CIE iGCSE Co-Ordinated Science P2.3.1 Conduction Exam Style Questions Paper 1
Question
There is a vacuum between the double walls of a vacuum flask. Which of the methods of thermal energy transfer are prevented by the vacuum?
A. Conduction only
B. Conduction and convection
C. Convection only
D. Radiation only
▶️Answer/Explanation
Answer: B
Explanation: A vacuum prevents both conduction and convection because there are no particles to transfer heat. However, radiation can still occur through a vacuum.
Question
Which row shows a good thermal conductor and a bad thermal conductor?
| Option | Good Conductor | Bad Conductor |
|---|---|---|
| A | copper | air |
| B | copper | silver |
| C | water | air |
| D | water | silver |
▶️Answer/Explanation
Answer: A
Explanation: Copper is a good thermal conductor, while air is a poor thermal conductor (insulator).
Question
Four rods have the same dimensions. They are made of four different metals and are all at room temperature. All the rods are heated equally at one end for the same length of time. The final temperature of the other end of each rod is shown in the table. Which rod is the worst conductor of heat?
| Rod | Final Temperature (°C) |
|---|---|
| A | 50 |
| B | 62 |
| C | 70 |
| D | 82 |
▶️Answer/Explanation
Answer: A. 50
Explanation: The rod with the lowest final temperature (50°C) is the worst conductor of heat because less heat has been transferred to the other end.
Question
Water in a metal pan is heated on a gas burner. What are the main methods by which heat is transferred through the metal pan to the water and throughout the water?
A conduction through the metal pan and convection in the water
B convection through the metal pan and conduction in the water
C convection through the metal pan and radiation in the water
D radiation through the metal pan and conduction in the water
▶️Answer/Explanation
Answer: A conduction through the metal pan and convection in the water
Explanation: Heat is transferred through the metal pan by conduction, as the metal is a good conductor of heat. Once the heat reaches the water, it is distributed throughout the water by convection currents.