A student uses an electric heater and a joulemeter to find the specific heat capacity of a metal block.
The value the student calculates is higher than the true value.
Which change to the method would give a more accurate value?
Repeat the experiment three times and calculate a mean value
Use a thermometer that can measure a larger range of temperatures
Record the starting temperature after switching on the heater
Wrap the block in a layer of insulation before switching on the heater
44 exam-style questions on OCR GCSE Physics 1.2 Changes of state, covering 1.2.1 Conservation of mass during changes of state, 1.2.2 Physical and chemical changes, 1.2.3 Heating, temperature and changes of state, 1.2.4 Specific heat capacity and specific latent heat, 1.2.5 Internal energy and temperature change, and 1.2.6 Energy transfer during a change of state. Each one has a worked solution and a mark scheme showing where the marks go.