Combined Science (A) J250,12 Higher June 2023, OCR GCSE Past Papers with Mark Schemes

1. Electricity and Energy Transfer – Conservation of energy principles, transformer roles in the national grid, plug wiring functions, and energy transfer in braking.

2. Forces and Motion – Braking distances at different speeds, Hooke’s Law and energy storage in springs, and wave behavior in atmospheric layers.

3. Radioactivity and Nuclear Physics – Effects of radiation exposure, nuclear equations for alpha decay, and differences between contamination and irradiation.

4. Electromagnetic Waves and Power Usage – Frequency ranges of EM waves, microwave oven energy calculations, and efficiency in national grid electricity supply.

5. Acceleration and Vehicle Motion – Graph-based acceleration determination, estimating motorway vs. town driving speeds, and impact of alcohol on reaction times.

6. Half-life and Sound Wave Experiments – Determining half-life from decay graphs, calculating sound speed using tuning forks, and systematic errors in sound wave measurements.