⚡ Show all working — the AI marks against the AQA mark scheme. Method marks awarded for correct working even if the final answer is wrong.
1 markCharging by frictionAQA 8463 style
When a plastic rod is rubbed with a cloth, the rod becomes negatively charged. What has happened?
A Protons have moved from the cloth to the rod
B Electrons have moved from the cloth to the rod
C Neutrons have moved between the rod and cloth
D The rod has created new negative charges by friction
3 marksElectrostatic precipitatorAQA 8463 style
Explain how an electrostatic precipitator removes soot particles from chimney gases. (3 marks)
Hint: Stage 1: particles are charged by the wire. Stage 2: charged particles attracted to plates. Stage 3: particles collected on plates and removed.
+30 XP
1 markUse of staticAQA 8463 style
Why are car bodies earthed during spray painting?
A To prevent the paint from becoming too thick
B So that the charged paint droplets are attracted to the car body — giving an even coat with less waste
C To prevent the car body from becoming magnetised during painting
D To ensure the paint dries faster
3 marksRefuelling hazardAQA 8463 style
Explain why aircraft are earthed with a metal bonding wire before refuelling, and what would happen without it. (3 marks)
Hint: Why charge builds up (friction with air). What the hazard is (spark could ignite fuel). How the wire prevents it (provides discharge path to earth).