Question 5
FA student investigates how effective different materials are as thermal insulators. Figure shows the apparatus.
Figure: The apparatus used to investigate the effectiveness of a material as a thermal insulator
The student pours 200 cm3 of hot water into the beaker and records the temperature of the water. The student records the temperature again after 20 minutes. The student repeats the investigation with four different insulating materials of the same thickness. Table shows the results.
Table: The starting temperature of the water and the temperature of the water after 20 minutes for each insulating material
| Material | Starting temperature in ∘C^\circ\text{C}∘C | Temperature after 20 minutes in ∘C^\circ\text{C}∘C |
|---|---|---|
| P | 80 | 54 |
| Q | 80 | 69 |
| R | 80 | 46 |
| S | 80 | 61 |
a.[1]
Determine the temperature drop of the water for material Q. Use Table.
b.[1]
Give the material that is the most effective thermal insulator. Use Table.
c.[1]
Give one variable that the student controlled in this investigation.
d.[2]
Explain why the student puts a lid on the beaker.
1.2 Conservation and dissipation of energy Questions
40 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.