Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Electric Charge
74 practice questions
Topics covered
Practice questions
21–30 of 38 · Normal
Question 21
2 marks · Normal
Answer and see the solution →State and explain one reason why electrostatic spraying reduces waste compared to ordinary spraying.
Question 22
1 mark · Normal
Answer and check →Which statement best describes how static electricity helps electrostatic paint spraying?
- A.Paint droplets get a charge so they are attracted to the oppositely charged object.
- B.Paint is made magnetic to stick better.
- C.The object is heated to attract the paint.
- D.A fan spreads paint evenly on the surface.
Question 23
2 marks · Normal
Answer and see the solution →Explain why paint droplets from an electrostatic spray gun spread out from each other as they leave the nozzle.
Question 24
4 marks · Normal
Answer and see the solution →In a factory, car doors are painted using electrostatic spraying.
(a)[2 marks]Describe how charges are arranged in the spray gun and on the car door during the process.
(b)[2 marks]Explain, using physics ideas, how electrostatic spraying improves the efficiency of painting compared to uncharged methods.
Question 25
3 marks · Normal
Answer and see the solution →Describe, using ideas about static electricity, how static charges are used in photocopiers.
Question 26
4 marks · Normal
Answer and see the solution →A conveyor belt moves grains past a metal plate. The grains rub the belt and become charged.
(a)[2 marks]Describe what happens if the grains are negatively charged and the metal plate is earthed.
(b)[2 marks]Explain how static electricity can be used to separate the grains from unwanted materials (chaff) using a charged conveyor and earthed plate.
Question 27
2 marks · Normal
Answer and see the solution →Explain why fuel tankers must be earthed before transferring fuel.
Question 28
2 marks · Normal
Answer and see the solution →A worker is repairing computer equipment. Explain why the worker must avoid wearing clothes made entirely from synthetic materials.
Question 29
3 marks · Normal
Answer and see the solution →Describe two dangers of static electricity in everyday life and how each can be reduced or prevented.
Question 30
4 marks · Normal
Answer and see the solution →(a)[2 marks]Aircraft are always earthed after landing. Explain why this is necessary.
(b)[2 marks]Suggest and describe a method by which the aircraft can be safely earthed after landing.