MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Cork is a good insulator because |
| A. | It is flexible |
| B. | It can be powdered |
| C. | Low density |
| D. | It is porous |
| Answer» E. | |
| 2. |
CHOOSE_THE_FALSE_STATEMENT?$ |
| A. | For pure metal thermal conductivity is more |
| B. | Thermal conductivity decreases with increase in the density of the substance |
| C. | Thermal conductivity of dry material is lower than that of damp material |
| D. | Heat treatment causes variation in thermal conductivity |
| Answer» C. Thermal conductivity of dry material is lower than that of damp material | |
| 3. |
Cork is a good insulator becaus? |
| A. | It is flexible |
| B. | It can be powdered |
| C. | Low density |
| D. | It is porous |
| Answer» E. | |
| 4. |
The heat energy propagation due to conduction heat transfer will be minimum for |
| A. | Lead |
| B. | Water |
| C. | Air |
| D. | Copper |
| Answer» D. Copper | |
| 5. |
Heat conduction in gases is due to |
| A. | Elastic impact of molecules |
| B. | Movement of electrons |
| C. | EM Waves |
| D. | Mixing of gases |
| Answer» B. Movement of electrons | |
| 6. |
Most metals are good conductor of heat because of |
| A. | Transport of energy |
| B. | Free electrons and frequent collision of atoms |
| C. | Lattice defects |
| D. | Capacity to absorb energy |
| Answer» C. Lattice defects | |
| 7. |
Identify the very good insulator |
| A. | Saw dust |
| B. | Cork |
| C. | Asbestos sheet |
| D. | Glass wool |
| Answer» E. | |
| 8. |
The average thermal conductivities of water and air conform to the ratio |
| A. | 50:1 |
| B. | 25:1 |
| C. | 5:1 |
| D. | 15:1 |
| Answer» C. 5:1 | |
| 9. |
Which one of the following forms of water have the highest value of thermal conductivity? |
| A. | Boiling water |
| B. | Steam |
| C. | Solid ice |
| D. | Melting ice |
| Answer» D. Melting ice | |
| 10. |
Mark the matter with least value of thermal conductivity |
| A. | Air |
| B. | Water |
| C. | Ash |
| D. | Window glass |
| Answer» B. Water | |
| 11. |
Thermal conductivity is defined as the heat flow per unit time |
| A. | When the temperature gradient is unity |
| B. | Across the wall with no temperature |
| C. | Through a unit thickness of the wall |
| D. | Across unit area where the temperature gradient is unity |
| Answer» E. | |