Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Electricity
249 practice questions
Topics covered
Practice questions
111–120 of 127 · Normal
Question 111
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.
Question 112
4 marks · Normal
Answer and see the solution →(a)[2 marks]Describe a possible experiment to show that static electricity can cause a spark.
(b)[2 marks]State a safety precaution you would take when performing this experiment.
Question 113
2 marks · Normal
Answer and see the solution →Some factories use metal pipes to transport flammable powders. Explain why these pipes must be earthed.
Question 114
1 mark · Normal
Answer and see the solution →Which one of these actions helps prevent fires during the transfer of petrol at petrol stations?
- A.Using plastic fuel hoses to avoid shocks
- B.Switching off the pump before filling
- C.Earthing the fuel tanker
- D.Wearing rubber gloves
Question 115
2 marks · Normal
Answer and see the solution →Explain why you might receive a small electric shock after getting out of a car on a dry day.
Question 116
2 marks · Normal
Answer and check →A student rubs a balloon on their hair and the balloon sticks to a wall. Which statement best explains this?
- A.The wall becomes positively charged and attracts the negatively charged balloon.
- B.Electrons move from the balloon to the wall, so both have the same charge.
- C.The wall loses protons to the balloon, making the balloon positive.
- D.The balloon becomes positively charged and is repelled by the wall.
Question 117
6 marks · Normal
Answer and see the solution →A student investigates materials for electrostatic paint spraying. She rubs a plastic rod with a woollen cloth, then uses the rod to try to move small pieces of aluminium foil. Next, she describes how electrostatic spraying works to paint car parts efficiently.
(a)[2 marks]Explain, using ideas about electrons, how rubbing the rod with the cloth causes them to become charged.
(b)[2 marks]The student finds the aluminium foil is attracted to the charged rod. State whether the foil must be charged or uncharged, and explain your answer.
(c)[2 marks]Describe how electrostatic paint spraying makes painting more efficient than using an ordinary spray.
Question 118
5 marks · Normal
Answer and see the solution →A science class uses plastic drinking straws to investigate static forces. First, they identify which straw materials are conductors and which are insulators. Then, they compare how a charged straw interacts with both an uncharged straw and a suspended, previously-rubbed straw.
(a)[2 marks]Describe how you could use a simple circuit with a bulb to determine whether a straw is an electrical conductor or an insulator.
(b)[1 mark]The students suspend an uncharged plastic straw and bring a second, charged plastic straw near it. What will happen? Explain your answer.
(c)[2 marks]Next, both straws are rubbed with the same cloth so they gain the same charge. Predict and explain the observation when one is brought close to the other.
Question 119
5 marks · Normal
Answer and see the solution →Static electricity can be helpful but also dangerous. Consider the uses and dangers of static charges in everyday life.
(a)[2 marks]Explain why fuel tankers are earthed before transferring fuel.
(b)[3 marks]Give two different situations where static electricity is used to solve a practical problem. For each, briefly explain how static charges are involved.
Question 120
6 marks · Normal
Answer and see the solution →A lamp is connected to the mains supply in a household circuit. The lamp has a power rating of 60 W and operates at 240 V.
(a)[2 marks]State the SI units for power, voltage, and current.
(b)[2 marks]Calculate the current flowing through the lamp when it is operating at its rated power.
(c)[2 marks]Explain how the use of a fuse in the plug protects the lamp and the user if a fault occurs.