CIE iGCSE Co-Ordinated Science P2.3.4 Consequences of thermal energy transfer Exam Style Questions Paper 2
▶️ Answer/Explanation
A vacuum contains no particles, so it cannot transfer heat by conduction or convection, both of which need a medium.
The shiny, silvered surfaces are poor absorbers/emitters of infrared radiation, so they specifically reduce heat loss by radiation only.
Combining these two effects means the vacuum blocks conduction and convection, while the shiny surfaces block radiation.
✅ Answer: (B)
The shiny, silvered surfaces are poor absorbers/emitters of infrared radiation, so they specifically reduce heat loss by radiation only.
Combining these two effects means the vacuum blocks conduction and convection, while the shiny surfaces block radiation.
✅ Answer: (B)
Question
Two methods of cooking are grilling under a red-hot heater and frying in a shallow metal pan.
How does thermal energy pass through the air to reach the food in method 1 and how does thermal energy pass through the bottom of the metal pan in method 2?
▶️Answer/Explanation
Ans : C
Question
Which colour of outer clothing helps to keep the wearer cool on a hot, sunny day, and why is this clothing effective?
| Colour of Clothing | Why It Is Effective |
|---|---|
| A. black | it is a good absorber of radiation from the Sun |
| B. black | it is a poor absorber of radiation from the Sun |
| C. white | it is a good absorber of radiation from the Sun |
| D. white | it is a poor absorber of radiation from the Sun |
▶️Answer/Explanation
Answer: D
Explanation: White clothing reflects most of the Sun’s radiation, making it a poor absorber of heat. This helps keep the wearer cool on a hot, sunny day.