Combined Science (A) J250,12 Higher November 2020, OCR GCSE Past Papers with Mark Schemes

1. Forces and Motion – Braking force effects on passengers, human reaction time values, thinking distance proportionality to speed, and energy transfers in braking.

2. Electromagnetic Waves and Energy Transfer – Uses of EM waves, wave refraction in different media, efficiency improvements in energy transfers, and gamma radiation shielding.

3. Radioactivity and Half-Life – Carbon-14 decay equation, beta radiation emission, isotopic mass and charge changes, and radiocarbon dating calculations.

4. Waves and Sound Propagation – Sound vs. light wave differences, water wave motion effects on floating objects, and frequency and speed calculations from oscilloscope data.

5. Electricity and Power Distribution – National grid power loss calculations, transformer efficiency explanations, and dangers of electrical sockets near water.

6. Wind vs. Tidal Energy – Comparing efficiency, kinetic energy calculations for moving air and water, and advantages and disadvantages of each renewable energy source.