREATMENT_USED_FOR_CASE_HARDENING_STEELS._CARBON_IS_TRAPPED_ON_STEEL_SURFACE_BY:?$ |
| A. | Osmosis |
| B. | Interstitial diffusion |
| C. | Vacancy diffusion |
| D. | None of the mentioned |
| Answer» C. Vacancy diffusion | |
| 4. |
You_want_to_demonstrate_the_phenomenon_of_diffusion_to_a_group_of_school_kids_using_two_coloured_gases._For_this,_you_need_to_slow_down_the_process._Which_of_the_following_tricks_will_help_you_achieve_this_feat?$ |
| A. | Cooling the gases |
| B. | Using gases of larger molecular radii |
| C. | Decreasing the size of orifice |
| D. | All of the mentioned |
| Answer» B. Using gases of larger molecular radii | |
| 5. |
Diffusion is not used in which of the following? |
| A. | Doping of semiconductors |
| B. | Manufacturing of alloys |
| C. | Heat treatment of metals |
| D. | Catalysis |
| Answer» C. Heat treatment of metals | |
| 6. |
Rate of solid-state diffusion does not depend on which of the following? |
| A. | Temperature |
| B. | Diffusing species |
| C. | Host solid |
| D. | Gravity |
| Answer» E. | |
| 7. |
Osmosis is different from diffusion as: |
| A. | Diffusion requires semi-permeable membrane |
| B. | Osmosis requires a liquid solvent |
| C. | Osmosis is a form of active transport |
| D. | In osmosis, solute moves from lower concentration to higher |
| Answer» C. Osmosis is a form of active transport | |
| 8. |
Generally, the metal-to-metal diffusion takes place by vacancy diffusion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
As the temperature rises, the rate of vacancy diffusion in metals: |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | may increase or decrease |
| Answer» B. decreases | |
| 10. |
Interstitial diffusion is generally faster than diffusion by vacancy mode. This is because: |
| A. | Number of interstitial sites is greater than vacancies |
| B. | Vacancy diffusion requires more energy than interstitial diffusion |
| C. | Interstitial species are smaller than substitution species |
| D. | All of the mentioned |
| Answer» E. | |
| 11. |
Concentration gradient refers to: |
| A. | Change of concentration with respect to time |
| B. | Change of concentration with respect to space |
| C. | Change of concentration with respect to temperature |
| D. | None of the mentioned |
| Answer» C. Change of concentration with respect to temperature | |
| 12. |
Diffusion is the result of: |
| A. | Random motion of particles |
| B. | Concentration gradient |
| C. | Kinetic energy of particles |
| D. | All of the mentioned |
| Answer» E. | |